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 specification for use with Wraith wheel movement on a Phantom III vehicle.
| Identifier | ExFiles\Box 95\1\ scan0382 | |
| Date | 10th February 1937 | |
| SECRET. E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer} c to By.{R.W. Bailey - Chief Engineer} c to Da.{Bernard Day - Chassis Design} c to Ev.{Ivan Evernden - coachwork} Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}1/M.10.2.37. Steering Specification for use with Wraith Wheel Movement on P.III. The Wraith Wheel Movement Suspension Levers on P.III necessitate a lower ratio steering gear in order to keep the turns from lock to lock at the same figure as at present. This results in greater loads on the gear, so we have fitted to 35-Ex a roller follower as on the attached print. Rig tests indicate that this roller has, approximately, 100% greater load capacity than the standard P.III roller follower. We give below a specification of 35-EX steering gear:- (1) 0.700 lead Cam to Adamant No. 22344 (2) Timken bearings on Cam. (3) Roller follower made by Ransom and Marles, with 12 - 5/16 dia. balls in each row, as on attached print. (4) Rockershaft to suit 0.700 lead cam and lightened to attached Rm{William Robotham - Chief Engineer} 185. The gap between the rockershaft jaws should be 1.348 + 5 after spotfacing, and the difference between this and the assembled width of the roller made up by 0.002 and 0.003 pensteel shims. (5) Rockershaft pin without splines to attached Ex 23594/A, case hardened. (6) The rating of the side steering tube springs is doubled and the travel reduced to 0.120. This has been done experimentally by shortening the standard spring and fitting distance pieces. The springs have no set up load. If you approve of the above modifications will you please let By know. Should the above parts be standardised, steps should be taken to avoid a manufacturing | ||