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).
Comparing steering effort in lbs for left and right turns on various car models with different tyre pressures and axle weights.
| Identifier | ExFiles\Box 22\1\ Scan237 | |
| Date | 6th April 1925 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG6.4.25. EAC. 'V' series with various tyre pressures. | | 70 lbs. | 50 lbs. | 30 lbs. | |---|---|---|---| | R.H. turn | 200 lbs. | 225 lbs. | 260 lbs. | | L.H. turn | 265 " | 310 " | 370 " | Old type 40/50 car with weight added to front axle weight. | | Total 20 cwts. | Total 23 cwts. | Total 25 cwts. | |---|---|---|---| | R.H. turn | 210 lbs. | 225 lbs. | 235 lbs. | | L.H. turn | 320 " | 330 " | 345 " | It will be seen that the left hand lock takes considerably more effort than right hand lock. This can be definitely appreciated on the steering wheel. The increase in weight on the front axle of 'V' series compared with the EAC.III is 150 lbs. There are now 400 to 500 EAC.III. cars fitted with front axles exactly similar to 'V' series which are running on the road. We have had no complaints of the steering of these cars. We have also made two separate tests of changing the axles over from satisfactory cars to the 'V' series cars and have proved that the axle makes no difference. At the same time we admit that the feel on the steering on the EAC. 'V' series is that it is the axle resistance. contd :- | ||