Hello!
From "Notes on R.A.F. Engines. Types 4A and 5 (3rd edition) 1917.
The engine is rated 160 bhp at 1800 rpm (normal revs). It was a geared engine, gear ratio 1:2.
Quote:
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... All motors are tested for 3 hours at 1,800 R.P.M., and must give a minimum of 150 H.P. during the whole time.
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From "Air Board Engine Data Chart (Sheet 5)"
Quote:
Rated H.P. 150
Normal full speed (maximum for long periods) 1,800 R.P.M.
Maximum permissible speed (for few minutes only) 2,000 R.P.M.
Torque 437.5 lb-ft
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Both sources made available by Bletchley.
Regards,
Yavor