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).
Advantages of a slow speed ratchet driven servo for vehicle braking systems.
| Identifier | ExFiles\Box 72\3\ scan0007 | |
| Date | 27th January 1924 | |
| X9440 From R.{Sir Henry Royce} from CJ. c. to Hs.{Lord Ernest Hives - Chair} RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} EJ. PN.{Mr Northey} Wor.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} La{L. A. Archer} Villa Mimosa, Le CanadelHenry Royce's French residence, Par le Lavandou, Var, France. X. 9940 E.{Mr Elliott - Chief Engineer} 9410 27.1.24. Dear CJ., Although there is some hope in the metal lined high speed servo, I think that 'since we now know' the many advantages of coupling all the brakes together and operating them by a foot assisted slow speed ratchet driven servo we ought to go for this scheme all out for the conversion as well as (? 'those schemes' C.J.) already arranged for EAC.4. and recently for EAC.1. I have an impression that we may not yet have the best combination and proportion of this less costly scheme of conversion, but I fear that we may never get real satisfaction until we have a slow speed servo which now appears to me to be indispensable because it is the simplest means of insuring:- (1) Moderation in the speed of application of both the front and back brakes and so avoiding the two troubles of 'jaggers' and also 'chunking' so christened. (2) The combinations should give cool and constant working of the servo. (3) With the equalizing floating lever suggested by me we should get consistently proportioned braking between front and back. Moderating the speed of application is the point I do not think we can get with any other means that is as simple and reliable. When we have finished I am not sure we shall hold the car backwards on a 1 in 5 incline without using the hand brake. I do not know if PN.{Mr Northey} has tried the Hispano in this way. XXX. We shall be doing nothing more or less than in the past for equalising from side to side of the car which may arise from oily, worn or destroyed brakes or errors caused by rusted up operating mechanism. As regards the breakage of front spring I think our springs are as large as others. I cannot see any way of making them better, (we send out more flex. front springs contd..- | ||