The measured deflections on the Wraith gearbox transmission shaft when tightening a nut.
| Identifier | ExFiles\Box 8\11\ 11-page115 | |
| Date | 11th February 1938 | |
| To Da. {Bernard Day - Chassis Design} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. By. {R.W. Bailey - Chief Engineer} c. Da {Bernard Day - Chassis Design} /Hdy. {William Hardy} 628 Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 3/AP.11.2.38 WRAITH GEARBOX. As requested by Da. {Bernard Day - Chassis Design} , we have measured the deflections that take place when tightening the nut at the rear end of the Wraith transmission shaft with a spanner torque of 200 lbs/ft. The increase in the diameters A. {Mr Adams} and B. measured in the plane XX. was .005. The coupling itself moved .070 up the taper and to allow this the ball bearing had to be removed and washers used under the nut when the small end of the shaft taper appeared through the coupling. 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).