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).
Development and testing of two brake servo schemes.
| Identifier | ExFiles\Box 73\2\ scan0279 | |
| Date | 10th March 1924 | |
| X.9940 To HS.{Lord Ernest Hives - Chair} & ST.{Capt. P. R. Strong} FROM R.{Sir Henry Royce} c. to CJ. BJ. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} RG.{Mr Rowledge} BY.{R.W. Bailey - Chief Engineer} Mr. Claremont. S E C R E T. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. RE. BRAKE OPERATION. X.9940 Don't lose time but concentrate on 2 schemes only and look out for Mr. Claremont's advice as regards patents. (1) R.R.M scheme. (2) Single ratchet operating lever side of servo. Both these will admit of a fairly large angle of servo operating which would naturally make them slower and more gentle than a small angle of operation (like the Hispano) but suits us far better because of the light loads and ease of operating. There is no lost time with either scheme if correctly arranged and speeded, but our schemes have definite advantages to us (as well as patents) and should be pushed with all the energy possible. DA.{Bernard Day - Chassis Design} must give promptly the simple modifications necessary for Hs.{Lord Ernest Hives - Chair} to test and the worm should have 2 or 3 alternatives in speed, 2 at first which will shew which way to go - I think 10 to 1 and 20 to 1. Let your servo clutch turn in each case at least 60°. You will see that the pedal pressure will take up the slack directly in the back and at the same time the clutch will take up the slack in the front unless the separating springs between the servo plates were unnecessarily strong. Wear of front brakes can be easily tested by touching the front levers on the axle which will be necessary to see if they are working freely. R.{Sir Henry Royce} | ||