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).
Observations from the initial trial of the EAC.II silent starter gear units in the electrical laboratory.
| Identifier | ExFiles\Box 64\3\ scan0188 | |
| Date | 4th November 1924 | |
| X8650 EFC4/T4.11.24. X.8650. EAC.II SILENT STARTER GEAR. OBSERVATIONS OF FIRST SET OF SILENT STARTER GEAR UNITS WHICH WE HAVE HAD FOR TRIAL IN OUR ELEC. LABORATORY. The initial teazer heavy current is 13.5 amperes. at 12 volts; 11.5 amperes at 10 volts. It is thought that for the motor to operate satisfactorily at slow speeds, it requires about 16 amperes (at 11 volts, say). So far as can be judged on the bench, the actuator box itself appears to be O.K. as regards pull. The main switch contacts appear to have no difficulty in conveying the necessary current. The sparking at the actuator box contacts appears reasonable (when breaking the parallel circuit of the main switch coil and nichrome resistance). The initial motor current through the main switch winding is ample for operating the relay switch. The hold-on coil takes about 2 1/2 amps. at 10 volts. but does not seem too certain of holding on. A heavier winding seems to be desirable. MADE AT CROXLEY EFC. | ||