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).
Graph comparing road wheel horsepower against engine RPM from Brooklands and China unit tests.
| Identifier | ExFiles\Box 181\M9\ img020 | |
| Date | 19th June 1931 | |
| SHEET II BROOKLANDS TESTS 19/6/31 LAP SPEEDS C.O. CLOSED 18 GIV 68.7 M.P.H. G.S.R.14 63.2 M.P.H. 18 GIV 35.7 CWTS JAPAN UNIT C/R 5.25 PIT SILENCER TWIN ZENITH 26 M.M. CHOKES 112 CAMSHAFT C.O. CLOSED. T.D.C. EX IN 49 49 11 ROAD WHEEL H.P. C.O. CLOSED G.S.R.14 18 GIV G.S.R. 14 33.7 CWT CHINA UNIT C/R 5.25 17% LARGER R.R. CARB. C.O. CLOSED 110° SHAFT EX. SYSTEM ARRGT. E/55794 STD. CHINA EX IN 43° 34° 10 R.P.M. ROAD SPEED M.P.H. Axis Labels: 0, 10, 20, 30, 40, 50, 60, 70, 80 RPM: 500, 1000, 1500, 2000, 2500, 3000, 3500 Road Speed MPH: 10, 20, 30, 40, 50, 60, 70 Hs.{Lord Ernest Hives - Chair} 400 | ||