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 cold and hot conditions.
| Identifier | ExFiles\Box 64\1\ scan0300 | |
| Date | 28th June 1928 | |
| X7620 28.6.28. TESTS OF STARTER MOTORS ON CHASSIS. X.7620 9-EX. (4:1 Comp. ratio). Ratio 22.37 : 1. X.7625 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. 98-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 HOT : - Volts 11.0 Amperes 64.0 Engine r.p.m. 86 Motor r.p.m. 2005 X.3082. 6" dia. Motor. EFC. | ||