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 M. DES. 60 braking scheme, detailing a fault with the servo, modifications tested, and a comparison with other four-wheel brake systems.
| Identifier | Morton\M20.2\ img027 | |
| Date | 28th April 1924 | |
| B.E. 493A (20H) (D.A. 652 20-9-24) J.H.D. To R fan Hs{Lord Ernest Hives - Chair} CCJ RG{Mr Rowledge} TA E BY Wor{Arthur Wormald - General Works Manager} Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG28.4.24. EXPERIMENTAL REPORT. M.{Mr Moon / Mr Moore} DES. 60 SCHEME. This scheme has a similar fault to the 'agreed' scheme caused by the proportion of braking by the servo being so much greater than that obtained by the direct foot pedal pressure. In the case of this design, with the external pegs on the servo plate to operate the levers one can easily see the exact time the servo pressure comes on. We find in this case that if the brake pedal is operated quickly so that it gets in front of the servo, when the servo comes on the car pulls up with a jerk. This car has also been improved by reducing the power of the servo. We have also tested on this scheme, face cams in place of screw thread, and other slight modifications to reduce the friction. GENERAL. We have now three examples of cars with four-wheel brakes - "Agreed" - M.{Mr Moon / Mr Moore} DES. 60 - RRM. - any one of which compare very favourably with the Hispano, but the RRM. at present is certainly the best and the most simple. Hs.{Lord Ernest Hives - Chair} | ||