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 pull-in voltage, current consumption, and temperature rise for three different tap models.
| Identifier | ExFiles\Box 163\1\ img052 | |
| Date | 1st April 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/RC.{R. Childs}8/JH.1.4.39. No.1120.X. Pull in - 6.0 volts. Current at 12 volts - 0.98 amperes. The above values obtained cold, no pumps connected. In order to check temperature rise, two of the taps were connected to a 12 volt supply for a period of 30 minutes, at the end of this time the operating voltage and current consumptions were as follows - No.800.X. Pull in - 7.35 volts. Current at 12 volts - 1 ampere. Temperature rise - 74.8°C. No.1120.A. Pull in - 6.75 volts. Current at 12 volts - 0.75 amperes. Temperature rise - 66.6°C. The above temperature rise is only given for comparison purposes, under normal conditions it will be appreciably lower due to the petrol passing through the tap. A further test proved the absence of any leakage at the valve seating. Attached are curves showing pressure on the seating against voltage across the coil. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||