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).
Steering wobble tests for chassis 9-G-111.
| Identifier | ExFiles\Box 4\9\ 09-page135 | |
| Date | 30th August 1925 | |
| R.R. 2974 (500 Pds) (B) (P) 7750 27-6-25 1.A.H. EXPERIMENTAL REPORT Expl. No. REF. GWH{George W. Hancock - Head Chateauroux}1/Cm.30. 8.25. Hotel de France, Chateauroux, Indre, France. To He. From G.W.Hancock ----------------- CHASSIS 9-G-111. Tests for steering wobbles, carried out as per your instructions. Conditions of tests. Cross steering tube, and side steering tube ball and joints all O.K. New Dunlop tyres on front. Wheels perfectly balanced. With these conditions, the steering is very good. Driven at max. speed of 60 m.p.h. over rough and smooth roads, no inclination of wobbles could be detected, and shocks on steering wheel were very slight. Steering at low speeds is heavier than with standard 'Goshawk', but is considered to be quite O.K. N.S. wheel 1 lb. out of balance. No definite distinction could be felt under this condition. N.S. and O.S. wheels 1 lb. out of balance. No inclination to wobble at low speeds. At speeds from 52 to 55 m.p.h., wobbles are continually coming and going, but there is no amplitude of these wobbles. A general tugging and shocks to steering wheel are more definite. N.S. and O.S. wheels 2 lbs. out of balance. No wobbles could be built up at low speeds. Steering is much worse all round. Shocks start at 30 m.p.h. and one feels as if wobbles want to develop up. At 52 m.p.h., the car gets into a definite wobble. The amplitude increases at 55 m.p.h., and the wobble is still there at the max. speed obtained, viz. 60 m.p.h. The car can be held fairly safely under these conditions, but one feels that it only requires a pot-hole, or some unforeseen condition, when it would be impossible to hold the car. These wobbles are definitely not the dancing wobbles that you have stated to be the case with high speed wobbles. On the other hand, the majority contd:- | ||