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 plotting Brake Horsepower and Brake Mean Effective Pressure against engine RPM from Brooklands tests.
| Identifier | Morton\M9\ img022 | |
| Date | 19th June 1931 | |
| SHEET I HS{Lord Ernest Hives - Chair}402 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. OPEN. 18G IV 70.64 M.P.H. 16G IV 69.66 18G IV 35.7 CWTS. JAPAN UNIT C/R.{Sir Henry Royce} 5.25 TWIN ZENITH 26MM CHOKES 112° CAMSHAFT OPEN EXHAUST T.O.C. 11 49 49 16G IV 31.8 JAPAN UNIT C/R 5.25 46% LARGER R.R. CARB. 110° CAMSHAFT OPEN EX. 10° .013 CLCE CAR WT. EX 43 34 B.H.P. B.M.E.P. ENGINE R.P.M. ROAD SPEED M.P.H. | ||