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).
Technical details on S.U. Electric Petrol Pumps, including power absorption, winding particulars, and temperature effects.
| Identifier | ExFiles\Box 163\1\ img010 | |
| Date | 18th September 1933 | |
| 86007 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. Hs{Lord Ernest Hives - Chair}/Wst.6/MA.18.9.33. S.U. ELECTRIC PETROL PUMPS. We give below a few technical details regarding the above pumps. (1) Electrical Power absorbed. This, even with the maximum delivery of 120 pints per hour, would only amount to approx. 7 watts per hour which represents about the equivalent of ½ ampere continuous drain on the battery. (2) Winding particulars. Wound with 24 S.W.G. enamelled copper wire. 13 layers, total weight of wire ¼ lb. Resistance (cold) approx. 5 ohms. This winding is shunted by a high resistance "Eureka" wire winding having a resistance of approx. 88 ohms. The object of this resistance is to damp out sparking at the contact breaker points. (3) Temperature effect. There is an inherent temperature rise in the pump itself and this temperature rise affects the pump delivery, partly by reducing the magnetic pull and by the volatility of the petrol. We attach curves shewing delivery against temperature measured on the pump carcase. Hs{Lord Ernest Hives - Chair}/Wst. | ||