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).
Brake test results for a Goshawk starter motor.
| Identifier | ExFiles\Box 35\4\ scan 100 | |
| Date | 2nd February 1922 | |
| MOTOR FORM 5. A.3009. BRAKE TEST OF STARTER MOTOR. Date:- 2-2-22 Motor under test:- Goshawk Dia. of brake wheel - 10" No:- 1 Weight of pan and portion of ropes = 5 lbs. 0 ozs. Reduction gear ratio - TABLE DATA: Column Headers: Load in pan (W) lbs. Spring balance reading. (B) lbs. ozs. Speed R.P.M. Amps. Volts. W-B (lbs) T-t (lbs) Torque (lb-ins) B.H.P. E.H.P. Efficiency. Row 1: Speed R.P.M.: 1670, Amps.: 64.0, Volts.: 10.72, Torque (lb-ins): 20, B.H.P.: .58, E.H.P.: .92, Efficiency: .58 Row 2: Speed R.P.M.: 1350, Amps.: 82.0, Volts.: 10.36, Torque (lb-ins): 30, B.H.P.: .864, E.H.P.: 1.06, Efficiency: .60 Row 3: Speed R.P.M.: 1100, Amps.: 98.0, Volts.: 10.04, Torque (lb-ins): 40, B.H.P.: .70, E.H.P.: 1.31, Efficiency: .535 Row 4: Speed R.P.M.: 900, Amps.: 116.0, Volts.: 9.68, Torque (lb-ins): 50, B.H.P.: .715, E.H.P.: 1.50, Efficiency: .48 Row 5: Speed R.P.M.: 730, Amps.: 132.0, Volts.: 9.36, Torque (lb-ins): 60, B.H.P.: .695, E.H.P.: 1.66, Efficiency: .42 Row 6: Speed R.P.M.: 560, Amps.: 148.0, Volts.: 9.04, Torque (lb-ins): 70, B.H.P.: .62, E.H.P.: 1.79, Efficiency: .345 Row 7: Speed R.P.M.: 450, Amps.: 165.0, Volts.: 8.70, Torque (lb-ins): 80, B.H.P.: .57, E.H.P.: 1.92, Efficiency: .30 19-8-21. | ||