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).
Test results for starter motors on a chassis under hot and cold conditions.
| Identifier | ExFiles\Box 64\2\ scan0162 | |
| Date | 28th June 1928 | |
| X7625 28.6.28. TESTS OF STARTER MOTORS ON CHASSIS. X7620 9-EX. (4:1 Comp. ratio). Ratio 22.37 : 1. X7625 COLD :- Volts 9.62 Amperes 94.0 Engine r.p.m. 53 Motor r.p.m. 1185 HOT :- Volts 10.4 Amperes 73.2 Engine r.p.m. 75 Motor r.p.m. 1676 G2 MOTOR. ----------------- 95-NK. (4 : 1 Comp. ratio). Ratio 23.3 : 1 COLD :- Volts 10.27 Amperes 77.2 Engine r.p.m. 68 Motor r.p.m. 1584 X.3082. 6" dia. Motor. HOT :- Volts 11.0 Amperes 64.0 Engine r.p.m. 86 Motor r.p.m. 2005 ------------- EFC. | ||