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 wobbles, comparing different car configurations and components.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan238 | |
| Date | 14th September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG14.9.25. C To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c.c. to CJ. BJ. c.c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c.c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c.c. to Wor.{Arthur Wormald - General Works Manager} ORIGINAL HIGH SPEED WOBBLES. X457 X4214 We increased the strength of the springs of the Hispano car to their standard condition. We found that this reduced the tendency to wobble by about 25%. The Hispano car in its standard condition is definitely less susceptible to high speed wobbles than the E.A.C. The main reasons for this appear to be :- (a) Very harsh front springing. (b) Light front wheel brake parts. (c) Front shock absorbers capable of giving a very heavy friction load. (d) Front spring leaves approx. 17% wider than those of EAC. giving resistance to criss cross motion. In addition, possibly friction in the low geared steering promotes some damping and reduces the shocks which reach the driver from the wobbles. We are proving this by testing the effect of the new RR. steering on wobbles on the Edurta Phantom car. We have carried out further tests with varying pivot lean. We find that when we remove the self-centering from a car by leaning the pivots forward we much reduce the tendency of the car to wobble. We can still start a wobble but the latter cannot be sustained and built up to the same extent as when the pivots have a backward lean. There appears to be no contd :- | ||