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).
Two potential schemes for transmission improvement: an oil relay clutch and a vacuum-assisted gear change.
| Identifier | ExFiles\Box 136\2\ scan0109 | |
| Date | 13th June 1939 | |
| -2- RM{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}6/MR.13.6.39. We have just completed a few simple parts designed by Hdy.{William Hardy} to provide clutch operation assistance on O.B.IV. This scheme is an oil relay and will provide information quickly whether the variations in oil pump leakages and the variations due to change of viscosity of the oil adversely affect such a scheme. Secondly, we have been told by Olley that Chevrolet have the best vacuum assisted change speed in the States. We shall try one of these as soon as possible. We shall then be able to decide with which scheme to go ahead for incorporation as an improvement to the existing transmission. RM{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||