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).
Four-wheel brake issues and a fatigue fracture of a cross steering tube.
| Identifier | ExFiles\Box 182\M20\M20.2\ img038 | |
| Date | 1st May 1924 | |
| R.R. 493A (SOH) (D.A. 652 20-3-24) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. 9940 9420 REF: Hs{Lord Ernest Hives - Chair}1/LGS.5.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RO.{C. C. Rose - Export Manager} c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} Woy. S E C R E T. FOUR WHEEL BRAKES. It is noticeable on 40/50 HP. cars which have covered any mileage fitted with 4-wheel brakes, that the rear brake drums become badly scored. When they get in this condition we have trouble with squeaking and ineffective brakes. On a car which has just returned from running in France, it has been necessary to true up both rear brake drums. This is the second case we have had. With the foot operated rear brakes, we never have any trouble with the brake drums. The unit pressure on the brake drums is higher than the Hispano. On the chassis on which we have been carrying out all our jaggering tests, the cross steering tube broke in the centre. It appears to be a fatigue fracture. The brake tests on this car have all been carried out with axles to give centre-point steering. We will bring this tube to W.W. Hs.{Lord Ernest Hives - Chair} | ||