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).
Comparing stresses and loads on various Bentley axle gear ratios.
| Identifier | ExFiles\Box 84\4\ scan0008 | |
| Date | 19th June 1933 | |
| X202 To EY. from Da.{Bernard Day - Chassis Design} Da.{Bernard Day - Chassis Design}1/HP.19.6.33. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Bentley Axle Ratio. Referring to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KT.17.6.33, according to our method of working it out the stress in the 11/43 gear is slightly higher than that in the 10/41 gear. The increase is about 5%. We consider that it is not worth troubling about and that there is no objection to the adoption of the 11/43 gear. Below is a table of the stresses and loads as we estimate them:- | | Bensport 10/41 ratio. | Bensport 11/43 ratio. | Peregrine 9/46 ratio. | | :--- | :--- | :--- | :--- | | Stress. 1st speed. lbs/in2 | 125,500 | 131,700 | 133,750. | | Stress. top gear. lbs/in2 | 45,600 | 47,800 | 40,500. | | Load/inch of face of gear 1st speed. lbs/in | 6300 | 6060 | 5365. | | Load/inch of face of gear, Top gear, lbs/ins | 2288 | 2203 | 1627. | [STAMP: RECEIVED JUN 19 1933] Da.{Bernard Day - Chassis Design} | ||