Aircraft Type Index

Aircraft Engine index



The Rolls Royce Eagle Aircraft Engine

Introduced in 1915 to power Allied Military aircraft in WW1, the Eagle was Rolls Royce's first aero-engine and was designed built somewhat reluctantly by Henry Royce who had no experience of aero-engines and only under the caveat that the could make it water-cooled. Henry Royce took personal control of the Rolls Royce Eagle development program and used his Rolls-Royce Silver Ghost car engine as a starting point, he increased its bore to 6.5 inches and increased it's number of cylinders from one row of six to two rows of six making a V12, overhead camshafts were also added to provide more power.

Rolls Royce Eagle IX Aircraft Engine


Henry Royce had been asked to deliver an engine able to produce 200hp and when first run in February 1915 the Rolls Royce Eagle exceeded this by 25hp at 1,600 rpm, it was soon realised that the engine would produce more power if run at higher RPM so production engines were rated at 255 hp at 1,800 rpm although an emergency use of 1,900 rpm was authorised for short periods producing about 270hp. The Royal Aircraft Factory's need for the engine was greater than Rolls Royce could produce, so they tried to get Henry Royce to allow the engine to be produced elsewhere under licence, but he strongly resisted, claiming the engines performance and reliability would be adversely affected. By the end of WW1 the latest versions of the Rolls Royce Eagle were producing 360 hp, development of a non military Eagle, the Rolls Royce Eagle IX continued after WW1 and at the end of the Rolls Royce Eagle engine's production run, a total of 4,681 had been produced.

Rolls Royce Cars had a reputation for unequalled reliability, quality and performance, the Rolls Royce Eagle extended that reputation in to the field of aero-engines, it was of little surprise that when the first non-stop Trans-Atlantic crossing was achieved by Atlock and Brown, Rolls Royce Eagle's powered their Vickers Vimy faultlessly the whole way.

Rolls Royce Eagle IX Specifications:

  • Type: 60° V12-cylinder overhead camshaft liquid-cooled aircraft piston engine
  • Bore: 4.5 in (115 mm)
  • Stroke: 6.5 in (165 mm)
  • Displacement: 1,239 in³ (20.32 L)
  • Length: 72.6 in (1,844 mm)
  • Width: 42.6 in (1,082 mm)
  • Height: 46.4 in (1,178 mm)
  • Dry weight: 900 lb (408 kg)
  • Fuel system: Twin Claudel-Hobson carburettors
  • Power output: 360 hp (268 kW) at 1,800 rpm
  • Specific power: 0.32 hp/in³ (13.4 kW/L)
  • Compression ratio: 5.22:1
  • Fuel consumption: 24 gallons per hour (90 Litres per hour)
  • Power-to-weight ratio: 0.40 hp/lb (0.66 kW/kg)

Aircraft that were powered by the Rolls Royce Eagle

Admiralty N.S.3 AirshipAdmiralty 23 Class AirshipAirco D.H.4
Blackburn BlackburdCurtiss H.12 Large AmericaCurtiss-Wanamaker Triplane
de Havilland D.H.10de Havilland D.H.16Dornier Wal
Fairey IIIFairey CampaniaFelixstowe F.2
Felixstowe F.3Felixstowe F.4Felixstowe F.5
Grahame-White G.W.E.7Handley Page 0/100Handasyde H.2
Handley Page H.P.18Handley Page 0/400Handley Page V/1500
Handley Page Type WHawker HorsleyPorte Baby
Porte FuryMartinsyde F.1Royal Aircraft Factory F.E.2
Royal Aircraft Factory F.E.4Royal Aircraft Factory R.E.7Short Bomber
Short N.1B ShirlShort Type 184Sopwith Atlantic
Sopwith WallabySopwith Tractor TriplaneSupermarine Commercial Amphibian
Supermarine ScarabSupermarine Sea EagleSupermarine Swan
Vickers F.B.11Vickers ValparaisoVickers Vernon
 Vickers Vimy 

Terms & Limitations of the Rolls Royce Eagle Picture use

This picture of a Rolls Royce Eagle is Copyright © June 2014 Siteseen Ltd. We only authorise non-commercial picture use and particularly encourage their use for educational purposes. This Rolls Royce Eagle picture is not in the Public Domain.

Limitations of use:

1) Siteseen Ltd. must be credited as the copyright holders wherever our copyrighted pictures or content are used.
2) For internet use, no more than three individual pictures shall be used on any given URL or website and a link back to this site must be provided.
3) Use of this Rolls Royce Eagle picture, or any of our pictures on websites re-distributing copyright free material is strictly prohibited.
Need more Information? - Visit our copyright page via our main index


Rolls Royce Eagle Aircraft Engine picture and Specifications


Free Rolls Royce Eagle Pictures - Copyright - Copy - Right - Educational - Rolls Royce Eagle - Resource - Gallery - JPEGS - Pictures - Photos - Photographs - Rolls Royce Eagle - Photos - Pic - Pics - Graphics - Vivid - Striking - Copy - Right - Detailed - Clear - Rolls Royce Eagle - JPEGS - Educational - Resource - Pic - Pics - Rolls Royce Eagle - Pictures - Images - Colorful - Beautiful - Pretty- Piture - Visuals - Rolls Royce Eagle - Pitures - Fotos - Fotographs - Graffics - Imiges - Illustrations - Pitures - Grafics - Rolls Royce Eagle - Graffics - Imiges - Prints - Free Rolls Royce Eagle Pictures - history of aircraft - aircraft pictures - plane pictures - aircraft photos - aircraft photographs - plane photos - plane pictures - plane photographs - History of Modern American Millitry Aircraft and Recognition - Warbird