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).
Modifications to the Wraith gear box for use in the Bentley 111.
| Identifier | ExFiles\Box 99\4\ scan0165 | |
| Date | 15th December 1938 | |
| RY/NS.{Norman Scott} c. Rm.{William Robotham - Chief Engineer} H28 DA.{Bernard Day - Chassis Design}15/G.15.12.38. FJH{Fred J. Hardy - Chief Dev. Engineer} WRAITH GEAR BOX IN BENTLEY 111. Herewith is PD.329 shewing modifications to the overdrive and 2nd speed gears resulting from recent testing of the Wraith Box with conventional ratios.- (1) Reduced helix angle. C.M. 3rd and 2nd Speeds. (2) 3rd and 4th Sliding Piece. (3) 3rd Motion Shaft with increased collar. (4) Thicker rims under the gear teeth. (5) Some modifications shewn on PD.328. DA.{Bernard Day - Chassis Design} | ||