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).
Proposing a modification to the gearbox to fit a correctly reading speedometer on the Goshawk I chassis.
| Identifier | ExFiles\Box 45\3\ Scan228 | |
| Date | 8th February 1921 | |
| To HS{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design} Copy to BY.{R.W. Bailey - Chief Engineer} X4077 DA{Bernard Day - Chassis Design}16/CB2-2-21. Hs{Lord Ernest Hives - Chair} FEB 8 1921 SPEEDOMETER ON GOSHAWK I. X4077. It is desired to fit a correctly reading speedometer on this chassis, but at present it has been found difficult to do so on account of the gears in the gear box, and the fact that Elliott's speedometer requires to run at 720 revs to the mile. We propose that the gears in the gear box should be modified to 17-37 instead of the present 18-36, and that the standard 1 1/2 to 1 gear box belonging to Messrs Elliott, of which we attach a specimen, should be secured in some convenient position, either on the frame, or on one of the cross members close to the gear box, and that another flexible shaft should be run from this gear box up to the instrument board. With this arrangement we shall get 715 revs to the mile instead of 720, an arrangement which reads less than 1% low, and which we think is within the variation of the tyres. If you are agreeable to this course we should be glad to know if Mr Bailey can make details of the two new gear wheels, and if the rest of the apparatus can be fixed up in the Experimental Shop without further reference to ourselves. DA.{Bernard Day - Chassis Design} RECEIVED | ||