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).
Experimental modification to the Phantom III gearbox 2nd speed pieces to facilitate engagement.
| Identifier | ExFiles\Box 94\1\ scan0221 | |
| Date | 29th October 1935 | |
| Hdy{William Hardy} X328 BY.{R.W. Bailey - Chief Engineer} C.E. Hs.{Lord Ernest Hives - Chair} Da.{Bernard Day - Chassis Design} RHC.{R. H. Coverley - Production Engineer} HDY.{William Hardy}3/HP.29.10.35. Phantom 3 Gearbox. Experimental Modified 2nd Speed Pieces to facilitate engagement - Cone angle 8°. We send herewith N.Sch.4674 which shows the above. An extra groove is provided in the cone sleeve, which causes the plungers to withdraw the cone just before the teeth come into contact. It is not possible in the present dimensions to hold the cones clear during the whole of the engagement corresponding to the chamfered points of the teeth. If this device is of any use it should permit a smaller cone angle to be used. We accordingly show an angle of 8°. HDY{William Hardy} N.Sch.4674 herewith. | ||