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).
On gearbox improvements, referencing a Terraplane gearbox design and the potential use of a Peregrine gearbox on a Bentley.
| Identifier | ExFiles\Box 173\2\ img077 | |
| Date | 19th February 1934 guessed | |
| VII 3.00", if the six was brought up to the total displacement it would probably become a rougher unit. The point is we have to live with the six for some time yet and I believe we can learn how to get better results from it by studying this terriplane [STRIKETHROUGH: (6-2597-1) head & receivable)] gearbox. This has had a great deal of money spent on its developement. It was drawn out a long time ago and has had [STRIKETHROUGH: phased] features since. One of the secrets is the use of a special [STRIKETHROUGH: steel] S.A.E. steel 3440 which they say give them some three times the resistance to fatigue of some of the cheaper steels. They have modified the box slightly from the one we have by putting needle bearings on the pilot and a ball thrust there instead of Bakerlite pad. I send a print of a year - but it is worth pulling the box down & examining it. The back lash on the internal gear must be held to 1/2 Thous. If the Terraplane can get away with this we should certainly be able to use the Peregrine box on the Bentley. | ||