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Bentley BR2
The Bentley B.R.2 was a British rotary aircraft engine developed during the First World War by the motor car engine designer W. O. Bentley from his earlier Bentley BR.1. Coming as it did near the end of the war, the BR.2 was built in smaller numbers than the earlier BR.1 – its main use being by the Royal Air Force in the early 1920s.〔Lumsden 2003, p.88.〕
==Design and development==
The initial variant of the BR.2 developed , with nine cylinders measuring for a total displacement of 1,522 cubic inches (24.9 L). It weighed , only more than the Bentley B.R.1 (A.R.1).
The Sopwith Snipe, selected as the standard single-seat fighter of the post-war RAF was designed around the BR.2 – it was also used by the ground attack version of the Snipe, the Sopwith TF-2 Salamander.
This was the last type of rotary engine to be used by the RAF – later air-cooled aircraft engines being almost entirely of the fixed radial type. The BR.2 represented the peak of rotary engine development.〔Gunston 1989, p.22.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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