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 performance shown in a table of RPM vs HP, and a detailed description of the car's electrical equipment.
| Identifier | ExFiles\Box 180\M2\M2.4\ img003 | |
| Date | 23th July 1920 | |
| Contd. -3- 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. [handwritten: X.3374.] The whole of the electrical equipment on the car includ-ing Magneto, Dynamo, Starter Motor, sparking Plugs, battery, Lamps and Switchboard are made by the S.E.V. Company, France. The Dynamo is driven through gearing off the engine. The Dynamo runs at 1.3 times the engine speed. The Dynamo commen-ces 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 how 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 small 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 [handwritten above: X.802 X.1387] very little current went through the switch. An earthed wiring scheme is used on the car; the negative side of the battery being earthed completely Contd. | ||