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).
Heating test report for actuator coils with results for various timings and conditions.
| Identifier | ExFiles\Box 34\3\ Scan057 | |
| Date | 16th April 1939 | |
| -3- Heating Test of Actuator Coils (400 x 2 turns). Time (mins). Amps. Volts. Ohms. 0 6.20 10.80 1.74 .5 6.00 10.70 1.78 1.0 5.80 10.73 1.85 1.5 5.70 10.73 1.88 2.0 5.60 10.75 1.92 3.0 5.43 10.80 1.99 4.0 5.30 10.80 2.04 5.0 5.20 10.83 2.08 Temp. rise = (approx) 50°C, final temp.(say) 65°C after 5 mins application of current from 12 volt battery. If the push button switch was "on" for 3 minutes, i.e. current reduced to 5.43 amps. maximum load lifted by arm = 5 lb. 4 ozs. (approx). - Effect of slowly pressing on P.B. Switch - 400 x 2 turns actuator box and main switch in parallel across terminals of 12 volt battery. Coils warm. 1. Lighting carbon contact, current = 5.50 amps. Full " " " = 6.50 " " copper & Carbon contact, " = 6.90 " Coils cold. 2. Light carbon contact, current = 5.90 amps. Full " " " = 6.90 " " copper & carbon contact, " = 7.20 " Cont'd | ||