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).
Modifications to the side steering tube for the Ph.III Marles Steering on 25/30 HP models.
| Identifier | ExFiles\Box 153\2\ scan0001 | |
| Date | 2nd January 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Hy.{Tom Haldenby - Plant Engineer} c. to Da.{Bernard Day - Chassis Design} X1300 Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}7/KW.2.1.36. Side Steering Tube for Ph.III Marles Steering on 25/30 HP. When we use a Marles type steering on the 25 HP. chassis we find that owing to the lower gear ratio used with this steering it is necessary to considerably increase the set up load and reduce the movement of the side steering tube springs in order to obtain reasonable directional control at high speeds. The spring loads and movements that we have been using are shown on the attached sketch, and as can be seen they are to all intents and purposes the same as on Bentley. This modification was first made by Hs{Lord Ernest Hives - Chair}/GWR. when he had the Marles L.7. type gear on 21-G-IV in France, and has been used subsequently on all experimental 25 HP. Marles steerings. The parts used are shown on the attached Ex.16585/6/7/8/9. We think that if the R.R. Marles steering is to be standardised, the modified side steering tube springs and set up loads should be standardised also. If you agree to this will you please let us know so that we can instruct it for the next 10,000 mile 25 HP. test car. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||