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).
Disagreement over Wraith gear ratio figures and the dispatch of alternative wheels for testing.
| Identifier | ExFiles\Box 108\1\ scan0416 | |
| Date | 24th March 1938 | |
| To Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Chateauroux. 600a Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}8/MH.{M. Huckerby}24.3.38. WRAITH GEAR RATIO. We do not agree with your figures about the increase in gear ratio you have obtained with the 7 1/2 x 17 tyres. We are sending you out a pair of 19" wheels fitted with 6 1/2" tyres which will give exactly the same effect as the Phantom axle gears. Will you please run on them as soon as they arrive. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||