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).
List of ten considerations and testing parameters for a gearbox.
| Identifier | ExFiles\Box 154a\3\ scan0214 | |
| Date | 27th March 1936 guessed | |
| GEARBOX. (1) Ease of change. (2) Durability. (3) Silence. (4) Chunking in the drive. (5) Suitability of gear ratio. (6) Change speed lever positions and convenience. (7) Oil retaining characteristics. (8) Half shaft strength relative to bottom gear. (9) Floorboard clearance. (10) Effect of out of balance of propellor on gearbox, and general booms. 5,000 miles in London. 10,000 miles in France. Additional 5,000 miles in the Alps and the Devonshire Hills. 5 hours full torque for low gear ratio on the dynamometer. | ||