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 showing the effect of rear axle loading on horsepower lost in tyres versus speed.
| Identifier | ExFiles\Box 158\2\ scan0045 | |
| Date | 17th May 1939 | |
| 12 TESTS ON 2 REAR WHEELS ON DYNO DRUMS EFFECT OF REAR AXLE LOADING NEW DUNLOP FORT TYRES @ 32 LBS/IN² CURVES TAKEN AT FULL THROTTLE IN DIRECT GEAR HP LOST IN TYRES M.P.H. APPROX AXLE LOAD 1920 LBS 1320 LBS 460 LBS RM{William Robotham - Chief Engineer}/TAS{T. Allan Swinden}/17.5.39 | ||