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 data sheet for the Coshawk 11, detailing average production results from January 1923.
| Identifier | ExFiles\Box 74\4\ scan0183 | |
| Date | 27th March 1923 | |
| X4134 27.3.23. GOSHAWK 11. M.E.P's. H.P. figures taken from average production results Jan.1923. | R.P.M. | Clutch B.H.P. | Road wheel H.P. | Clutch M.E.P. | Road wheel M.E.P. | |---|---|---|---|---| | 500 | 10.25 | 8.9 | 85.5 | 73.8 | | 750 | 16 | 13.9 | 88.5 | 76.8 | | 1000 | 21.5 | 18.31 | 89.2 | 74.8 | | 1250 | 26 | --- | 86.3 | ---- | | 1500 | 30.75 | 25.9 | 85.0 | 71.5 | | 1750 | 36 | --- | 85.0 | ---- | | 2000 | 40.7 | 32.9 | 85.0 | 68.1 | | 2250 | 44.5 | --- | 85.0 | ---- | | 2500 | 48 | 35.47 | 79.8 | 58.8 | | 2750 | 50.5 | 33.4 | ---- | 50.3 | | 3000 | 51 | --- | 69.8 | ---- | Dynamometer H.P. of 6 Cars in month ending 14th. Feb. 1923. Bench H.P. from Experimental & Production Unit Test. Rm.{William Robotham - Chief Engineer} | ||