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).
The causes of high-speed wheel wobble, concluding that wheel balancing is the most effective cure.
| Identifier | ExFiles\Box 29\1\ Scan030 | |
| Date | 9th September 1925 | |
| W/N. c. to EY. c. to HS.{Lord Ernest Hives - Chair} c. to BP. K457 Hm{Capt. W. Hallam - Head Repairs}'s Department.(Hm.{Capt. W. Hallam - Head Repairs}is absent). NRC{N. R. Chandler}3/EW9.9.25. Chassis 123-EM, 16-LM, 103-MC, & 15-MC. In reply to your Br7/H.1.9.25, we do not agree that slack in the pivot bushes would cause high speed wobble or that removal of slack would cure wobbles. This opinion is shared by Ey. Hs.{Lord Ernest Hives - Chair} and Mx.{John H Maddocks - Chief Proving Officer} In the case of the P.N. Trials Car 103-MC, which you had at N. in July and again in August to cure H.S. wobbles, the new pivot pins and bushes did not cure the wobble, and when the car subsequently came to W. it was found that the wheels were out of balance, and that balancing them was effective in curing the wobble. We would add that some of the pins and bushes returned from the above cars, do not show any appreciable signs of wear and we doubt if standard pins and bushes would have appreciably less slack. At this rate pins and bushes would require renewing every few thousand miles. We believe the only cure for high speed wobbles consists of: Balancing the wheels. Inflating tyre to 50 lbs. Adequate damping on front Shock Absorbers. NRC.{N. R. Chandler} WPE | ||