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Aircraft engine

January 21, 2023

"Aero-engine" redirects here. For the use of aircraft engines in cars, see Aero-engined car.

An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many small UAVs have used electric motors.

A Rolls-Royce Merlin installed in a preserved Avro York

Manufacturing industry

See also: List of aircraft engines

In commercial aviation the major Western manufacturers of turbofan engines are Pratt & Whitney (a subsidiary of Raytheon Technologies), General Electric, Rolls-Royce, and CFM International (a joint venture of Safran Aircraft Engines and General Electric). Russian manufacturers include the United Engine Corporation, Aviadvigatel and Klimov. Aeroengine Corporation of China was formed in 2016 with the merger of several smaller companies.[1]

The largest manufacturer of turboprop engines for general aviation is Pratt & Whitney.[2] General Electric announced in 2015 entrance into the market.[2]

Development history

 
Wright vertical 4-cylinder engine
See also: Timeline of jet power

Shaft engines

Reciprocating (piston) engines

Main article: reciprocating engine

In-line engine

Main article: Straight engine
 
Ranger L-440 air-cooled, six-cylinder, inverted, in-line engine used in Fairchild PT-19

In this entry, for clarity, the term "inline engine" refers only to engines with a single row of cylinders, as used in automotive language, but in aviation terms, the phrase "inline engine" also covers V-type and opposed engines (as described below), and is not limited to engines with a single row of cylinders. This is typically to differentiate them from radial engines. A straight engine typically has an even number of cylinders, but there are instances of three- and five-cylinder engines. The greatest advantage of an inline engine is that it allows the aircraft to be designed with a low frontal area to minimize drag. If the engine crankshaft is located above the cylinders, it is called an inverted inline engine: this allows the propeller to be mounted high up to increase ground clearance, enabling shorter landing gear. The disadvantages of an inline engine include a poor power-to-weight ratio, because the crankcase and crankshaft are long and thus heavy. An in-line engine may be either air-cooled or liquid-cooled, but liquid-cooling is more common because it is difficult to get enough air-flow to cool the rear cylinders directly. Inline engines were common in early aircraft; one was used in the Wright Flyer, the aircraft that made the first controlled powered flight. However, the inherent disadvantages of the design soon became apparent, and the inline design was abandoned, becoming a rarity in modern aviation.

For other configurations of aviation inline engine, such as X-engines, U-engines, H-engines, etc., see Inline engine (aeronautics).

V-type engine

 
A Rolls-Royce Merlin V-12 Engine
Main article: V engine

Cylinders in this engine are arranged in two in-line banks, typically tilted 60–90 degrees apart from each other and driving a common crankshaft. The vast majority of V engines are water-cooled. The V design provides a higher power-to-weight ratio than an inline engine, while still providing a small frontal area. Perhaps the most famous example of this design is the legendary Rolls-Royce Merlin engine, a 27-litre (1649 in3) 60° V12 engine used in, among others, the Spitfires that played a major role in the Battle of Britain.

Horizontally opposed engine

Main article: Flat engine
 
A ULPower UL260i horizontally opposed air-cooled aero engine

A horizontally opposed engine, also called a flat or boxer engine, has two banks of cylinders on opposite sides of a centrally located crankcase. The engine is either air-cooled or liquid-cooled, but air-cooled versions predominate. Opposed engines are mounted with the crankshaft horizontal in airplanes, but may be mounted with the crankshaft vertical in helicopters. Due to the cylinder layout, reciprocating forces tend to cancel, resulting in a smooth running engine. Opposed-type engines have high power-to-weight ratios because they have a comparatively small, lightweight crankcase. In addition, the compact cylinder arrangement reduces the engine's frontal area and allows a streamlined installation that minimizes aerodynamic drag. These engines always have an even number of cylinders, since a cylinder on one side of the crankcase “opposes” a cylinder on the other side.

Opposed, air-cooled four- and six-cylinder piston engines are by far the most common engines used in small general aviation aircraft requiring up to 400 horsepower (300 kW) per engine. Aircraft that require more than 400 horsepower (300 kW) per engine tend to be powered by turbine engines.

H configuration engine

Main article: H engine

An H configuration engine is essentially a pair of horizontally opposed engines placed together, with the two crankshafts geared together.

Radial engine

Main article: Radial engine

This type of engine has one or more rows of cylinders arranged around a centrally located crankcase. Each row generally has an odd number of cylinders to produce smooth operation. A radial engine has only one crank throw per row and a relatively small crankcase, resulting in a favorable power-to-weight ratio. Because the cylinder arrangement exposes a large amount of the engine's heat-radiating surfaces to the air and tends to cancel reciprocating forces, radials tend to cool evenly and run smoothly. The lower cylinders, which are under the crankcase, may collect oil when the engine has been stopped for an extended period. If this oil is not cleared from the cylinders prior to starting the engine, serious damage due to hydrostatic lock may occur.

Most radial engines have the cylinders arranged evenly around the crankshaft, although some early engines, sometimes called semi-radials or fan configuration engines, had an uneven arrangement. The best known engine of this type is the Anzani engine, which was fitted to the Bleriot XI used for the first flight across the English Channel in 1909. This arrangement had the drawback of needing a heavy counterbalance for the crankshaft, but was used to avoid the spark plugs oiling up.

In military aircraft designs, the large frontal area of the engine acted as an extra layer of armor for the pilot. Also air-cooled engines, without vulnerable radiators, are slightly less prone to battle damage, and on occasion would continue running even with one or more cylinders shot away. However, the large frontal area also resulted in an aircraft with an aerodynamically inefficient increased frontal area.

Rotary engine

 
Le Rhone 9C rotary aircraft engine
Main article: Rotary engine

Rotary engines have the cylinders in a circle around the crankcase, as in a radial engine, (see above), but the crankshaft is fixed to the airframe and the propeller is fixed to the engine case, so that the crankcase and cylinders rotate. The advantage of this arrangement is that a satisfactory flow of cooling air is maintained even at low airspeeds, retaining the weight advantage and simplicity of a conventional air-cooled engine without one of their major drawbacks. The first practical rotary engine was the Gnome Omega designed by the Seguin brothers and first flown in 1909. Its relative reliability and good power to weight ratio changed aviation dramatically. [12] Before the first World War most speed records were gained using Gnome-engined aircraft, and in the early years of the war rotary engines were dominant in aircraft types for which speed and agility were paramount. To increase power, engines with two rows of cylinders were built.

However, the gyroscopic effects of the heavy rotating engine produced handling problems in aircraft and the engines also consumed large amounts of oil since they used total loss lubrication, the oil being mixed with the fuel and ejected with the exhaust gases. Castor oil was used for lubrication, since it is not soluble in petrol, and the resultant fumes were nauseating to the pilots. Engine designers had always been aware of the many limitations of the rotary engine so when the static style engines became more reliable and gave better specific weights and fuel consumption, the days of the rotary engine were numbered.

Wankel engine

Main article: Wankel engine
 
Powerplant from a Schleicher ASH 26e self-launching motor glider, removed from the glider and mounted on a test stand for maintenance at the Alexander Schleicher GmbH & Co in Poppenhausen, Germany. Counter-clockwise from top left: propeller hub, mast with belt guide, radiator, Wankel engine, muffler shroud.

The Wankel is a type of rotary engine. The Wankel engine is about one half the weight and size of a traditional four-stroke cycle piston engine of equal power output, and much lower in complexity. In an aircraft application, the power-to-weight ratio is very important, making the Wankel engine a good choice. Because the engine is typically constructed with an aluminium housing and a steel rotor, and aluminium expands more than steel when heated, a Wankel engine does not seize when overheated, unlike a piston engine. This is an important safety factor for aeronautical use. Considerable development of these designs started after World War II, but at the time the aircraft industry favored the use of turbine engines. It was believed that turbojet or turboprop engines could power all aircraft, from the largest to smallest designs. The Wankel engine did not find many applications in aircraft, but was used by Mazda in a popular line of sports cars. The French company Citroën had developed Wankel powered RE-2 [fr] helicopter in 1970's.[13]

In modern times the Wankel engine has been used in motor gliders where the compactness, light weight, and smoothness are crucially important.[14]

The now-defunct Staverton-based firm MidWest designed and produced single- and twin-rotor aero engines, the MidWest AE series. These engines were developed from the motor in the Norton Classic motorcycle. The twin-rotor version was fitted into ARV Super2s and the Rutan Quickie. The single-rotor engine was put into a Chevvron motor glider and into the Schleicher ASH motor-gliders. After the demise of MidWest, all rights were sold to Diamond of Austria, who have since developed a MkII version of the engine.

As a cost-effective alternative to certified aircraft engines some Wankel engines, removed from automobiles and converted to aviation use, have been fitted in homebuilt experimental aircraft. Mazda units with outputs ranging from 100 horsepower (75 kW) to 300 horsepower (220 kW) can be a fraction of the cost of traditional engines. Such conversions first took place in the early 1970s;[citation needed] and as of 10 December 2006 the National Transportation Safety Board has only seven reports of incidents involving aircraft with Mazda engines, and none of these is of a failure due to design or manufacturing flaws.

Combustion cycles

The most common combustion cycle for aero engines is the four-stroke with spark ignition. Two-stroke spark ignition has also been used for small engines, while the compression-ignition Diesel engine is seldom used.

Starting in the 1930s attempts were made to produce a practical aircraft diesel engine. In general, Diesel engines are more reliable and much better suited to running for long periods of time at medium power settings. The lightweight alloys of the 1930s were not up to the task of handling the much higher compression ratios of diesel engines, so they generally had poor power-to-weight ratios and were uncommon for that reason, although the Clerget 14F Diesel radial engine (1939) has the same power to weight ratio as a gasoline radial. Improvements in Diesel technology in automobiles (leading to much better power-weight ratios), the Diesel's much better fuel efficiency and the high relative taxation of AVGAS compared to Jet A1 in Europe have all seen a revival of interest in the use of diesels for aircraft. Thielert Aircraft Engines converted Mercedes Diesel automotive engines, certified them for aircraft use, and became an OEM provider to Diamond Aviation for their light twin. Financial problems have plagued Thielert, so Diamond's affiliate — Austro Engine — developed the new AE300 turbodiesel, also based on a Mercedes engine.[15] Competing new Diesel engines may bring fuel efficiency and lead-free emissions to small aircraft, representing the biggest change in light aircraft engines in decades.

Power turbines

Turboprop

 
Cutaway view of a Garrett TPE-331 turboprop engine showing the gearbox at the front of the engine
Main article: Turboprop

While military fighters require very high speeds, many civil airplanes do not. Yet, civil aircraft designers wanted to benefit from the high power and low maintenance that a gas turbine engine offered. Thus was born the idea to mate a turbine engine to a traditional propeller. Because gas turbines optimally spin at high speed, a turboprop features a gearbox to lower the speed of the shaft so that the propeller tips don't reach supersonic speeds. Often the turbines that drive the propeller are separate from the rest of the rotating components so that they can rotate at their own best speed (referred to as a free-turbine engine). A turboprop is very efficient when operated within the realm of cruise speeds it was designed for, which is typically 200 to 400 mph (320 to 640 km/h).

Turboshaft

 
An Allison Model 250 turboshaft engine common to many types of helicopters
Main article: Turboshaft

Turboshaft engines are used primarily for helicopters and auxiliary power units. A turboshaft engine is similar to a turboprop in principle, but in a turboprop the propeller is supported by the engine and the engine is bolted to the airframe: in a turboshaft, the engine does not provide any direct physical support to the helicopter's rotors. The rotor is connected to a transmission which is bolted to the airframe, and the turboshaft engine drives the transmission. The distinction is seen by some as slim, as in some cases aircraft companies make both turboprop and turboshaft engines based on the same design.

Electric power

A number of electrically powered aircraft, such as the QinetiQ Zephyr, have been designed since the 1960s.[16][17] Some are used as military drones.[18] In France in late 2007, a conventional light aircraft powered by an 18 kW electric motor using lithium polymer batteries was flown, covering more than 50 kilometers (31 mi), the first electric airplane to receive a certificate of airworthiness.[16]

On 18 May 2020, the Pipistrel E-811 was the first electric aircraft engine to be awarded a type certificate by EASA for use in general aviation. The E-811 powers the Pipistrel Velis Electro.[19][11]

Limited experiments with solar electric propulsion have been performed, notably the manned Solar Challenger and Solar Impulse and the unmanned NASA Pathfinder aircraft.

Many big companies, such as Siemens, are developing high performance electric engines for aircraft use, also, SAE shows new developments in elements as pure Copper core electric motors with a better efficiency. A hybrid system as emergency back-up and for added power in take-off is offered for sale by Axter Aerospace, Madrid, Spain. [1]

Small multicopter UAVs are almost always powered by electric motors.

Reaction engines

Main article: Jet engine

Reaction engines generate the thrust to propel an aircraft by ejecting the exhaust gases at high velocity from the engine, the resultant reaction of forces driving the aircraft forwards. The most common reaction propulsion engines flown are turbojets, turbofans and rockets. Other types such as pulsejets, ramjets, scramjets and pulse detonation engines have also flown. In jet engines the oxygen necessary for fuel combustion comes from the air, while rockets carry oxygen in some form as part of the fuel load, permitting their use in space.

Jet turbines

Turbojet

 
A General Electric J85-GE-17A turbojet engine. This cutaway clearly shows the 8 stages of axial compressor at the front (left side of the picture), the combustion chambers in the middle, and the two stages of turbines at the rear of the engine.
Main article: Turbojet

A turbojet is a type of gas turbine engine that was originally developed for military fighters during World War II. A turbojet is the simplest of all aircraft gas turbines. It consists of a compressor to draw air in and compress it, a combustion section where fuel is added and ignited, one or more turbines that extract power from the expanding exhaust gases to drive the compressor, and an exhaust nozzle that accelerates the exhaust gases out the back of the engine to create thrust. When turbojets were introduced, the top speed of fighter aircraft equipped with them was at least 100 miles per hour faster than competing piston-driven aircraft. In the years after the war, the drawbacks of the turbojet gradually became apparent. Below about Mach 2, turbojets are very fuel inefficient and create tremendous amounts of noise. Early designs also respond very slowly to power changes, a fact that killed many experienced pilots when they attempted the transition to jets. These drawbacks eventually led to the downfall of the pure turbojet, and only a handful of types are still in production. The last airliner that used turbojets was the Concorde, whose Mach 2 airspeed permitted the engine to be highly efficient.

Turbofan

 
A cutaway of a CFM56-3 turbofan engine
Main article: Turbofan

A turbofan engine is much the same as a turbojet, but with an enlarged fan at the front that provides thrust in much the same way as a ducted propeller, resulting in improved fuel efficiency. Though the fan creates thrust like a propeller, the surrounding duct frees it from many of the restrictions that limit propeller performance. This operation is a more efficient way to provide thrust than simply using the jet nozzle alone, and turbofans are more efficient than propellers in the transsonic range of aircraft speeds and can operate in the supersonic realm. A turbofan typically has extra turbine stages to turn the fan. Turbofans were among the first engines to use multiple spools—concentric shafts that are free to rotate at their own speed—to let the engine react more quickly to changing power requirements. Turbofans are coarsely split into low-bypass and high-bypass categories. Bypass air flows through the fan, but around the jet core, not mixing with fuel and burning. The ratio of this air to the amount of air flowing through the engine core is the bypass ratio. Low-bypass engines are preferred for military applications such as fighters due to high thrust-to-weight ratio, while high-bypass engines are preferred for civil use for good fuel efficiency and low noise. High-bypass turbofans are usually most efficient when the aircraft is traveling at 500 to 550 miles per hour (800 to 885 km/h), the cruise speed of most large airliners. Low-bypass turbofans can reach supersonic speeds, though normally only when fitted with afterburners.

Pulse jets

Main article: Pulsejet

Pulse jets are mechanically simple devices that—in a repeating cycle—draw air through a no-return valve at the front of the engine into a combustion chamber and ignite it. The combustion forces the exhaust gases out the back of the engine. It produces power as a series of pulses rather than as a steady output, hence the name. The only application of this type of engine was the German unmanned V1 flying bomb of World War II. Though the same engines were also used experimentally for ersatz fighter aircraft, the extremely loud noise generated by the engines caused mechanical damage to the airframe that was sufficient to make the idea unworkable.

Rocket

 
An XLR99
Main article: Rocket engine

A few aircraft have used rocket engines for main thrust or attitude control, notably the Bell X-1 and North American X-15. Rocket engines are not used for most aircraft as the energy and propellant efficiency is very poor, but have been employed for short bursts of speed and takeoff. Where fuel/propellant efficiency is of lesser concern, rocket engines can be useful because they produce very large amounts of thrust and weigh very little.

Precooled jet engines

Main article: Precooled jet engine

For very high supersonic/low hypersonic flight speeds, inserting a cooling system into the air duct of a hydrogen jet engine permits greater fuel injection at high speed and obviates the need for the duct to be made of refractory or actively cooled materials. This greatly improves the thrust/weight ratio of the engine at high speed.

It is thought that this design of engine could permit sufficient performance for antipodal flight at Mach 5, or even permit a single stage to orbit vehicle to be practical. The hybrid air-breathing SABRE rocket engine is a pre-cooled engine under development.

Piston-turbofan hybrid

At the April 2018 ILA Berlin Air Show, Munich-based research institute de:Bauhaus Luftfahrt presented a high-efficiency composite cycle engine for 2050, combining a geared turbofan with a piston engine core. The 2.87 m diameter, 16-blade fan gives a 33.7 ultra-high bypass ratio, driven by a geared low-pressure turbine but the high-pressure compressor drive comes from a piston-engine with two 10 piston banks without a high-pressure turbine, increasing efficiency with non-stationary isochoric-isobaric combustion for higher peak pressures and temperatures. The 11,200 lb (49.7 kN) engine could power a 50-seat regional jet.[20]

Its cruise TSFC would be 11.5 g/kN/s (0.406 lb/lbf/hr) for an overall engine efficiency of 48.2%, for a burner temperature of 1,700 K (1,430 °C), an overall pressure ratio of 38 and a peak pressure of 30 MPa (300 bar).[21] Although engine weight increases by 30%, aircraft fuel consumption is reduced by 15%.[22] Sponsored by the European Commission under Framework 7 project LEMCOTEC, Bauhaus Luftfahrt, MTU Aero Engines and GKN Aerospace presented the concept in 2015, raising the overall engine pressure ratio to over 100 for a 15.2% fuel burn reduction compared to 2025 engines.[23]

Engine position numbering

 
The thrust levers of a three-engine Boeing 727, each one bearing the respective engine number

On multi-engine aircraft, engine positions are numbered from left to right from the point of view of the pilot looking forward, so for example on a four-engine aircraft such as the Boeing 747, engine No. 1 is on the left side, farthest from the fuselage, while engine No. 3 is on the right side nearest to the fuselage.[24]

In the case of the twin-engine English Electric Lightning, which has two fuselage-mounted jet engines one above the other, engine No. 1 is below and to the front of engine No. 2, which is above and behind.[25]

In the Cessna 337 Skymaster, a push-pull twin-engine airplane, engine No. 1 is the one at the front of the fuselage, while engine No. 2 is aft of the cabin.

Fuel

Aircraft reciprocating (piston) engines are typically designed to run on aviation gasoline. Avgas has a higher octane rating than automotive gasoline to allow higher compression ratios, power output, and efficiency at higher altitudes. Currently the most common Avgas is 100LL. This refers to the octane rating (100 octane) and the lead content (LL = low lead, relative to the historic levels of lead in pre-regulation Avgas).[citation needed]

Refineries blend Avgas with tetraethyllead (TEL) to achieve these high octane ratings, a practice that governments no longer permit for gasoline intended for road vehicles. The shrinking supply of TEL and the possibility of environmental legislation banning its use have made a search for replacement fuels for general aviation aircraft a priority for pilots’ organizations.[26]

Turbine engines and aircraft diesel engines burn various grades of jet fuel. Jet fuel is a relatively less volatile petroleum derivative based on kerosene, but certified to strict aviation standards, with additional additives.[citation needed]

Model aircraft typically use nitro engines (also known as "glow engines" due to the use of a glow plug) powered by glow fuel, a mixture of methanol, nitromethane, and lubricant. Electrically powered model airplanes[27] and helicopters are also commercially available. Small multicopter UAVs are almost always powered by electricity,[28][29] but larger gasoline-powered designs are under development.[30][31][32]

See also

Notes

  1. ^ The world's first series-produced cars with superchargers came earlier than aircraft. These were Mercedes 6/25/40 hp and Mercedes 10/40/65 hp, both models introduced in 1921 and used Roots superchargers. G.N. Georgano, ed. (1982). The new encyclopedia of motorcars 1885 to the present (3rd ed.). New York: Dutton. pp. 415. ISBN 978-0-525-93254-3.

References

  1. ^ "China launches state-owned aircraft engine maker". CCTV America. August 29, 2016.
  2. ^ a b "GE Pushes Into Turboprop Engines, Taking on Pratt". Wall Street Journal. November 16, 2015.
  3. ^ a b c Ian McNeil, ed. (1990). Encyclopedia of the History of Technology. London: Routledge. pp. 315–21. ISBN 978-0-203-19211-5.
  4. ^ Gibbs-Smith, Charles Harvard (1970). Aviation: an historical survey from its origins to the end of World War II. London: Her Majesty's Stationery Office. ISBN 9780112900139.
  5. ^ Gibbs-Smith, Charles Harvard (1960). The Aeroplane: An Historical Survey of Its Origins and Development. London: Her Majesty's Stationery Office.
  6. ^ Winter, Frank H. (December 1980). "Ducted Fan or the World's First Jet Plane? The Coanda claim re-examined". The Aeronautical Journal. Royal Aeronautical Society. 84.
  7. ^ Antoniu, Dan; Cicoș, George; Buiu, Ioan-Vasile; Bartoc, Alexandru; Șutic, Robert (2010). Henri Coandă and his technical work during 1906–1918 (in Romanian). Bucharest: Editura Anima. ISBN 978-973-7729-61-3.
  8. ^ Guttman, Jon (2009). SPAD XIII vs. Fokker D VII: Western Front 1918 (1st ed.). Oxford: Osprey. pp. 24–25. ISBN 978-1-84603-432-9.
  9. ^ Powell, Hickman (Jun 1941). "He Harnessed a Tornado..." Popular Science.
  10. ^ Anderson, John D (2002). The airplane: A history of its technology. Reston, VA, USA: American Institute of Aeronautics and Astronautics. pp. 252–53. ISBN 978-1-56347-525-2.
  11. ^ a b Calderwood, Dave (9 July 2020). "Pipistrel offers type certified electric motor". Seager Publishing. FLYER Magazine. Retrieved 18 August 2020.
  12. ^ Gibbs-Smith, C.H. (2003). Aviation. London: NMSO. p. 175. ISBN 1-9007-4752-9.
  13. ^ Boulay, Pierre (1998). Guides Larivière (ed.). Les hélicoptères français (in French). ISBN 978-2-907051-17-0.
  14. ^ . DE: Alexander Schleicher. Archived from the original on 2006-10-08. Retrieved 2006-11-24.
  15. ^ . Flying Mag. Archived from the original on 2014-06-18. Retrieved 2010-06-14.
  16. ^ a b , Association pour la Promotion des Aéronefs à Motorisation Électrique, December 23, 2007, archived from the original on 2008-01-10.
  17. ^ , Physorg.com, archived from the original on 2008-02-23.
  18. ^ , Litemachines, archived from the original on 2009-12-31.
  19. ^ "TCDS for E811 engine, model 268MVLC" (PDF). European Union Aviation Safety Agency. 18 May 2020. Retrieved 18 August 2020.
  20. ^ David Kaminski-Morrow (24 April 2018). "Hybrid geared-fan and piston concept could slash fuel-burn". Flightglobal.
  21. ^ "Composite Cycle Engine concept technical data sheet" (PDF). Bauhaus Luftfahrt.
  22. ^ "The composite cycle engine concept". Bauhaus Luftfahrt.
  23. ^ Sascha Kaiser; et al. (July 2015). "A Composite Cycle Engine Concept with Hecto-Pressure Ratio". AIAA Propulsion and Energy Conference. doi:10.2514/6.2015-4028. ISBN 978-1-62410-321-6.
  24. ^ National Business Aircraft Association (1952). Skyways for business. Henry Publications. p. 52. {{cite book}}: |author= has generic name (help)
  25. ^ . Gatwick Aviation Museum. Archived from the original on 12 June 2018. Retrieved 9 June 2018.
  26. ^ (Press release). Archived from the original on March 3, 2013.
  27. ^ "Electric Airplanes - RTF". www.nitroplanes.com.
  28. ^ "Amazon.com: Photography Drones Store: Buying Guide: Electronics". Amazon.
  29. ^ "RC Quadcopters". www.nitroplanes.com.
  30. ^ "Yeair! hybrid gasoline/electric quadcopter boasts impressive numbers". www.gizmag.com.
  31. ^ "Goliath – A Gas Powered Quadcopter". hackaday.io.
  32. ^ "Heavy Lifting Quadcopter Lifts 50 Pound Loads. It's a Gas Powered HULK (HLQ) – Industry Tap". www.industrytap.com. 2013-03-11.

External links

 
Wikimedia Commons has media related to Aircraft engines.
 
Look up aircraft engine in Wiktionary, the free dictionary.
  • Aircraft Engines and Aircraft Engine Theory (includes links to diagrams)
  • The Aircraft Engine Historical Society
  • Jet Engine Specification Database
  • The History of Aircraft Power Plants Briefly Reviewed : From the " 7 lb. per h.p" Days to the " 1 lb. per h.p" of To-day
  • "The Quest for Power" a 1954 Flight article by Bill Gunston
  • "Engine Directory". Flight International. 24 September 1997.

January 21, 2023
aircraft, engine, aero, engine, redirects, here, aircraft, engines, cars, aero, engined, aircraft, engine, often, referred, aero, engine, power, component, aircraft, propulsion, system, most, aircraft, engines, either, piston, engines, turbines, although, have. Aero engine redirects here For the use of aircraft engines in cars see Aero engined car An aircraft engine often referred to as an aero engine is the power component of an aircraft propulsion system Most aircraft engines are either piston engines or gas turbines although a few have been rocket powered and in recent years many small UAVs have used electric motors A Rolls Royce Merlin installed in a preserved Avro York Contents 1 Manufacturing industry 2 Development history 3 Shaft engines 3 1 Reciprocating piston engines 3 1 1 In line engine 3 1 2 V type engine 3 1 3 Horizontally opposed engine 3 1 4 H configuration engine 3 1 5 Radial engine 3 1 6 Rotary engine 3 1 7 Wankel engine 3 1 8 Combustion cycles 3 2 Power turbines 3 2 1 Turboprop 3 2 2 Turboshaft 3 3 Electric power 4 Reaction engines 4 1 Jet turbines 4 1 1 Turbojet 4 1 2 Turbofan 4 2 Pulse jets 4 3 Rocket 4 4 Precooled jet engines 4 5 Piston turbofan hybrid 5 Engine position numbering 6 Fuel 7 See also 8 Notes 9 References 10 External linksManufacturing industry EditSee also List of aircraft engines In commercial aviation the major Western manufacturers of turbofan engines are Pratt amp Whitney a subsidiary of Raytheon Technologies General Electric Rolls Royce and CFM International a joint venture of Safran Aircraft Engines and General Electric Russian manufacturers include the United Engine Corporation Aviadvigatel and Klimov Aeroengine Corporation of China was formed in 2016 with the merger of several smaller companies 1 The largest manufacturer of turboprop engines for general aviation is Pratt amp Whitney 2 General Electric announced in 2015 entrance into the market 2 Development history Edit Wright vertical 4 cylinder engine See also Timeline of jet power 1848 John Stringfellow made a steam engine for a 10 foot wingspan model aircraft which achieved the first powered flight albeit with negligible payload 1903 Charlie Taylor built an inline engine mostly of aluminum for the Wright Flyer 12 horsepower 1903 Manly Balzer engine sets standards for later radial engines 3 1906 Leon Levavasseur produces a successful water cooled V8 engine for aircraft use 1908 Rene Lorin patents a design for the ramjet engine 1908 Louis Seguin designed the Gnome Omega the world s first rotary engine to be produced in quantity In 1909 a Gnome powered Farman III aircraft won the prize for the greatest non stop distance flown at the Reims Grande Semaine d Aviation setting a world record for endurance of 180 kilometres 110 mi 1910 Coandă 1910 an unsuccessful ducted fan aircraft exhibited at Paris Aero Salon powered by a piston engine The aircraft never flew but a patent was filed for routing exhaust gases into the duct to augment thrust 4 5 6 7 1914 Auguste Rateau suggests using exhaust powered compressor a turbocharger to improve high altitude performance 3 not accepted after the tests 8 1917 18 The Idflieg numbered R 30 16 example of the Imperial German Luftstreitkrafte s Zeppelin Staaken R VI heavy bomber becomes the earliest known supercharger equipped aircraft to fly with a Mercedes D II straight six engine in the central fuselage driving a Brown Boveri mechanical supercharger for the R 30 16 s four Mercedes D IVa engines 1918 Sanford Alexander Moss picks up Rateau s idea and creates the first successful turbocharger 3 9 1926 Armstrong Siddeley Jaguar IV S the first series produced supercharged engine for aircraft use 10 nb 1 two row radial with a gear driven centrifugal supercharger 1930 Frank Whittle submitted his first patent for a turbojet engine June 1939 Heinkel He 176 is the first successful aircraft to fly powered solely by a liquid fueled rocket engine August 1939 Heinkel HeS 3 turbojet propels the pioneering German Heinkel He 178 aircraft 1940 Jendrassik Cs 1 the world s first run of a turboprop engine It is not put into service 1943 Daimler Benz DB 670 first turbofan runs 1944 Messerschmitt Me 163B Komet the world s first rocket propelled combat aircraft deployed 1945 First turboprop powered aircraft flies a modified Gloster Meteor with two Rolls Royce Trent engines 1947 Bell X 1 rocket propelled aircraft exceeds the speed of sound 1948 100 shp 782 the first turboshaft engine to be applied to aircraft use in 1950 used to develop the larger 280 shp 210 kW Turbomeca Artouste 1949 Leduc 010 the world s first ramjet powered aircraft flight 1950 Rolls Royce Conway the world s first production turbofan enters service 1968 General Electric TF39 high bypass turbofan enters service delivering greater thrust and much better efficiency 2002 HyShot scramjet flew in dive 2004 NASA X 43 the first scramjet to maintain altitude 2020 Pipistrel E 811 is the first electric aircraft engine to be awarded a type certificate by EASA It powers the Pipistrel Velis Electro the first fully electric EASA type certified aeroplane 11 Shaft engines EditReciprocating piston engines Edit Main article reciprocating engine In line engine Edit Main article Straight engine Ranger L 440 air cooled six cylinder inverted in line engine used in Fairchild PT 19 In this entry for clarity the term inline engine refers only to engines with a single row of cylinders as used in automotive language but in aviation terms the phrase inline engine also covers V type and opposed engines as described below and is not limited to engines with a single row of cylinders This is typically to differentiate them from radial engines A straight engine typically has an even number of cylinders but there are instances of three and five cylinder engines The greatest advantage of an inline engine is that it allows the aircraft to be designed with a low frontal area to minimize drag If the engine crankshaft is located above the cylinders it is called an inverted inline engine this allows the propeller to be mounted high up to increase ground clearance enabling shorter landing gear The disadvantages of an inline engine include a poor power to weight ratio because the crankcase and crankshaft are long and thus heavy An in line engine may be either air cooled or liquid cooled but liquid cooling is more common because it is difficult to get enough air flow to cool the rear cylinders directly Inline engines were common in early aircraft one was used in the Wright Flyer the aircraft that made the first controlled powered flight However the inherent disadvantages of the design soon became apparent and the inline design was abandoned becoming a rarity in modern aviation For other configurations of aviation inline engine such as X engines U engines H engines etc see Inline engine aeronautics V type engine Edit A Rolls Royce Merlin V 12 Engine Main article V engine Cylinders in this engine are arranged in two in line banks typically tilted 60 90 degrees apart from each other and driving a common crankshaft The vast majority of V engines are water cooled The V design provides a higher power to weight ratio than an inline engine while still providing a small frontal area Perhaps the most famous example of this design is the legendary Rolls Royce Merlin engine a 27 litre 1649 in3 60 V12 engine used in among others the Spitfires that played a major role in the Battle of Britain Horizontally opposed engine Edit Main article Flat engine A ULPower UL260i horizontally opposed air cooled aero engine A horizontally opposed engine also called a flat or boxer engine has two banks of cylinders on opposite sides of a centrally located crankcase The engine is either air cooled or liquid cooled but air cooled versions predominate Opposed engines are mounted with the crankshaft horizontal in airplanes but may be mounted with the crankshaft vertical in helicopters Due to the cylinder layout reciprocating forces tend to cancel resulting in a smooth running engine Opposed type engines have high power to weight ratios because they have a comparatively small lightweight crankcase In addition the compact cylinder arrangement reduces the engine s frontal area and allows a streamlined installation that minimizes aerodynamic drag These engines always have an even number of cylinders since a cylinder on one side of the crankcase opposes a cylinder on the other side Opposed air cooled four and six cylinder piston engines are by far the most common engines used in small general aviation aircraft requiring up to 400 horsepower 300 kW per engine Aircraft that require more than 400 horsepower 300 kW per engine tend to be powered by turbine engines H configuration engine Edit Main article H engine An H configuration engine is essentially a pair of horizontally opposed engines placed together with the two crankshafts geared together Radial engine Edit A Pratt amp Whitney R 2800 engine Main article Radial engine This type of engine has one or more rows of cylinders arranged around a centrally located crankcase Each row generally has an odd number of cylinders to produce smooth operation A radial engine has only one crank throw per row and a relatively small crankcase resulting in a favorable power to weight ratio Because the cylinder arrangement exposes a large amount of the engine s heat radiating surfaces to the air and tends to cancel reciprocating forces radials tend to cool evenly and run smoothly The lower cylinders which are under the crankcase may collect oil when the engine has been stopped for an extended period If this oil is not cleared from the cylinders prior to starting the engine serious damage due to hydrostatic lock may occur Most radial engines have the cylinders arranged evenly around the crankshaft although some early engines sometimes called semi radials or fan configuration engines had an uneven arrangement The best known engine of this type is the Anzani engine which was fitted to the Bleriot XI used for the first flight across the English Channel in 1909 This arrangement had the drawback of needing a heavy counterbalance for the crankshaft but was used to avoid the spark plugs oiling up In military aircraft designs the large frontal area of the engine acted as an extra layer of armor for the pilot Also air cooled engines without vulnerable radiators are slightly less prone to battle damage and on occasion would continue running even with one or more cylinders shot away However the large frontal area also resulted in an aircraft with an aerodynamically inefficient increased frontal area Rotary engine Edit Le Rhone 9C rotary aircraft engine Main article Rotary engine Rotary engines have the cylinders in a circle around the crankcase as in a radial engine see above but the crankshaft is fixed to the airframe and the propeller is fixed to the engine case so that the crankcase and cylinders rotate The advantage of this arrangement is that a satisfactory flow of cooling air is maintained even at low airspeeds retaining the weight advantage and simplicity of a conventional air cooled engine without one of their major drawbacks The first practical rotary engine was the Gnome Omega designed by the Seguin brothers and first flown in 1909 Its relative reliability and good power to weight ratio changed aviation dramatically 12 Before the first World War most speed records were gained using Gnome engined aircraft and in the early years of the war rotary engines were dominant in aircraft types for which speed and agility were paramount To increase power engines with two rows of cylinders were built However the gyroscopic effects of the heavy rotating engine produced handling problems in aircraft and the engines also consumed large amounts of oil since they used total loss lubrication the oil being mixed with the fuel and ejected with the exhaust gases Castor oil was used for lubrication since it is not soluble in petrol and the resultant fumes were nauseating to the pilots Engine designers had always been aware of the many limitations of the rotary engine so when the static style engines became more reliable and gave better specific weights and fuel consumption the days of the rotary engine were numbered Wankel engine Edit Main article Wankel engine Powerplant from a Schleicher ASH 26e self launching motor glider removed from the glider and mounted on a test stand for maintenance at the Alexander Schleicher GmbH amp Co in Poppenhausen Germany Counter clockwise from top left propeller hub mast with belt guide radiator Wankel engine muffler shroud The Wankel is a type of rotary engine The Wankel engine is about one half the weight and size of a traditional four stroke cycle piston engine of equal power output and much lower in complexity In an aircraft application the power to weight ratio is very important making the Wankel engine a good choice Because the engine is typically constructed with an aluminium housing and a steel rotor and aluminium expands more than steel when heated a Wankel engine does not seize when overheated unlike a piston engine This is an important safety factor for aeronautical use Considerable development of these designs started after World War II but at the time the aircraft industry favored the use of turbine engines It was believed that turbojet or turboprop engines could power all aircraft from the largest to smallest designs The Wankel engine did not find many applications in aircraft but was used by Mazda in a popular line of sports cars The French company Citroen had developed Wankel powered RE 2 fr helicopter in 1970 s 13 In modern times the Wankel engine has been used in motor gliders where the compactness light weight and smoothness are crucially important 14 The now defunct Staverton based firm MidWest designed and produced single and twin rotor aero engines the MidWest AE series These engines were developed from the motor in the Norton Classic motorcycle The twin rotor version was fitted into ARV Super2s and the Rutan Quickie The single rotor engine was put into a Chevvron motor glider and into the Schleicher ASH motor gliders After the demise of MidWest all rights were sold to Diamond of Austria who have since developed a MkII version of the engine As a cost effective alternative to certified aircraft engines some Wankel engines removed from automobiles and converted to aviation use have been fitted in homebuilt experimental aircraft Mazda units with outputs ranging from 100 horsepower 75 kW to 300 horsepower 220 kW can be a fraction of the cost of traditional engines Such conversions first took place in the early 1970s citation needed and as of 10 December 2006 the National Transportation Safety Board has only seven reports of incidents involving aircraft with Mazda engines and none of these is of a failure due to design or manufacturing flaws Combustion cycles Edit The most common combustion cycle for aero engines is the four stroke with spark ignition Two stroke spark ignition has also been used for small engines while the compression ignition Diesel engine is seldom used Starting in the 1930s attempts were made to produce a practical aircraft diesel engine In general Diesel engines are more reliable and much better suited to running for long periods of time at medium power settings The lightweight alloys of the 1930s were not up to the task of handling the much higher compression ratios of diesel engines so they generally had poor power to weight ratios and were uncommon for that reason although the Clerget 14F Diesel radial engine 1939 has the same power to weight ratio as a gasoline radial Improvements in Diesel technology in automobiles leading to much better power weight ratios the Diesel s much better fuel efficiency and the high relative taxation of AVGAS compared to Jet A1 in Europe have all seen a revival of interest in the use of diesels for aircraft Thielert Aircraft Engines converted Mercedes Diesel automotive engines certified them for aircraft use and became an OEM provider to Diamond Aviation for their light twin Financial problems have plagued Thielert so Diamond s affiliate Austro Engine developed the new AE300 turbodiesel also based on a Mercedes engine 15 Competing new Diesel engines may bring fuel efficiency and lead free emissions to small aircraft representing the biggest change in light aircraft engines in decades Power turbines Edit Turboprop Edit Cutaway view of a Garrett TPE 331 turboprop engine showing the gearbox at the front of the engine Main article Turboprop While military fighters require very high speeds many civil airplanes do not Yet civil aircraft designers wanted to benefit from the high power and low maintenance that a gas turbine engine offered Thus was born the idea to mate a turbine engine to a traditional propeller Because gas turbines optimally spin at high speed a turboprop features a gearbox to lower the speed of the shaft so that the propeller tips don t reach supersonic speeds Often the turbines that drive the propeller are separate from the rest of the rotating components so that they can rotate at their own best speed referred to as a free turbine engine A turboprop is very efficient when operated within the realm of cruise speeds it was designed for which is typically 200 to 400 mph 320 to 640 km h Turboshaft Edit An Allison Model 250 turboshaft engine common to many types of helicopters Main article Turboshaft Turboshaft engines are used primarily for helicopters and auxiliary power units A turboshaft engine is similar to a turboprop in principle but in a turboprop the propeller is supported by the engine and the engine is bolted to the airframe in a turboshaft the engine does not provide any direct physical support to the helicopter s rotors The rotor is connected to a transmission which is bolted to the airframe and the turboshaft engine drives the transmission The distinction is seen by some as slim as in some cases aircraft companies make both turboprop and turboshaft engines based on the same design Electric power Edit A number of electrically powered aircraft such as the QinetiQ Zephyr have been designed since the 1960s 16 17 Some are used as military drones 18 In France in late 2007 a conventional light aircraft powered by an 18 kW electric motor using lithium polymer batteries was flown covering more than 50 kilometers 31 mi the first electric airplane to receive a certificate of airworthiness 16 On 18 May 2020 the Pipistrel E 811 was the first electric aircraft engine to be awarded a type certificate by EASA for use in general aviation The E 811 powers the Pipistrel Velis Electro 19 11 Limited experiments with solar electric propulsion have been performed notably the manned Solar Challenger and Solar Impulse and the unmanned NASA Pathfinder aircraft Many big companies such as Siemens are developing high performance electric engines for aircraft use also SAE shows new developments in elements as pure Copper core electric motors with a better efficiency A hybrid system as emergency back up and for added power in take off is offered for sale by Axter Aerospace Madrid Spain 1 Small multicopter UAVs are almost always powered by electric motors Reaction engines EditMain article Jet engine Reaction engines generate the thrust to propel an aircraft by ejecting the exhaust gases at high velocity from the engine the resultant reaction of forces driving the aircraft forwards The most common reaction propulsion engines flown are turbojets turbofans and rockets Other types such as pulsejets ramjets scramjets and pulse detonation engines have also flown In jet engines the oxygen necessary for fuel combustion comes from the air while rockets carry oxygen in some form as part of the fuel load permitting their use in space Jet turbines Edit Turbojet Edit A General Electric J85 GE 17A turbojet engine This cutaway clearly shows the 8 stages of axial compressor at the front left side of the picture the combustion chambers in the middle and the two stages of turbines at the rear of the engine Main article Turbojet A turbojet is a type of gas turbine engine that was originally developed for military fighters during World War II A turbojet is the simplest of all aircraft gas turbines It consists of a compressor to draw air in and compress it a combustion section where fuel is added and ignited one or more turbines that extract power from the expanding exhaust gases to drive the compressor and an exhaust nozzle that accelerates the exhaust gases out the back of the engine to create thrust When turbojets were introduced the top speed of fighter aircraft equipped with them was at least 100 miles per hour faster than competing piston driven aircraft In the years after the war the drawbacks of the turbojet gradually became apparent Below about Mach 2 turbojets are very fuel inefficient and create tremendous amounts of noise Early designs also respond very slowly to power changes a fact that killed many experienced pilots when they attempted the transition to jets These drawbacks eventually led to the downfall of the pure turbojet and only a handful of types are still in production The last airliner that used turbojets was the Concorde whose Mach 2 airspeed permitted the engine to be highly efficient Turbofan Edit A cutaway of a CFM56 3 turbofan engine Main article Turbofan A turbofan engine is much the same as a turbojet but with an enlarged fan at the front that provides thrust in much the same way as a ducted propeller resulting in improved fuel efficiency Though the fan creates thrust like a propeller the surrounding duct frees it from many of the restrictions that limit propeller performance This operation is a more efficient way to provide thrust than simply using the jet nozzle alone and turbofans are more efficient than propellers in the transsonic range of aircraft speeds and can operate in the supersonic realm A turbofan typically has extra turbine stages to turn the fan Turbofans were among the first engines to use multiple spools concentric shafts that are free to rotate at their own speed to let the engine react more quickly to changing power requirements Turbofans are coarsely split into low bypass and high bypass categories Bypass air flows through the fan but around the jet core not mixing with fuel and burning The ratio of this air to the amount of air flowing through the engine core is the bypass ratio Low bypass engines are preferred for military applications such as fighters due to high thrust to weight ratio while high bypass engines are preferred for civil use for good fuel efficiency and low noise High bypass turbofans are usually most efficient when the aircraft is traveling at 500 to 550 miles per hour 800 to 885 km h the cruise speed of most large airliners Low bypass turbofans can reach supersonic speeds though normally only when fitted with afterburners Pulse jets Edit Main article Pulsejet Pulse jets are mechanically simple devices that in a repeating cycle draw air through a no return valve at the front of the engine into a combustion chamber and ignite it The combustion forces the exhaust gases out the back of the engine It produces power as a series of pulses rather than as a steady output hence the name The only application of this type of engine was the German unmanned V1 flying bomb of World War II Though the same engines were also used experimentally for ersatz fighter aircraft the extremely loud noise generated by the engines caused mechanical damage to the airframe that was sufficient to make the idea unworkable Rocket Edit An XLR99 Main article Rocket engine A few aircraft have used rocket engines for main thrust or attitude control notably the Bell X 1 and North American X 15 Rocket engines are not used for most aircraft as the energy and propellant efficiency is very poor but have been employed for short bursts of speed and takeoff Where fuel propellant efficiency is of lesser concern rocket engines can be useful because they produce very large amounts of thrust and weigh very little Precooled jet engines Edit Main article Precooled jet engine For very high supersonic low hypersonic flight speeds inserting a cooling system into the air duct of a hydrogen jet engine permits greater fuel injection at high speed and obviates the need for the duct to be made of refractory or actively cooled materials This greatly improves the thrust weight ratio of the engine at high speed It is thought that this design of engine could permit sufficient performance for antipodal flight at Mach 5 or even permit a single stage to orbit vehicle to be practical The hybrid air breathing SABRE rocket engine is a pre cooled engine under development Piston turbofan hybrid Edit At the April 2018 ILA Berlin Air Show Munich based research institute de Bauhaus Luftfahrt presented a high efficiency composite cycle engine for 2050 combining a geared turbofan with a piston engine core The 2 87 m diameter 16 blade fan gives a 33 7 ultra high bypass ratio driven by a geared low pressure turbine but the high pressure compressor drive comes from a piston engine with two 10 piston banks without a high pressure turbine increasing efficiency with non stationary isochoric isobaric combustion for higher peak pressures and temperatures The 11 200 lb 49 7 kN engine could power a 50 seat regional jet 20 Its cruise TSFC would be 11 5 g kN s 0 406 lb lbf hr for an overall engine efficiency of 48 2 for a burner temperature of 1 700 K 1 430 C an overall pressure ratio of 38 and a peak pressure of 30 MPa 300 bar 21 Although engine weight increases by 30 aircraft fuel consumption is reduced by 15 22 Sponsored by the European Commission under Framework 7 project LEMCOTEC Bauhaus Luftfahrt MTU Aero Engines and GKN Aerospace presented the concept in 2015 raising the overall engine pressure ratio to over 100 for a 15 2 fuel burn reduction compared to 2025 engines 23 Engine position numbering Edit The thrust levers of a three engine Boeing 727 each one bearing the respective engine number On multi engine aircraft engine positions are numbered from left to right from the point of view of the pilot looking forward so for example on a four engine aircraft such as the Boeing 747 engine No 1 is on the left side farthest from the fuselage while engine No 3 is on the right side nearest to the fuselage 24 In the case of the twin engine English Electric Lightning which has two fuselage mounted jet engines one above the other engine No 1 is below and to the front of engine No 2 which is above and behind 25 In the Cessna 337 Skymaster a push pull twin engine airplane engine No 1 is the one at the front of the fuselage while engine No 2 is aft of the cabin Fuel EditAircraft reciprocating piston engines are typically designed to run on aviation gasoline Avgas has a higher octane rating than automotive gasoline to allow higher compression ratios power output and efficiency at higher altitudes Currently the most common Avgas is 100LL This refers to the octane rating 100 octane and the lead content LL low lead relative to the historic levels of lead in pre regulation Avgas citation needed Refineries blend Avgas with tetraethyllead TEL to achieve these high octane ratings a practice that governments no longer permit for gasoline intended for road vehicles The shrinking supply of TEL and the possibility of environmental legislation banning its use have made a search for replacement fuels for general aviation aircraft a priority for pilots organizations 26 Turbine engines and aircraft diesel engines burn various grades of jet fuel Jet fuel is a relatively less volatile petroleum derivative based on kerosene but certified to strict aviation standards with additional additives citation needed Model aircraft typically use nitro engines also known as glow engines due to the use of a glow plug powered by glow fuel a mixture of methanol nitromethane and lubricant Electrically powered model airplanes 27 and helicopters are also commercially available Small multicopter UAVs are almost always powered by electricity 28 29 but larger gasoline powered designs are under development 30 31 32 See also EditAircraft diesel engine Aviation safety Engine configuration Federal Aviation Regulations Hyper engine List of aircraft engines Model engine United States military aircraft engine designationsNotes Edit The world s first series produced cars with superchargers came earlier than aircraft These were Mercedes 6 25 40 hp and Mercedes 10 40 65 hp both models introduced in 1921 and used Roots superchargers G N Georgano ed 1982 The new encyclopedia of motorcars 1885 to the present 3rd ed New York Dutton pp 415 ISBN 978 0 525 93254 3 References Edit China launches state owned aircraft engine maker CCTV America August 29 2016 a b GE Pushes Into Turboprop Engines Taking on Pratt Wall Street Journal November 16 2015 a b c Ian McNeil ed 1990 Encyclopedia of the History of Technology London Routledge pp 315 21 ISBN 978 0 203 19211 5 Gibbs Smith Charles Harvard 1970 Aviation an historical survey from its origins to the end of World War II London Her Majesty s Stationery Office ISBN 9780112900139 Gibbs Smith Charles Harvard 1960 The Aeroplane An Historical Survey of Its Origins and Development London Her Majesty s Stationery Office Winter Frank H December 1980 Ducted Fan or the World s First Jet Plane The Coanda claim re examined The Aeronautical Journal Royal Aeronautical Society 84 Antoniu Dan Cicoș George Buiu Ioan Vasile Bartoc Alexandru Șutic Robert 2010 Henri Coandă and his technical work during 1906 1918 in Romanian Bucharest Editura Anima ISBN 978 973 7729 61 3 Guttman Jon 2009 SPAD XIII vs Fokker D VII Western Front 1918 1st ed Oxford Osprey pp 24 25 ISBN 978 1 84603 432 9 Powell Hickman Jun 1941 He Harnessed a Tornado Popular Science Anderson John D 2002 The airplane A history of its technology Reston VA USA American Institute of Aeronautics and Astronautics pp 252 53 ISBN 978 1 56347 525 2 a b Calderwood Dave 9 July 2020 Pipistrel offers type certified electric motor Seager Publishing FLYER Magazine Retrieved 18 August 2020 Gibbs Smith C H 2003 Aviation London NMSO p 175 ISBN 1 9007 4752 9 Boulay Pierre 1998 Guides Lariviere ed Les helicopteres francais in French ISBN 978 2 907051 17 0 ASH 26 E Information DE Alexander Schleicher Archived from the original on 2006 10 08 Retrieved 2006 11 24 Diamond Twins Reborn Flying Mag Archived from the original on 2014 06 18 Retrieved 2010 06 14 a b Worldwide premiere first aircraft flight with electrical engine Association pour la Promotion des Aeronefs a Motorisation Electrique December 23 2007 archived from the original on 2008 01 10 Superconducting Turbojet Physorg com archived from the original on 2008 02 23 Voyeur Litemachines archived from the original on 2009 12 31 TCDS for E811 engine model 268MVLC PDF European Union Aviation Safety Agency 18 May 2020 Retrieved 18 August 2020 David Kaminski Morrow 24 April 2018 Hybrid geared fan and piston concept could slash fuel burn Flightglobal Composite Cycle Engine concept technical data sheet PDF Bauhaus Luftfahrt The composite cycle engine concept Bauhaus Luftfahrt Sascha Kaiser et al July 2015 A Composite Cycle Engine Concept with Hecto Pressure Ratio AIAA Propulsion and Energy Conference doi 10 2514 6 2015 4028 ISBN 978 1 62410 321 6 National Business Aircraft Association 1952 Skyways for business Henry Publications p 52 a href Template Cite book html title Template Cite book cite book a author has generic name help English Electric Lightning F53 53 671 Power Plants Gatwick Aviation Museum Archived from the original on 12 June 2018 Retrieved 9 June 2018 EAA S Earl Lawrence Elected Secretary of International Aviation Fuel Committee Press release Archived from the original on March 3 2013 Electric Airplanes RTF www nitroplanes com Amazon com Photography Drones Store Buying Guide Electronics Amazon RC Quadcopters www nitroplanes com Yeair hybrid gasoline electric quadcopter boasts impressive numbers www gizmag com Goliath A Gas Powered Quadcopter hackaday io Heavy Lifting Quadcopter Lifts 50 Pound Loads It s a Gas Powered HULK HLQ Industry Tap www industrytap com 2013 03 11 External links Edit Wikimedia Commons has media related to Aircraft engines Look up aircraft engine in Wiktionary the free dictionary Aircraft Engines and Aircraft Engine Theory includes links to diagrams The Aircraft Engine Historical Society Jet Engine Specification Database Aircraft Engine Efficiency Comparison of Counter rotating and Axial Aircraft LP Turbines The History of Aircraft Power Plants Briefly Reviewed From the 7 lb per h p Days to the 1 lb per h p of To day The Quest for Power a 1954 Flight article by Bill Gunston Engine Directory Flight International 24 September 1997 Retrieved from https en wikipedia org w index php title Aircraft engine amp oldid 1131051395, wikipedia, wiki, book, books, library,

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