RAF 4

The RAF 4 is a British air-cooled, V12 engine developed for aircraft use during World War I. Based on the eight–cylinder RAF 1 it was designed by the Royal Aircraft Factory but produced by the two British companies of Daimler and Siddeley-Deasy. The RAF 5 was a pusher version of the same engine.Gunston, 1989, p. 156.

Turbocharger A turbocharged experimental version of the RAF 4, the RAF 4d, was developed using a Rateau exhaust-driven turbocharger. The engine was test-flown in a R.E.8, but the turbocharging experiments were abandoned after the turbine failed on 4 May 1918.Hare 1990, p. 265

Variants RAF 4 1914 - Prototype engine, 140 horsepower (104 kW). RAF 4a 1917 - Main production variant, 150 horsepower (112 kW). 3,608 built. RAF 4d 1916 - 180 horsepower (134 kW), experimental supercharger installation. 16 built. RAF 4e 1917 - 240 horsepower (180 kW), strengthened cylinders and enlarged valves. RAF 5 1915 - 150 horsepower (112 kW), pusher version with fan-cooling. RAF 5b 170 horsepower (127 kW), increased bore version of RAF 5.

Applications

RAF 4

Armstrong Whitworth F.K.8 Bristol F.2 Fighter Royal Aircraft Factory B.E.12 Royal Aircraft Factory R.E.7 Royal Aircraft Factory R.E.8 Siddeley-Deasy R.T.1 Vickers F.B.14

RAF 5 Royal Aircraft Factory F.E.2 Royal Aircraft Factory F.E.4

Engines on display A preserved RAF 4a engine is on public display at the Science Museum (London).

Specifications (RAF 4a)

RAF 4

Bron en licentie