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).
Table of Goshawk II ignition settings showing flywheel degrees where horsepower falls off at various RPMs.
| Identifier | ExFiles\Box 37\1\ scan 230 | |
| Date | 3rd February 1922 | |
| 3949. Hs.{Lord Ernest Hives - Chair} 3.2.22. GOSHAWK II IGNITION. Degrees on flywheel at which HP. falls off advanced and retarded. R.P.M. Retarded. Advanced. Range. B.T.D.C. B.T.D.C 500 16.5° 32° 15.5° 750 22 37 15 1000 27.5 46.5 19 1250 30 50 20 1500 31.5 51.5 20 1750 33 52 19 2000 33 52.5 19.5 2250 33.5 53 20.5 2500 33.5 55 21.5 2750 35 56 21 3000 36 57 21 TCMW. | ||