Modifying the Wraith's change speed mechanism to a fully-isolated type to eliminate gear lever rattles.
| Identifier | ExFiles\Box 8\11\ 11-page095 | |
| Date | 11th September 1937 | |
| 628 Hy. {Tom Haldenby - Plant Engineer} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. Da. {Bernard Day - Chassis Design} c. Hdy. {William Hardy} Rm. {William Robotham - Chief Engineer} absent. Rm {William Robotham - Chief Engineer} /Gry {Shadwell Grylls} 1/R.11.9.37. CHANGE SPEED MECHANISM - WRAITH. Judging by the gear leverrattles which we have on both 24 and 27 G.VI, we think it will be necessary to in-corporate the fully-isolated change speed mechanism instead of the semi-isolated speed arrangement; the former, which was fitted on 6.B.IV in conjunction with the raised engine mounting, is free from rattles. Sometime ago we asked you to stiffen up the torsion shaft between the gear lever and the pendulum, and drawings of this have been made. The new drawing of the fully-isolated mechanism should, therefore, incorporate this modification. Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} | ||
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).