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).
High-speed steering wobbles investigating the effects of Michelin wheels and centre-point steering.
| Identifier | ExFiles\Box 28\4\ Scan360 | |
| Date | 29th August 1925 | |
| R.R. 498A (50 H) (D.D. 31. 12-6-25) J.H.D. Expt. No. 4457 REF Hs{Lord Ernest Hives - Chair}5/LG29.8.25. EXPERIMENTAL REPORT. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} HIGH SPEED STEERING WOBBLES. 4457 √B6682 We have carried out tests on the axle with a vertical pivot fitted with Michelin wheels giving true centre-point steering. We arranged weights on the extremities of the axle (which was not fitted with front wheel brakes) so that its transverse moment of inertia was approx. the same as if front wheel brakes had been fitted. We ran the car with one wheel 2 lbs. out of balance and tyre pressures of 35 lbs/sq.in. We found that we could get bad high speed steering wobbles. We should say that these were as violent as the average wobbles we have been getting with our normal axle under these conditions of tyre pressures and out of balance. We then reversed the Michelin wheels so that the concave portion of the wheel faced outwards. This gave us 5¾" outside centre point steering. In this condition we were unable to obtain a high speed steering wobble. These tests will be confirmed. Hs.{Lord Ernest Hives - Chair} | ||