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 note detailing the electrical specifications for the battery, ignition system, and Klaxon horn.
| Identifier | ExFiles\Box 51\2\ Scan108 | |
| Date | 20th February 1923 guessed | |
| -2- Contd. Battery. The ampere-hour capacity of the battery provided is 45 to 50 on the 10 hour rate. The battery when fully charged is capable of supplying a current of 105 amperes continuously for 5 minutes. Battery Ignition. The normal running current of the battery ignition at average speeds is rather less than 1 1/2 amperes. In estimating the output of the dynamo from the ammeter reading, with no lights or other apparatus switched on, it is necessary to add this amount. The hand advance of this ignition allows for 20° on the distributor or 40° on the engine. The automatic advance allows for 15° on the distributor or 30° on the engine. With both ignitions retarded firing occurs 26° after dead point. With both ignitions fully advanced it occurs 44° before dead point. Klaxon Horn. This requires a current of 5 amperes, but being in operation for such a small percentage of the total time the amount is considered to be of little importance. E.F.C. EFC. {E. Fowler Clarke - Electrical Engineer} | ||