From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance comparison table for the Eagle, Falcon, and Hawk aero engines.
| Identifier | ExFiles\Box 36\2\ scan 067 | |
| Date | 24th November 1916 | |
| X.2935. Re Memo R6/W24.11.16. X.2437. X.2935. X.2965. Engine. Speed. HP. corres. to M.M.P. of 120 lbs/sq.in. Reduction Ratio. Lbs. lifted on Dynamometer No. 2. Eagle. 1600 301 .64 529 Falcon 1800 237 .59 401 Hawk 1500 103 1.00 123 | ||