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 observed on vehicle 7-EX with medium pressure tyres.
| Identifier | WestWitteringFiles\O\April1926-June1926\ Scan5 | |
| Date | 2nd April 1926 | |
| ORIGINAL TO HS.{Lord Ernest Hives - Chair} & DA.{Bernard Day - Chassis Design} FROM R.{Sir Henry Royce} (Le CanadelHenry Royce's French residence.) Copy to - CJ. BJ. R2/M2.4.26. Delivered to WW. during the Easter holiday. re. HIGH SPEED STEERING WOBBLES. X457 X235 7-EX. MEDIUM PRESSURE TYRES. X4565 X8820 On 7-EX. we find we get these at the following speeds - @ 30 lbs. per sq. in. 65. MPH. @ 35 " " " 70, MPH. myself driving to find them on three occasions. Probably they have come on because the front pivots are well oiled and worn very free, and the shock dampers have probably worn much freer after about 7,000 miles. In a few days we shall be fitting our hydraulic ones, and can confirm. The effect is not very distressing: one feels the vibration and reduces speed. I should like a table made of different pressures, speeds, and styles of tyres, for the Phantom and India, and add the new lighter Phantom axle as soon as you receive it. R.{Sir Henry Royce} | ||