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).
Gearbox design improvements, comparing Vulture and Phantom III synchromesh cones.
| Identifier | ExFiles\Box 94\1\ scan0294 | |
| Date | 8th January 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}15/KW.8.1.36. Another feature noticeable, was the ease with which the train of gears were revolved which have to be speeded up to engage the third gear, in comparison with those in the box of the Ph.III we had been investigating. This tends considerably to an easier change, as there is less load for the synchromesh cone to do. The bronze cones of the Vulture are .500" wide as against .625" Phantom. This design gives less overhang and stiffens up the cones, a fact which has proved in there being no distortion. The rim of the steel cone is slightly larger in section which gives it more strength. We are going to reproduce this design of the cones, both bronze and steel, for the Phantom box, but we are altering the angle from 10° to 7°. This is to reduce the time factor for the synchronising of the gears, as there should be less slip. With the .500" width there should be no trouble with sticking. We have instructed these cones and should be in a position to test them within the next few days. Hs{Lord Ernest Hives - Chair}/G.W. Hancock. | ||