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 from Brooklands tests comparing Clutch HP and B.M.E.P. for two different vehicle configurations.
| Identifier | Morton\M9\ img021 | |
| Date | 19th June 1931 | |
| H.S. 401 H.S.401 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. CLOSED 18GW 68.7 M.P.H. G.S.R.14 63 M.P.H. -- (Dashed line curve details) -- 18GW 35.7 CWTS JAPAN UNIT TWIN ZENITHS 26 M/M CHOKES 112° CAMSHAFT PII REAR SILENCER & FISHTAIL TIMING SEE SHEET 2 C.O. CLOSED -- (Solid line curve details) -- 14 G.S.R. 33.7 CWTS CHINA UNIT C/R 5.25 17% LARGER R.R. CARB. C.O. CLOSED 110° SHAFT STD. 25 H.P. SYSTEM E.55794 -- (Axes Labels) -- CLUTCH H.P. B.M.E.P. ENGINE R.P.M. ROAD SPEED M.P.H. | ||