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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 caused by tyres running out of true.

Identifier  ExFiles\Box 29\1\  Scan056
Date  16th September 1925
  
R.R. 493A (50 H) (D.D. 31. 12-8-25) J.H.D.

EXPERIMENTAL REPORT.

Expl. No. 4457

REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG16.9.25.

To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
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. 4485

We have confirmed the fact that if the tyre runs out of truth a wobble will be set up although the wheels are statically in balance. We did this by selecting from a number of 6.75" balloon tyres, two tyres, which when run on the axle only caused the spring seat to rise .015". We could not get a wobble out of this pair of tyres.

We then repeated the test with two tyres which varied .050" - .060" and we were able to produce wobbles.

The measurement of the tyre running out of truth was carried out as indicated in our previous report.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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