Armstrong Siddeley Hyena
|Major applications||Armstrong Whitworth A.W.16|
The Armstrong Siddeley Hyena was a British aero engine developed by Armstrong Siddeley. Designed in the 1930s, it was an unusual experimental radial engine with inline cylinder banks. It was flown using an Armstrong Whitworth A.W.16 fighter aircraft as a test bed. Unresolved problems with cooling of the rear cylinders prevented the engine from going into production. Few details of this engine survive as company records were lost.
Armstrong Siddely in-line radial engines
The Hyena arrangement of cylinder banks arranged as a radial engine was continued with further designs, but with little commercial success. Only the Deerhound and Hyena being built.
- 15 cylinders (5 banks of 3 cyl.)
- 14 cylinders (7 banks of 2 cyl.)
- 21 cylinders (7 banks of 3 cyl.)
- 28 cylinders (7 banks of 4 cyl.)
- 24 cylinders (6 banks of 4 cyl.)
- 36 cylinders (9 banks of 4 cyl.)
Data from Lumsden.
- Type: 15-cylinder 3-row radial engine with inline banks.
- Bore: 5.3 in (137 mm)
- Stroke: 4.88 in (125 mm)
- Displacement: 1,615.58 cu in (26.6 L)
- Valvetrain: Overhead poppet valves
- Supercharger: Medium supercharged
- Fuel type: 77 Octane petrol
- Cooling system: Air-cooled
- Reduction gear: Epicyclic geared, left hand tractor
- Power output: 618 hp at 2,000 rpm at sea level
- Armstrong Siddeley Deerhound
- BMW 803
- Curtiss H-1640
- Daimler-Benz DB 604
- Dobrynin VD-4K
- Junkers Jumo 222
- Lycoming R-7755
- Wright R-2160 Tornado
- Gunston, Bill (1986). World Encyclopedia of Aero Engines. Guild Publishing. p. 18.
- Pearce, William. "Armstrong Siddeley 'Dog' Aircraft Engines". oldmachinepress.com. Retrieved 9 May 2016.
- Lumsden 2003, p.76.