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).
Dynamometer graph showing road wheel horsepower against engine RPM for various vehicle configurations.
| Identifier | ExFiles\Box 109\4\ scan0121 | |
| Date | 29th June 1939 | |
| ROAD WHEEL DYNO H.P CHASSIS 30 G 7 ENGINE UNIT B 80 Nº 5 (BUICK TYPE EXH. AND AIR SILENCERS.) AXLE RATIO 11 41 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 RM{William Robotham - Chief Engineer}/TAS{T. Allan Swinden}/29.6.39. | ||