|Preserved Rolls-Royce Hawk|
|Type||Liquid-cooled inline piston engine|
|Major applications||SSZ class blimp|
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
Post war one engine (serial number 332) was fitted into a specially built hull and launched on Windermere in 1922 with the name Canfly. With a flywheel added it was directly connected to the boat's propeller without a gearbox. Capable of reaching speeds of 26 knots (30 mph; 48 km/h) Canfly was used as the official's boat at several world speed record attempts during the 1920s and 1930s. The boat and engine are now displayed in a working but non-operational state at the Windermere Jetty museum.
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)
- Pugh 2001, p.78.
- "Canfly". Windermere Jetty: Museum of Boats, Steam and Stories. 2019. Retrieved 30 April 2019.
- Lumsden 2003, p.187.
- Flight 7 May 1954
- British Airships
- 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. Duxford, Cambridge: Icon Books, 2001. ISBN 1-84046-151-9.
- Taulbut, Derek S. Eagle – Henry Royce’s First Aero Engine, Rolls-Royce Heritage Trust, 2011. ISBN 978-1-872922-40-9.
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