Comparing the steering systems of the Phantom III and 25/30 HP models, detailing differences in cam lead, cam bearings, and wheel bearings.
| Identifier | ExFiles\Box 95\1\ scan0299 | |
| Date | 13th May 1936 | |
| X350 To E. {Mr Elliott - Chief Engineer} c. to By. {R.W. Bailey - Chief Engineer} c. to Da. {Bernard Day - Chassis Design} c. to Ev. {Ivan Evernden - coachwork} Hs {Lord Ernest Hives - Chair} /FJH. {Fred J. Hardy - Chief Dev. Engineer} 3/KW.13.5.36. Ph.III and 25/30 HP. Steerings. Re E.5/HP.5.5.36. The reasons for the differences between the Ph.III and 25/30 HP. steerings are as follows. Cam Lead. Ph.III - 0.800"; 25/30 HP. - 0.700". The 0.700" lead is used on 25/30 HP. in conjunction with a long pendulum lever as it gives slightly better results as regards joggles. This lead cannot be used on Ph.III because we do not want a lower geared steering at present and the pendulum lever length cannot be increased owing to insufficient ground clearance. Cam Bearings. Ph.III - Adamant; 25/30 HP. - Timken. The 25/30 HP. specification was drawn up after that of Ph.III and is more up-to-date. Timken bearings will be standardised on Ph.III when they have been 10,000 miles tested. Wheel Bearings. Ph.III - Adamant; 25/30 HP. - Ball. The 25/30 HP. is also more up-to-date in this feature. This completes the list of differences between the two cars. We require a scheme for the use of ball bearings on the Ph.III wheel to suit 0.800" lead before we can test this feature. Hs {Lord Ernest Hives - Chair} /F.J.Hardy. | ||
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).