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).
The design and cost estimation for a double reduction gear rear axle for armoured cars.
| Identifier | ExFiles\Box 182\M21\ img071 | |
| Date | 1st August 1921 | |
| To BY.{R.W. Bailey - Chief Engineer} from DA.{Bernard Day - Chassis Design} Copy to RD. DA{Bernard Day - Chassis Design}1/G6/8/21. RE. DOUBLE REDUCTION GEAR REAR AXLE FOR ARMOURED CARS. Please receive N.Scheme 932 general arrangement of centre box shewing bevel drive differential and epicyclic reduction gears which it is intended to make and fit to the existing Indian armoured cars, and to any future armoured cars. Please also receive N.Scheme 933 shewing the improved double brakes for the above axle. It is probable that we shall wish to make some slight changes on both these drawings before they are finally settled, but since it is no good our doing a very great deal of work on them until we are reasonably certain of getting the order, Mr. Royce asked me to send you these three drawings (LeC.939 also attached shewing provisionally a method of mounting the brake levers on the axle tube) in order that you may pass them to Mr. Rodman with a view to preparing an estimate for submission to the Indian Office in the first place. Any changes we are likely to make will not be of sufficient importance to vitiate this estimate. With reference to the estimate itself, Mr. Royce considers that the whole of the designing, pattern making, and tool work which may be required for the brakes shewn on N. Scheme 933 should not be charged to the government in this estimate, as this design of brake will probably be the one used on the new model large cars. It will, of course, be understood that the wheel shewn on N. Scheme 933 is the twin tyre wheel of the N.A.P. Company, and will be provided by them. With reference to the axle as a whole, it is of course necessary to make the estimate as low as possible, and every (Contd.) | ||