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 of Road Wheel Dynamometer Horsepower against Engine RPM for various exhaust and fan configurations.
| Identifier | ExFiles\Box 125\3\ scan0136 | |
| Date | 29th June 1939 | |
| ROAD WHEEL DYNO H.P. CHASSIS 30 G 7 ENGINE UNIT B 80 Nº 5 AXLE RATIO 11 41 (BUICK TYPE EXH. AND) {AIR SILENCERS.} FIGURES OBTAINED IN DIRECT GEAR ON DUNLOP TRACK RACING TYRES @ 45 LB/IN² B.H.P. CORRECTED TO 50°C AIR TEMP. ENGINE R.P.M. APPROX. M.P.H. WITH 7.50 x 16 TYRES. 11.41 AXLE, & DIRECT GEAR. OPEN EXHAUST NO FAN SILENCED NO FAN COMPLETE MOTOR CAR | ||