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 graph plotting Road Wheel Horsepower against RPM and Road Speed for different engine configurations.
| Identifier | ExFiles\Box 29\3\ Scan327 | |
| Date | 19th June 1931 | |
| SHEET II, Hs.{Lord Ernest Hives - Chair} 400, 4.00 (crossed out), BROOKLANDS TESTS 19/6/31, LAP SPEEDS C.O. CLOSED 18 GW 68.7 M.P.H., G.S.R.14 63.2 M.P.H., 18 GW 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., 11°, EX., IN, 49°, 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, 10°, EX., IN, 43°, 34°, ROAD WHEEL H.P. C.O. CLOSED, R.P.M., ROAD SPEED M.P.H., Curve label: 18 GW, Curve label: G.S.R.14 | ||