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).
Power curve graph for a Phantom III engine with a standard exhaust silencer, showing BHP, MEP, and MPH against engine RPM.
| Identifier | ExFiles\Box 92\6\ scan0003 | |
| Date | 12th June 1936 guessed | |
| POWER CURVE STD PH III AND EXHAUST SILENCER 7 X 18 90 TYRES 4.25 : 1 AXLE RATIO RPM - M.P.H. B.H.P. M.P.H. M E P LBS / ☐' BHP MILES / HR ENGINE R.P.M. Left Y-Axis (BHP): 90, 100, 110, 120, 130, 140, 150, 160 Left Y-Axis (MPH): 20, 30, 40, 50, 60, 70, 80, 90 Right Y-Axis (MEP): 50, 60, 70, 80, 90, 100, 110 Bottom X-Axis (RPM): 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 Secondary X-Axis (Miles/Hr): 15, 25, 35, 45, 55, 65, 75, 85, 95 | ||