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 wobble and tyre pressure for the Phantom 103-MC.
| Identifier | ExFiles\Box 71\3\ scan0320 | |
| Date | 10th September 1925 | |
| R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. K8950 EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}3/LG10.9.25. To BJ. from Hs.{Lord Ernest Hives - Chair} c. to R.{Sir Henry Royce} c. to PN.{Mr Northey} c. to CWB. OPEN TRIALS 'PHANTOM. 103-MC. With reference to BJ8/DN7.9.25 attached to which is Rl/M3.9.25. Our experience up-to-date is that we have never yet experienced a high speed wobble when using accurately balanced tyres with the standard section, even although the tyre pressure has been 40 lbs. At the moment however there is no complete explanation for the high speed steering wobble, therefore, although we have never experienced it, we think it is possible for a set of conditions to arise when the wobble would build up with balanced wheels and low pressure in the standard tyres. The chief reason for recommending the high pressure was for the fact that even if the wheels were out of balance, high pressure in the tyres will reduce the tendency to wobbles. We consider that on Trials Cars, where there is no excuse whatever for the wheels not being accurately balanced, they could be run with low pressures. Hs.{Lord Ernest Hives - Chair} | ||