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).
Performance and efficiency calculations for a Lucas M45G motor.
| Identifier | ExFiles\Box 165\7\ img028 | |
| Date | 28th May 1910 guessed | |
| Lucas M45G motor Torque 10 lbs ft. Amps 300 Volts 8. Speed 750. Input = 300 x 8 = 2400 watts = 3.22 HP. Output = (10 x 750 x 44) / (7 x 33000) = 300 / 210 = 1.43 HP. eff of motor = 1.43 / 3.22 = 44%. ∴ @ 10 lbs ft eff = 44%. Torque 8 lbs ft. Speed 950 RPM. current 260 volts 8.4 Input = (260 x 8.4) / 746 = 2.93 HP. Output = (8 x 44 x 950) / (33000 x 7) = 152 / 105 = 1.45 eff = 1.45 / 2.93 = approx 50% [Right side faint calculations] In = (200 x 9.2) / 746 = 2.4 O = (6 x 44 x 1225) / (33000 x 7) = (8 x 1.225) / 7 = 1.4 HP eff = 1.40 / 2.85 = 49.2% [Right side numbers column] 950 1650 2250 | ||