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).
4-wheel brakes, servo output, and low-speed steering wobbles.
| Identifier | Morton\M20.3\ img031 | |
| Date | 26th June 1924 | |
| R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. -2- Expl. No. 9940 REF: HsS/LG26.6.24. EXPERIMENTAL REPORT. In the instructions being got out for 4-wheel brakes we are recommending that drivers should always practise re- leasing the brakes when actually turning a corner. We are finding that servos, on the average, are giving consistently a bigger output than the first one we measured. We therefore recommend reducing the amount of front braking by altering the lever on the front equaliser from 2.8 to 2.4. This will ensure that with the new value for the servo we shall not get more than 4 to 6 ratio on the front. We attach herewith chart which shows the proportion of braking with various values for the servo output. Both cars in France had complaints of low speed steering wobbles. Plain friction washers have been fitted to both pivots on each of the cars. The wobbles are brought up worse on the HAC.111 cars we owing to the weaker springs in the side steering tube for reducing road shocks. With the standard springs in the side steering tube, the steering wobbles dis- appear but the road shocks felt on the steering wheel are increased considerably. Hs.{Lord Ernest Hives - Chair} | ||