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, testing the effects of adding weighted bands and rings to the wheel assembly.
| Identifier | ExFiles\Box 67\3\ scan0264 | |
| Date | 12th June 1925 | |
| R.R. 498A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. 48480 REF Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG4 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. x457 We have made tests of adding a given weight to the extremity of the axle, with a small moment of inertia rotationally and then a large moment of inertia rotationally. The weight in question was 50 lbs. For the first test the weight took the form of a lead band secured to the circumference of the brake drum. The mean radius of this band was 8.160". For the second test, large brass rings were employed secured to the rim of the wheel. The mean radius of these rings was 11.187". It will thus be observed that the moment of inertia of the 50 lbs. about the hub centre rotationally was almost exactly doubled, in the second case. The moment of inertia of the brass ring is half that of the wheel and tyre. Therefore the total alteration in the rotational energy at any given speed affected by replacing the lead bands by the brass weights is rather less than 20%. We were unable to detect any increase in the violence of the wobbles due to altering the distribution of the masses in the manner indicated. Hs.{Lord Ernest Hives - Chair} | ||