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During World War I several types of aircraft engines were designed and developed by the Royal Aircraft Factory, a government facility located in Farnborough, England, previously known as the HM Balloon Factory. The first of these was the RAF-1, development which began in 1913. It was an air-cooled V-8 engine based on the Renault V-8, but with larger cylinders. The design was improved in 1914 as the RAF-1a. A total of 2,860 RAF-1a engines were built between August 1914 and December 1918.

The RAF-1a powered the: Airco D.H.6; Armstrong Whitworth F.K.2/F.K.3; Avro 504K; Boulton & Paul P.6 and P.9; de Havilland D.H.51; and Royal Aircraft Factory B.E.2c/d/e, B.E.9. and S.E.5 aircraft.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa 1914 Country of Origin United Kingdom Type PROPULSION-Reciprocating & Rotary Manufacturer Royal Aircraft Factory
 Physical Description A steel propeller shaft bearing consisting of two rings with 10 steel balls between the rings. Dimensions Overall: 2.5 × 9.8 × 9.8cm (1 × 3 7/8 × 3 7/8 in.)
 Materials Steel
 Inventory Number A19640016003 Credit Line Gift of United Aircraft Corporation Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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