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).
The performance of engine controls, including the governor and ignition system.
| Identifier | ExFiles\Box 69\3\ scan0026 | |
| Date | 19th January 1925 guessed | |
| - 2 - (2) ENGINE CONTROLS - The governor was found to be very stiff and sticky and could not be relied on to maintain a constant speed. It was assumed that this was merely a matter of fitting, but as it is understood that the throttle is quite different to that of the 40/50 this should be closely investigated. It was found that the governor range was very small indeed, the maximum speed which could be attained by hand control being 16 m.p.h. on second and 19 on third, but the governor lever had to be placed half way up the quadrant, or more, to keep the engine slowly running under traffic driving conditions, so that roughly speaking only half the range on the quadrant was being used. It would therefore appear possible to increase the range of the governor, and this is considered desirable. The ignition controls are an improvement on those fitted on 93-NK as it is possible to run the engine from the main control on either magneto only, battery only, or magneto and battery, but it is a question for decision whether the four variations available are the four best. Ignition. Four positions are available. Off these, two must be taken by OFF, and Magneto and Battery and charge, as the latter will be the normal running conditions. There are thus two left which may be any two of the following five:- B., B & C., M.{Mr Moon / Mr Moore}, M & C., M & B. One, at least, of, of these should be without the dynamo charge. So we must select one, at least, from:- B., M.{Mr Moon / Mr Moore}, M & B and one probably from:- B & C., M & C. As regards the latter, as current is being used with B and not with M - B & C appears preferable. As it may be desirable not to charge all day on long high speed runs, and as M is most suitable Contd. | ||