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 Lucas H880 starter motor.
| Identifier | ExFiles\Box 51\5\ Scan073 | |
| Date | 9th December 1921 | |
| MOTOR FORM 5. X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 9.12.21. Motor under test:- Lucas H880 No. of brake wheel - 10" No:- Weight of pan and portion of rope 5 lbs. 1 ozs. Reduction gear ratio - 1 Load in pan (W) | Spring Balance reading (S) lbs. ozs. | Speed R.P.M. | Amps. | Volts. | E.S. (W-S) (lbs) | T-t (lbs) | Torque (lb-ins) | B.H.P. | E.H.P. | Efficiency ---|---|---|---|---|---|---|---|---|---|--- 2 | 1 8 | 1890 | 102.0 | 9.96 | 8 | 5.56 | 27.8 | .84 | 1.36 | .618 1 | 1 4 | 2050 | 92.0 | 10.16 | +4 | 4.81 | 24.1 | .79 | 1.25 | .632 0 | 1 0 | 2300 | 82.0 | 10.36 | 0 | 4.06 | 20.3 | .74 | 1.14 | .649 19.5.21. | ||