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 from Brooklands tests comparing horsepower, RPM, and road speed for different engine configurations.
| Identifier | Morton\M9\ img020 | |
| Date | 19th June 1931 | |
| Hs.{Lord Ernest Hives - Chair} 400 SHEET II BROOKLANDS TESTS 19/6/31 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 45 49 18 GIV G.S.R.14 H.P. CO CLOSED ROAD WHEEL EX IN 43° 34° 10 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.{Mr Elliott - Chief Engineer} 55794 STD. CHINA R.P.M. 500 1000 1500 2000 2500 3000 3500 ROAD SPEED M.P.H. 10 20 30 40 50 60 70 | ||