Rolls-Royce Hawk

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Rolls-Royce Hawk duxford.JPG
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

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]

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.


Specifications (Hawk I)[edit]

Data from Lumsden[2]

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)



See also[edit]

Comparable engines
Related lists



  1. ^ Pugh 2001, p.78.
  2. ^ 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.

External links[edit]