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).
Power curve comparison chart showing BHP vs RPM for a 1G.T. engine with two different valve timing configurations.
| Identifier | ExFiles\Box 48\4\ Scan100 | |
| Date | 20th December 1923 guessed | |
| POWER CURVE COMPARISON X AVERAGE GOSHAWK II o BEST INLET & EXHAUST TIMINGS ON 1G.T. ENGINE 1G.T. ENGINE TEMP. 80°C. B.H.P. R.P.M. BEST INLET & EXHAUST TIMINGS COMBINED I.C. 32° I.O. 5° E.O. 42° E.C. AVERAGE GOSHAWK II TIMING I.C. 43° I.O. 12° E.O. 59° E.C. 5° TAPPET CLEARANCE .010". N.B. ENGINE ROARS SLIGHTLY WITH GOSHAWK II TIMING. ENGINE DOES NOT ROAR WITH OTHER TIMING. | ||