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).
Modifications to the Bentley gearbox for a higher first speed.
| Identifier | ExFiles\Box 86\4\ scan0120 | |
| Date | 2nd July 1935 | |
| P GRY.{Shadwell Grylls} kms To HY.{Tom Haldenby - Plant Engineer} from HDY.{William Hardy} c.c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Bs.{A J. Barnes - Assistant Manager} HLC. HDY.{William Hardy}1/HP.2.7.35. Higher First Speed. - Bentley. N. Sch.4556 herewith shows the modifications necessary to obtain a .425 1st speed in the present Bentley box which is required to protect the transmission from increased stress with the large bore engine. It is necessary to alter the section of the box for a short distance near the central division to allow the reverse shaft pinion to pass through. This opportunity should be taken to increase the amount of metal around the layshaft centre bearing as we show. HDY.{William Hardy} | ||