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).
Tyre clearance with the cross steering tubes on Wraith, Phantom III, and Bentley models.
| Identifier | ExFiles\Box 108\3\ scan0139 | |
| Date | 2nd November 1938 | |
| To. Rm.{William Robotham - Chief Engineer} c.c. Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} (struck through) (Handwritten): QRT 600a CHATEAUROUX. 2/.II.3.38. 26.G.VI.- 25/30 HP. Tyres Touching Cross Steering Tubes. Replying to your memo Rm{William Robotham - Chief Engineer}/Les.9/AP.7.3.38, the tyres do not foul the cross steering tube ends under any normal conditions. The static clearance is 9/16". We have observed tyres marked in the way you mention on Wraith, Phantom III, and Bentley, but only under abnromal conditions, and it does not appear to do any harm. We do not think there is any need to increase the clearance on Wraith with the present 6.50" section tyres. When you go to 7.00" tyres, as we think you eventually will, it may require attention. ---------- Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} I. W. Waller. | ||