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, detailing calculations of amplitude and time from chronograph records.
| Identifier | ExFiles\Box 28\4\ Scan339 | |
| Date | 25th August 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4457 REF Hs{Lord Ernest Hives - Chair}/Am/1024.8.25. 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. 44630 We find by calculation from our Chronograph record that the amplitude of a fairly bad high speed wobble occurring on a car fitted with balloon tyres is approximately 17°. The periodic time of one wobble was .117 secs. The time taken to swing through 4° each side of the centre in one direction was .018 secs. Assuming the moment to be S.H.M. this gives a total amplitude of 17°. We have confirmed the fact that adding weight to the brake drums increases the amplitude of the wobbles and increases the tendency for these wobbles to be set up. The latter tests were carried out with balloon tyres on a Silver Ghost model - the previous tests on a Phantom. Hs.{Lord Ernest Hives - Chair} | ||