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GB, I think that the Air Board data would have been recorded in a consistent way, and I am fairly sure that the figures for rotary engine hp would have been without any losses for windage. Andrew Nahum ('The rotary aero engine', HMSO, 1987) quotes S D Heron, who was with the RAE/AID at Farnborough, as saying that the 'rotary engine builders objected strenuously to the power of their engines being determined on the dynamometer. They insisted that torque stands should be used. On a torque stand, the very considerable windage loss due to rotating the cylinders was recorded as useful horsepower'. I think this must have become the standard way of recording output from rotary engines.
Bletchley
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