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).
Query from Motor Sport magazine regarding conflicting data on gearbox and final drive ratios, and the brake servo application.
| Identifier | ExFiles\Box 160\5\ scan0104 | |
| Date | 1st January 1941 guessed | |
| if you would kindly clear up one point. "The Autocar" gives the overdrive top as an indirect ratio, and I certainly thought it made just a very slight whine. However, in the gearbox print you forwarded to me, the box-ratios are quoted as 1.0 to 1 for overdrive and 0.7 to 1 for normal top. As the axle casing suggests the 3.64 to 1 final drive, surely the overdrive is direct, as is top gear normally, and ordinary top indirect, the 4.3 ratio on the latter being obtained by the 3.6 axle, plus the .7 reduction in the box = 4.3 to 1? How, then, Litchfield's state- ment and the just audible whine? Could you also confirm, please, that the Girling Brakes have the R-R.{Sir Henry Royce} servo-motor application, as I cannot see the drive for the latter on the blueprint. Thanking you, and with the Compliments of the Season. Yours sincerely, W. Boddy. Act. Ed.{J. L. Edwards} MOTOR SPORT. | ||