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 1st speed gears for the Vulture gearbox.
| Identifier | ExFiles\Box 123\3\ scan0148 | |
| Date | 7th March 1934 | |
| x4704 To BY.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} c. Wks. B. Hs.{Lord Ernest Hives - Chair} Hq. RMO. HDY.{William Hardy}1/HP.7.3.34. GRY{Shadwell Grylls} J.3. Gearbox in Vulture. Will you kindly instruct 1st speed gears for the Vulture .075 wider than now as shown by N. sch.4007 herewith. It will be seen that the existing 1.0" travel of the 1st speed pinion is sufficient to make full use of the extra gear width. The material of the gears is to be S/ZNCR, as you suggest, and the hardness of surface is equally as important as the core strength. The gears are to have the correction for strength that is already in use, i.e. 20/1000" thicker pinion teeth than standard. Advantage cannot be taken at this stage of the extra width to improve the reverse gears owing to the small clearance between the reverse pinion and the 3rd speed pinion and for this reason, this scheme is only a temporary means for determining whether the 1st speed gears will stand up to the dynamometer test. HDY.{William Hardy} | ||