Higher gear ratio and roller race design for the Spectre rear axle.
| Identifier | ExFiles\Box 92\5\ scan0013 | |
| Date | 6th June 1935 | |
| x302 Gry. {Shadwell Grylls} To EY. from Da. {Bernard Day - Chassis Design} SECRET. Da. {Bernard Day - Chassis Design} 1/HP.6.6.35. C. Wep. E. {Mr Elliott - Chief Engineer} Hs. {Lord Ernest Hives - Chair} Hdy. {William Hardy} WMG. Spectre(Codename for Phantom III) - Rear Axle Gears. It is required to get a rather higher ratio than 4.25 to 1 for Spectre(Codename for Phantom III). Herewith is N.Sch. 4519 shewing an outline of the gears of a 9/35 = 3.89 ratio, for ordering with Gleasons. We suggest that they should be asked to design and make this ratio exactly on the lines of the 8/34 they have already done for us. The stresses and loads are rather lower than in that ratio. There is a question of making the inner roller race solid with the pinion. The stresses appear to be quite low with the separate bearing, and a precisely similar bearing, more highly loaded, has done a great deal of very heavy work on Vulture(Experimental 6 CYL OHV LONG STROKE / Aero Engine), so that there does not seem any absolute necessity to make the roller race solid. However, we have shewn a solid one on N. Sch.4521 also herewith, and suggest that unless it involves us in any difficulties in manufacture the solid one should be used. Da. {Bernard Day - Chassis Design} | ||
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).