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The Rolls Royce Kestrel Aircraft Engine

The Rolls Royce Kestrel was a successful V12 aero engine which first ran in 1926, the British Air Ministry had wanted more powerful and lighter engines utilising cast aluminium blocks, as no British company was developing such an engine they ordered both Rolls-Royce and Napier & Son to design one, the Rolls Royce Kestrel was designed to meet the Ministry's requirements.

Rolls Royce Kestrel XVI


The Rolls Royce Kestrel proved to be a state of the art engine, it not only had a cast aluminium block but also featured a pressurised cooling system, existing water cooled engines were limited in they altitude they could run at as as the air pressure decreased with altitude the water boiled in to steam at lower temperatures, the pressurised system allowed the engine to run up to 150 C at any altitude before the coolant boiled.

The prototype Rolls Royce Kestrel first ran in 1926 and powered an aircraft the following year. The engines power output was initially 450 hp (340 kW) and eventually reached 720 hp (537 kW) by 1940. The high power output, weight and reliability lead to the Rolls Royce Kestrel being the first choice for many military aircraft, it was even chosen to power the infamous German WW2 prototypes of the Messerschmitt Bf 109 fighter and the Junkers Ju 87 "Stuka" dive bomber.

Aircraft that were powered by the Rolls Royce Kestrel

Airco DH.9Avro AntelopeBlackburn Nautilus
Blackburn SydneyFairey FleetwingFairey Hendon
Fairey S.9/30Fokker C.VFokker C.X
Fokker D.XVIIGloster GnatsnapperGloster TC.33
Gloster TSR.38Handley Page HamiltonHandley Page Heyford
Handley Page H.P.30Hawker AudaxHawker Demon
Hawker FuryHawker HardyHawker Hart
Hawker HindHawker HornetHawker Nimrod
Miles MasterHawker OspreyHeinkel He 70 G-1Heinkel He 112
Henschel Hs 122Junkers Ju 86 prototypeJunkers Ju 87 prototype
Messerschmitt Bf 109 prototypeMiles MasterMiles Kestrel
Parnall PipitPraga E-45Renard R.31
Saro A.10Short GurnardShort Singapore
Supermarine ScapaSupermarine SouthamptonVickers F.21/26
Vickers Type 150Vickers Type 163Westland Wizard

Rolls Royce Kestrel V Specifications:

  • Type: Supercharged liquid-cooled 60-degree V12 engine with 2 valves per cylinder
  • Bore: 5 in (127 mm)                    Stroke: 5.5 in (140 mm)
  • Displacement: 1,295.88 in (21.25 L)
  • Length: 74.61 in (1,895 mm)       Width: 24.41 in (620 mm)       Height: 35.63 in (905 mm)
  • Dry weight: 957 lb (434 kg)
  • Supercharger: Gear-driven centrifugal supercharger
  • Fuel system: Rolls-Royce carburettor
  • Fuel type: 87 octane petrol
  • Cooling system: Liquid-cooled, pressurised to 300F (150C)
  • Reduction gear: Spur, 0.553:1
  • Specific power: 0.53 hp/in (24.05 kW/L)
  • Compression ratio: 6.0:1
  • Oil consumption: 0.18-0.35 oz/(hp/hr) (7-13 g/(kW/hr))

    Rolls Royce Kestrel VI

    Rolls Royce Kestrel VI
    Rolls Royce Kestrel V Power output:
    • 685 hp (511 kW) at 2,240 rpm for takeoff
    • 631 hp (471 kW) at 2,900 rpm at 14,400 ft (4,400 m)
    • Power-to-weight ratio: 0.72 hp/lb (1.18 kW/kg)

    Rolls Royce Kestrel Ib
     Aircraft Engine

    Rolls Royce Kestrel Ib Aircraft Engine

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    Rolls Royce Kestrel Aircraft Engine picture and Specifications


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