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 power curves for the Bentley V - 7 B.V model.
| Identifier | ExFiles\Box 158\2\ scan0028 | |
| Date | 3rd May 1939 | |
| BENTLEY V - 7 B.V ROAD WHEEL DYNO POWER CURVES 7 B V POWER AT DRUMS, HUBS, AND CLUTCH CURVES TAKEN ON NEW INDIA TYRES @ 46 LB/IN² B.H.P. CORR. TO 40°C INLET AIR TEMP. M.P.H. WITH RESPECT TO INDIA TYRES - ROLLING CIRCUM. 89" @ 46 LB/IN² ENGINE R.P.M. OVERDRIVE 1.2 : 1 DIRECT GEAR A - H.P. AT DYNO DRUM SURFACE TAKEN IN OVERDRIVE B - AS A BUT TAKEN IN DIRECT GEAR C - HUB H.P. (NEGLECTING REAR AXLE LOSS) = DYNO H.P. + DYNO LOSS + TYRE LOSS. THIS CURVE BASED ON FIGURES OBTAINED IN OVERDRIVE D - AS C BUT BASED ON DIRECT GEAR FIGURES E - CLUTCH H.P. (APPROX.) FROM TEST BED RM{William Robotham - Chief Engineer} / TAS{T. Allan Swinden} / 3 - 5 - 39 | ||