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 showing the performance curves for a starter motor.
| Identifier | ExFiles\Box 34\3\ Scan171 | |
| Date | 16th June 1928 | |
| STARTER MOTOR CURVES E.H. Supplied x 1000 R.P.M TORQUE (POUND - INCHES) EFFICIENCY AMPERES X.2849 ROLLS-ROYCE LIMITED PRINT ROOM. 16 JUN 1928 | ||