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).
Proposal to modify the Wraith gearbox for the Bentley by reducing the 3rd speed gear ratio from .8 to .774.
| Identifier | ExFiles\Box 86\4\ scan0105 | |
| Date | 19th October 1934 | |
| To BY.{R.W. Bailey - Chief Engineer} Copy to Wor.{Arthur Wormald - General Works Manager} B. Hs.{Lord Ernest Hives - Chair} DA.{Bernard Day - Chassis Design} RHC{R. H. Coverley - Production Engineer} MX{John H Maddocks - Chief Proving Officer} x4709 228 22 HDY.{William Hardy}1/MN.19/10/34. Wraith Gearbox for the Bentley. N Sch. 4212 herewith shows the gears we propose for this box on the Bentley. The ratios are the same as now except for the 3rd. speed which is .774 instead of .8, a reduction of 3%. We suggest this reduction as the result of recent investigations which indicate that the 3rd. speed is at present too high. At .774 it will still be higher than would appear best for maximum performance but a compromise appears to be indicated in this case. The 1st speed and reverse gears and the helical splines are the same as for the Wraith. HDY.{William Hardy} Encl. N Sch.4212. | ||