The Rolls-Royce Exe, or Boreas,[1] was a 24-cylinder air-cooled X blocksleeve valveaircraft engine intended primarily for the new FaireyFleet Air Arm aircraft, particularly the Fairey Barracuda. The Exe was relatively powerful for its era, producing about 1,100 hp (820 kW). This is notable given the relatively small 1,300 cubic inches (22 L) displacement, the Merlin requiring 1,600 cubic inches (27 L) for approximately the same power level. The X-24 layout made this quite a compact engine.
The Exe was under development in 1939, having been started in the 1930s, along with the Peregrine and Vulture. Work on the Exe was suspended in August 1939,[2] and stopped about August 1940.[3]Ernest Hives, head of the Rolls-Royce aero engine division, wanted to stop work on the Exe, Peregrine, and Vulture to concentrate on the Merlin and Griffon engines. An enlarged version, the Rolls-Royce Pennine, was built later in the war, but cancelled as jet engines became the company's focus.
Originally intended for the Supermarine Type 322 and Fairey Barracuda the Exe was only test flown in a Fairey Battle, the first flight taking place on 30 November 1938. This aircraft continued in use for some time as a communications aircraft where the Exe was noted to be quite reliable in service.[4]
Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN1-85260-163-9
Lloyd, Ian Rolls-Royce: The Merlin at War (1978, Macmillan London) ISBN0-333-24016-2
Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN1-85310-294-6.
Pugh, Peter.The Magic of a Name: The Rolls-Royce Story, The first 40 Years (2000, Icon Books Cambridge) ISBN1-84046-151-9
Rubbra, A.A. Rolls-Royce Piston Aero Engines - a designer remembers: Historical Series no 16 :Rolls-Royce Heritage Trust, 1990. ISBN1-872922-00-7
External linksedit
Photo of the Rolls-Royce Exe
The Exe-engined Fairey Battle (top picture) in a 1948 issue of Flight
January 01, 1970
rolls, royce, boreas, cylinder, cooled, block, sleeve, valve, aircraft, engine, intended, primarily, fairey, fleet, aircraft, particularly, fairey, barracuda, relatively, powerful, producing, about, this, notable, given, relatively, small, cubic, inches, displ. The Rolls Royce Exe or Boreas 1 was a 24 cylinder air cooled X block sleeve valve aircraft engine intended primarily for the new Fairey Fleet Air Arm aircraft particularly the Fairey Barracuda The Exe was relatively powerful for its era producing about 1 100 hp 820 kW This is notable given the relatively small 1 300 cubic inches 22 L displacement the Merlin requiring 1 600 cubic inches 27 L for approximately the same power level The X 24 layout made this quite a compact engine Exe Type Piston X 24 aero engine National origin United Kingdom Manufacturer Rolls Royce Limited First run September 1936 Major applications Fairey Battle Developed into Rolls Royce Pennine The Exe was named after the River Exe although Rolls Royce later transferred the use of river names to its gas turbine engines Contents 1 Design and development 2 Applications 3 Specifications Exe 3 1 General characteristics 3 2 Components 3 3 Performance 4 See also 5 References 5 1 Notes 5 2 Bibliography 6 External linksDesign and development editThe Exe was under development in 1939 having been started in the 1930s along with the Peregrine and Vulture Work on the Exe was suspended in August 1939 2 and stopped about August 1940 3 Ernest Hives head of the Rolls Royce aero engine division wanted to stop work on the Exe Peregrine and Vulture to concentrate on the Merlin and Griffon engines An enlarged version the Rolls Royce Pennine was built later in the war but cancelled as jet engines became the company s focus Originally intended for the Supermarine Type 322 and Fairey Barracuda the Exe was only test flown in a Fairey Battle the first flight taking place on 30 November 1938 This aircraft continued in use for some time as a communications aircraft where the Exe was noted to be quite reliable in service 4 Applications editFairey Barracuda intended Fairey Battle testbed Supermarine Type 322 intended Specifications Exe editData from Gunston and Lumsden 5 6 General characteristics Type 24 cylinder supercharged air cooled 90 degree X layout aircraft piston engine Bore 4 225 in 107 3 mm Stroke 4 0 in 100 mm Displacement 1 348 in3 22 09 L Dry weight 1 530 lb 690 kg Components Valvetrain Sleeve valve Supercharger Gear driven centrifugal type supercharger single stage Fuel type Petrol Cooling system Pressure air cooled Reduction gear 0 358 1 left hand tractor Performance Power output 1 150 hp 860 kW at 4 200 rpm 4 5 psi boost at sea level Compression ratio 8 1 Power to weight ratio 0 75 hp lb 1 23 kW kg See also editRolls Royce aircraft piston engines Related development Rolls Royce Pennine Comparable engines Allison V 3420 Isotta Fraschini Zeta Junkers Jumo 222 Napier Sabre Related lists List of aircraft enginesReferences editNotes edit This name was dropped due to conflict with the Bristol Aeroplane Company s series of Greek mythology named engines Lumsden 2003 p 201 Lloyd 1978 p4 5 Pugh 2000 p 263 265 Rubbra 1990 p 148 Gunston 1989 p 142 Lumsden 2003 p 201 Bibliography edit Gunston Bill World Encyclopaedia of Aero Engines Cambridge England Patrick Stephens Limited 1989 ISBN 1 85260 163 9 Lloyd Ian Rolls Royce The Merlin at War 1978 Macmillan London ISBN 0 333 24016 2 Lumsden Alec British Piston Engines and their Aircraft Marlborough Wiltshire Airlife Publishing 2003 ISBN 1 85310 294 6 Pugh Peter The Magic of a Name The Rolls Royce Story The first 40 Years 2000 Icon Books Cambridge ISBN 1 84046 151 9 Rubbra A A Rolls Royce Piston Aero Engines a designer remembers Historical Series no 16 Rolls Royce Heritage Trust 1990 ISBN 1 872922 00 7External links editPhoto of the Rolls Royce Exe The Exe engined Fairey Battle top picture in a 1948 issue of Flight Retrieved from https en wikipedia org w index php title Rolls Royce Exe amp oldid 1128870973, wikipedia, wiki, book, books, library,
