Rolls-Royce Hawk

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.[1]

Hawk
Preserved Rolls-Royce Hawk
Type Liquid-cooled inline piston engine
Manufacturer Rolls-Royce Limited
First run 1914
Major applications SSZ class blimp
Number built 205

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.

Applications

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.[2]

Specifications (Hawk I)

Data from Lumsden[3]

General characteristics
  • 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)

Components

Performance

See also

Comparable engines

Related lists

References

Notes
  1. Pugh 2001, p.78.
  2. "Canfly". Windermere Jetty: Museum of Boats, Steam and Stories. 2019. Retrieved 30 April 2019.
  3. Lumsden 2003, p.187.

Bibliography
  • 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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