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 description of the actuator box, motor gearing, and lamp specifications.
| Identifier | ExFiles\Box 61a\1\ scan0046 | |
| Date | 26th May 1919 | |
| Contd. 1357 -3- EFC7/T26.5.19. At the same time this relay current passes through magnet coils of an actuator box. The relay current in the coils of the main switch cause the heavy current motor circuit to be closed through contacts of ample area. In passing through the three other magnet coils which it causes, by means of a suitable mechanism, the motor to be put into gear with the engine through the gear box. There is a reduction gear built on to the motor as part of it, of 6 to 1. The motor then drives through a chain to the gear box with a reduction of 14 to 13, then the power passes through an epicyclic gear of the gear box which gives a further reduction of 6 to 1, finally the power is transferred to the engine through a pair of gears in the box giving a speed increase of 5 to 3. The total reduction from the motor to the engine is 23.3, so that when the motor speed is 1,000, the engine speed is 43 R.P.M. The starting current drawn by the motor from the battery is in the neighbourhood of 100 amperes. LAMPS.- There will be, as usual, two head lamps, two side lamps and a tail lamp, which, however, we do not supply as part of the chassis, but so far as we can say at present, we shall recommend to be Lucas lamps. EFC. | ||