The J.3. Gearbox for the Vulture, detailing changes in gear ratios and specifications.
| Identifier | ExFiles\Box 123\3\ scan0077 | |
| Date | 14th December 1933 | |
| To BY. {R.W. Bailey - Chief Engineer} from HDY. {William Hardy} c. Wor. {Arthur Wormald - General Works Manager} E. {Mr Elliott - Chief Engineer} Hs. {Lord Ernest Hives - Chair} Da. {Bernard Day - Chassis Design} NNC. X570D. HDY. {William Hardy} 1/HP.14.12.33. J.3. Gearbox in Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine). We are sending herewith N.Sch.3906 which shows higher indirect ratios for the Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine) on the lines of those used on the Bentley. All helical gears are 12 D.P. instead of 14 for J.3. HDY. {William Hardy} | ||
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).