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 report on the operating voltage and current consumption of an automatic solenoid choke control.
| Identifier | ExFiles\Box 122\4\ scan0215 | |
| Date | 29th November 1938 | |
| -1036- To By/RD. c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/RC.{R. Childs}15/JH.29.11.38. AUTOMATIC SOLENOID CHOKE CONTROL. We obtained one of the above units from Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} and tested it for operating voltage and current consumption. From the test, on this particular solenoid, it would not be necessary to switch on first before pressing the starter button as the battery, in its normal state, will not drop below 6 volts, also, on the valve being fully opened, it would not close again owing to the very low voltage required to hold it open after the initial operation. First, readings were taken to determine the voltage necessary to just lift and drop the plunges, an average of 10 readings gave the following results. Volts. To open Volts. To close. Current. on Opening. 5.41 4.77 .3836 Readings were next taken to find the voltages required for just opening, half way open, and fully open. The results were as follows - Just Open Half Open Fully Open. Volts. (5.45 5.9 5.95 (5.48 5.9 5.95 (5.50 5.72 5.9 With the valve fully open, the voltage was reduced until the valve just closed, this was found to be 1.35 volts. The current consumption of the solenoid at 12 volts was found to be .82 amperes. We should try one or two of these in order to obtain an average figure. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||