|Type||Manufacturer||First run|| Major applications
|| Number built
The Rolls-Royce Hawk was a British aero engine designed by Rolls-Royce in 1915. Derived from one bank of six cylinders of the Rolls-Royce Eagle, it produced 75 horsepower at 1,370 rpm. Power was progressively increased to 91 hp by February 1916, and 105 hp by October 1918.
After Rolls-Royce made the prototypes, the Hawk was manufactured under licence by Brazil Straker in Bristol between 1915 and 1918. During this period 204 engines were built, and the Hawk earned a reputation for high reliability.
Many engines of this type were used to power the SSZ class coastal patrol airships of which 76 were built.
- Avro 504F
- Farman MF.7
- Royal Aircraft Factory B.E.2
- SS class blimp (1 example)
- SSP class blimp
- SSZ class blimp
- SST class blimp
Specifications (Hawk I)
Data from Lumsden
- Type: 6-cylinder liquid-cooled inline aircraft piston engine
- Bore: 4 in (101.6 mm)
- Stroke: 6 in (152.4 mm)
- Displacement: 452.3 in³ (7.41 L)
- Length: 46.85 in (1190 mm)
- Width: 23.5 in (597 mm)
- Height: 35.5 in (902 mm)
- Dry weight: 387 lb (175.5 kg)
- Valvetrain: OHC - Overhead camshaft
- Fuel system: Twin Claudel-Hobson FZR carburettors
- Fuel type: Petrol
- Cooling system: Liquid-cooled
- Power output: 75 hp (56 kW) at 1,350 rpm
- Compression ratio: 5.1:1
- Power-to-weight ratio: 0.2 hp/lb (0.3 kW/kg)
- Comparable engines
- Related lists
- Pugh 2001, p.78.
- Lumsden 2003, p.187.
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