Armstrong Siddeley Cheetah

The Armstrong Siddeley Cheetah is a British air-cooled aircraft radial engine.

Development

The basic design of the Cheetah remained unchanged since its introduction in 1919. It was the first engine of its type to be certified for 1,200 hours of operational time between overhauls, with over 35,000 examples built.

The Cheetah was used to power many British trainer aircraft during World War II including the Avro Anson and Airspeed Oxford.

Variants

* Cheetah IX – 345 hp (257 kW) at 2,425 rpm
* Cheetah X – 375 hp (280 kW) at 2,300 rpm
* Cheetah XV – 420 hp (315 kW) at 2,550 rpm
* Cheetah 25 – Cheetah XV uprated to 475 hp (355 kW) at 2,700 rpm

Applications

* Airspeed Consul
* Airspeed Courier
* Airspeed Envoy
* Airspeed Oxford
* Airspeed Queen Wasp
* Airspeed Viceroy
* Avro 626
* Avro Anson
* CASA C-201 Alcotán
* Hispano HS-42
* Koolhoven F.K.51

pecifications (Cheetah IX)

pistonspecs

ref= [Lumsden 2003, p.75.]
type=Seven-cylinder single-row supercharged air-cooled radial engine
bore=5.25 in (133 mm)
stroke=5.5 in (140 mm)
displacement=834 in³ (13.65 l)
length=52.8 in (1,342 mm)
diameter=47.6 in (1,210 mm)
width=
height=
weight=637 lb (289 kg)
valvetrain=Two pushrod-actuated valves per cylinder
supercharger=Centrifugal, 5.4:1 reduction
turbocharger=
fuelsystem=Claudel-Hobson carburetor
fueltype=87 octane rating gasoline
oilsystem=
coolingsystem=Air-cooled
power=
*338 hp (252 kW) at 2,100 rpm for takeoff
*345 hp (257 kW) at 2,425 rpm at 7,875 ft (2,400 m)
specpower=0.41 hp/in³ (18.83 kW/l)
compression=6.35:1
fuelcon=
specfuelcon=0.45 lb/(hp•h) (271 g/(kW•h))
oilcon=0.24–0.45 oz/(hp•h) (9–17 g/(kW•h))
power/weight=0.54 hp/lb (0.89 kW/kg)

designer=
reduction_gear=No

general_other=
components_other=
performance_other=

pecifications (Cheetah XV)

pistonspecs

ref= [cite book|last=Bridgman, L, (ed.)|year=1998|title=Jane's fighting aircraft of World War II.|publisher=Crescent|isbn=978-0-517-67964-7]
type=Seven-cylinder single-row supercharged air-cooled radial engine
bore=5.25 in (133 mm)
stroke=5.5 in (140 mm)
displacement=834 in³ (13.65 l)
length=49.6 in (1261 mm)
diameter=47.6 in (1210 mm)
width=22.2 in (564 mm)
height=
weight=805 lb (365 kg)
valvetrain=Two pushrod-actuated valves per cylinder with sodium-filled exhaust valve
supercharger=Centrifugal
turbocharger=
fuelsystem=Claudel-Hobson carburetor
fueltype=87 octane rating gasoline
oilsystem=
coolingsystem=Air-cooled
power=
*420 hp (315 kW) at 2,550 rpm for takeoff at sea level
*400 hp (300 kW) at 2,425 rpm for cruise at 4,000 ft (1,220 m)
specpower=0.50 hp/in³ (23.1 kW/l)
compression=6.35:1
fuelcon=16 Imp gal (3.5 l) /hour at economical cruise
specfuelcon=
oilcon=
power/weight=0.52 hp/lb (0.86 kW/kg)

ee also

Aeroenginecontent

related=

similar aircraft=

lists=
* List of aircraft engines

References

Notes

Bibliography

*cite book|last=Bridgman, L, (ed.)|year=1998|title=Jane's fighting aircraft of World War II.|publisher=Crescent|isbn=978-0-517-67964-7
* Lumsden, Alec. "British Piston Engines and their Aircraft". Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links