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).
Engine horsepower at various RPMs and an analysis of the vehicle's electrical equipment.
| Identifier | ExFiles\Box 21\4\ Scan072 | |
| Date | 23th July 1920 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}2/LG23.7.20A REVS. HP. 500 12.56 750 14.47 1000 18.76 1250 22.07. 1500 23.08. 1750 24.59 2000 23.44 2250 18.50. ELECTRICAL EQUIPMENT: X 3374 (crossed out) The whole of the electrical equipment on the car including Mageto, Dynamo, Starter, Motor, Sparking Plugs, Battery, Lamps, and Switchboard are made by the S.E.V. Co. France. The Dynamo is driven through gearing off the engine. The Dynamo runs at 1.3 times the e gine speed. The Dynamo commences to charge when the engine is turning 400 R.P.M. On the road it cuts in at about 10 M.P.H. The dynamo is very good for silence. As the engine and gearbox are all in one unit, it is impossible for us to see the mechanism for operating the Starter but by the way it worked one would say that a Bendix pinion was used. The Starter was operated and engaged by pressing a small button on the switchbox. The actual press button switch was a remarkably smal and cheap fitting. It was simply two carbon contacts - one fitted to a spring blade. We operated the Starter a number of times with the press button switch exposed. One could tell by the sparking that only very little current went through the switch. An earthed wiring sceme is used on the car, the negative side of the battery ebing earthed completely so that the heavy starter current as well Contd. | ||