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Rotax 503

January 26, 2023

The Rotax 503 is a 37 kW (50 hp), inline 2-cylinder, two-stroke aircraft engine, built by BRP-Rotax GmbH & Co. KG of Austria for use in ultralight aircraft.[1][2]

503
Rotax 503 trade show display
Type Piston aero-engine
National origin Austria
Manufacturer Rotax
Major applications Quad City Challenger
Blue Yonder EZ Flyer
Produced until 2011
A Rotax 503 mounted on a Flightstar II ultralight
The prototype Blue Yonder Twin Engine EZ Flyer is powered by two 503s in pusher configuration
Air Creation Racer ultralight trike with Rotax 503 mounted up-right. Below the muffler is the smaller after-muffler.

As of 2011 the Rotax 503 is no longer in production.[3]

Design and development

The Rotax 503 is piston ported with air-cooled cylinders and heads, utilizing either an engine driven fan and cowl, or free air cooling. Lubrication is either by use of pre-mixed fuel and oil or oil injection from an externally mounted oil tank. The 503 has dual independent breakerless, magneto capacitor-discharge ignition (CDI) systems. It can be equipped with either one or two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure. An optional High Altitude Compensation kit is available.[1][2]

The engine's propeller drive is via a Rotax type B, C, or E style gearbox. The standard engine includes a muffler exhaust system with an extra after-muffler as optional. The standard starter is a recoil start type, with an electric starter optional. An integral alternating current generator producing 170 watts at 12 volts with external rectifier-regulator is optional. The engine includes an intake air filter and can be fitted with an intake silencer system.[1][2]

Limitations

The manufacturer acknowledges the design limitations of this engine, warning pilots:[1]

"This engine, by its design, is subject to sudden stoppage. Engine stoppage can result in crash landings, forced landings or no power landings. Such crash landings can lead to serious bodily injury or death...This is not a certificated aircraft engine. It has not received any safety or durability testing, and conforms to no aircraft standards. It is for use in experimental, uncertificated aircraft and vehicles only in which an engine failure will not compromise safety. User assumes all risk of use, and acknowledges by his use that he knows this engine is subject to sudden stoppage...Never fly the aircraft equipped with this engine at locations, airspeeds, altitudes, or other circumstances from which a successful no-power landing cannot be made, after sudden engine stoppage. Aircraft equipped with this engine must only fly in DAYLIGHT VFR conditions."[1]

Applications

Specifications (503)

Data from OPERATORS MANUAL FOR ENGINE TYPES 447, 503 & 582[1]

General characteristics

  • Type: two-stroke air-cooled aeroengine
  • Bore: 72 mm (2.84 in)
  • Stroke: 61 mm (2.4 in)
  • Displacement: 496.7 cc (30.31 cu in)
  • Dry weight: 31.4 kg (69 lb) (dry, no exhaust system)

Components

  • Valvetrain: piston ports
  • Fuel system: pneumatic pump pressurized
  • Fuel type: regular autofuel
  • Oil system: premixed in the fuel at 50:1 or oil injection
  • Cooling system: fan or free air
  • Reduction gear: Rotax 'B' gearbox: 2.00, 2.24 or 2.58 ratios; Rotax 'C' or 'D' gearbox: 2.62, 3.00, 3.47 or 4.00 ratios

Performance

References

  1. ^ a b c d e f BRP-Rotax GmbH & Co. KG (2006). "OPERATORS MANUAL FOR ENGINE TYPES 447, 503 & 582" (PDF). Retrieved March 9, 2009.
  2. ^ a b c Raisner, William: LEAF catlog, pages 6-105. Leading Edge Airfoils, 1995.
  3. ^ "Rotax Website - Aircraft Overview". Brp-powertrain.com. Retrieved September 1, 2012.

External links

 
Wikimedia Commons has media related to Rotax 503.

January 26, 2023
rotax, inline, cylinder, stroke, aircraft, engine, built, rotax, gmbh, austria, ultralight, aircraft, trade, show, displaytype, piston, aero, enginenational, origin, austriamanufacturer, rotaxmajor, applications, quad, city, challengerblue, yonder, flyerproduc. The Rotax 503 is a 37 kW 50 hp inline 2 cylinder two stroke aircraft engine built by BRP Rotax GmbH amp Co KG of Austria for use in ultralight aircraft 1 2 503Rotax 503 trade show displayType Piston aero engineNational origin AustriaManufacturer RotaxMajor applications Quad City ChallengerBlue Yonder EZ FlyerProduced until 2011A Rotax 503 mounted on a Flightstar II ultralight The prototype Blue Yonder Twin Engine EZ Flyer is powered by two 503s in pusher configuration Air Creation Racer ultralight trike with Rotax 503 mounted up right Below the muffler is the smaller after muffler As of 2011 the Rotax 503 is no longer in production 3 Contents 1 Design and development 1 1 Limitations 2 Applications 3 Specifications 503 3 1 General characteristics 3 2 Components 3 3 Performance 4 References 5 External linksDesign and development EditThe Rotax 503 is piston ported with air cooled cylinders and heads utilizing either an engine driven fan and cowl or free air cooling Lubrication is either by use of pre mixed fuel and oil or oil injection from an externally mounted oil tank The 503 has dual independent breakerless magneto capacitor discharge ignition CDI systems It can be equipped with either one or two piston type carburetors It uses a manifold driven pneumatic fuel pump to provide fuel pressure An optional High Altitude Compensation kit is available 1 2 The engine s propeller drive is via a Rotax type B C or E style gearbox The standard engine includes a muffler exhaust system with an extra after muffler as optional The standard starter is a recoil start type with an electric starter optional An integral alternating current generator producing 170 watts at 12 volts with external rectifier regulator is optional The engine includes an intake air filter and can be fitted with an intake silencer system 1 2 Limitations Edit The manufacturer acknowledges the design limitations of this engine warning pilots 1 This engine by its design is subject to sudden stoppage Engine stoppage can result in crash landings forced landings or no power landings Such crash landings can lead to serious bodily injury or death This is not a certificated aircraft engine It has not received any safety or durability testing and conforms to no aircraft standards It is for use in experimental uncertificated aircraft and vehicles only in which an engine failure will not compromise safety User assumes all risk of use and acknowledges by his use that he knows this engine is subject to sudden stoppage Never fly the aircraft equipped with this engine at locations airspeeds altitudes or other circumstances from which a successful no power landing cannot be made after sudden engine stoppage Aircraft equipped with this engine must only fly in DAYLIGHT VFR conditions 1 Applications Edit21st Century Airships SPAS 13 Adams Wilson Hobbycopter A B Helicopters A W 95 Aces High Cuby II Acrolite Advanced Aeromarine Buccaneer SX Aero Adventure Aventura HP AeroLites Bearcat Aeroprakt A 20 Aeros 2 Aeros Cross Country Aero Works Aerolite 103 Airbet Girabet Airborne Edge Airborne Redback Air Creation GT Air Creation Racer Air Creation Twin Airdrome Dream Fantasy Twin Airdrome Fokker D VI Airdrome Fokker D VIII Airfer Transan Airframes Unlimited SS 2 Trainer Air Sylphe 447 Alliant Destiny Fusion Alliant Destiny XLT Alpaero Choucas AmeriPlanes Mitchell Wing T 10 Anglin J6 Karatoo Antonov T 2M Maverick Antares A 10R503 SOLO Antares MA 32 Apex Eco 6 Aquilair Kid Australian Autogyro Skyhook Australian Ultralight Industries Bunyip Aviasud Mistral Avid Champion Avid Flyer Aviomania Genesis Duo G2SA BAaer Guri Bagalini Baganfibio Baker Supercat BB Microlight BB two seater Birdman Chinook 2S Best Off Skyranger Blue Yonder EZ Flyer Blue Yonder EZ Harvard Blue Yonder EZ King Cobra Blue Yonder Merlin Blue Yonder Twin Engine EZ Flyer Buckeye Eclipse Calumet Snobird Explorer Capella Javelin II Capella SS Carlson Sparrow Circa Reproductions Morane Saulnier N Circa Reproductions Nieuport CFM Shadow CGS Hawk Chadwick C 122 helicopter Club ULM Rotor Ptenets 2 Cosmos Bison Cosmos Echo Cosmos Phase II Cyclone AX2000 Danieli Piuma DAR 23 DTA Evolution Earthstar Thunder Gull Emerald Coast XL2 Sport Eurofly Fire Cat Eurofly Fire Fox Eurofly Fox Eurofly Viper Excalibur Aircraft Excalibur Facetmobile Fisher Avenger Fisher Super Koala Fisher FP 404 EXP Fisher FP 505 Skeeter Fisher FP 606 Sky Baby Fisher Youngster Fletcher Hercules Flightstar II Fly Air Swallow Flying K Sky Raider Flylab Tucano Fly Synthesis Wallaby Freebird II Freedom Lite SS 11 Skywatch GibboGear Butterfly Gidroplan Che 22 Korvet Golden Circle Air T Bird Krasniye Kryl ya Mandelevium MD 30 Krasniye Kryl ya Deltacraft MD 40 Harmening High Flyer Harper Lil Breezy Heldeberg Convertible Heldeberg Marathon Heldeberg Spirit 103 Howland H 3 Pegasus Huntwing Hy Tek Clipwing Hy Tek Hurricane Hauler InterPlane Skyboy ISON Airbike J amp J Ultralights Seawing JDT Eros Joplin Tundra Kolb Firestar Kolb Mark III Kolb Slingshot 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Kalinauskas RK 7 Orange Rotor Flight Dynamics Dominator Rotorwing Aero 3D RV Skystar Kitfox XL Sabre 340 Sabre Wildcat St Andrews Viking Sapphire Aircraft Australia Sapphire LSA Sea Bow International Sea Bow Six Chuter Skye Ryder Aerochute Six Chuter SR1 Skymaster Single Seater Sky Seeker Powerchutes Sky Seeker SlipStream Genesis Sochen Phoenix Solo Wings Aquilla Solo Wings Windlass Sorrell Hiperlight Spartan DFD Aerotome Skywatch SS11 Spectrum Beaver Sport Copter Lightning Sport Flight Talon Star Lite Warp 1 A Stellar Astra Summit 2 Summit 103 Mini Breeze Summit Steel Breeze Sundog One Seater Synairgie Jet Ranger TC s Trikes Coyote Teman Mono Fly Tennessee Propellers Scout TeST TST 3 Alpin T Titan Tornado TL Ultralight TL 32 Typhoon Ultracraft Calypso Viking Aircraft Viking II ViS Sprint Vortech A W 95 Vortech G 1 Vortech Sparrow World Seair Corp SeairSpecifications 503 EditData from OPERATORS MANUAL FOR ENGINE TYPES 447 503 amp 582 1 General characteristics Type two stroke air cooled aeroengine Bore 72 mm 2 84 in Stroke 61 mm 2 4 in Displacement 496 7 cc 30 31 cu in Dry weight 31 4 kg 69 lb dry no exhaust system Components Valvetrain piston ports Fuel system pneumatic pump pressurized Fuel type regular autofuel Oil system premixed in the fuel at 50 1 or oil injection Cooling system fan or free air Reduction gear Rotax B gearbox 2 00 2 24 or 2 58 ratios Rotax C or D gearbox 2 62 3 00 3 47 or 4 00 ratiosPerformance Power output 37 kW 50 hp at 6800 rpm Compression ratio 10 8 theoretical Fuel consumption 15 L hr 4 US gph Power to weight ratio 1 18 kW kg 0 72 hp lb References Edit a b c d e f BRP Rotax GmbH amp Co KG 2006 OPERATORS MANUAL FOR ENGINE TYPES 447 503 amp 582 PDF Retrieved March 9 2009 a b c Raisner William LEAF catlog pages 6 105 Leading Edge Airfoils 1995 Rotax Website Aircraft Overview Brp powertrain com Retrieved September 1 2012 External links Edit Wikimedia Commons has media related to Rotax 503 Retrieved from https en wikipedia org w index php title Rotax 503 amp oldid 1065242409, wikipedia, wiki, book, books, library,

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