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).
Evaluating the steering, brakes, suspension, and rear axle performance of a vehicle.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan313 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Bm/0.331.12.5 being a very good example of the single plate clutch. The thrust race was very noisy. STEERING. Lower geared than the 20 HP. Tyre contact appears to be at least 1.5 to 2" outside centre point. Equally light, not quite so selective. Self centres very well. Good for absence of road shocks on the wheels Steering column requires more support, as it vibrates badly. No high or low speed wobbles. (One would not expect the former at the speeds attained and tyres pressures employed. BRAKES. These brakes are remarkably smooth in action, and the pedal is very free from spring. A large amount of pedal pressure is required to lock the rear wheels, however, and there is very little front braking (say 20%). The steering is quite unaffected by sudden brake application; with the small amount of front braking present, however, this is not surprising. SUSPENSION. The semi-balloon tyres employed were run at inflation pressures of 40 - 45 lbs.sq.in. so that little benefit could be expected from them. The suspension was not very good, particularly the front which seemed over-sprung. The shock absorbers appeared to be rather too much set up. REAR AXLE. This was quite unobtrusive. contd :- | ||