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).
Requesting the detailing of three sets of new timing gears for the Wraith with an increased helix angle.
| Identifier | ExFiles\Box 136\1\ scan0217 | |
| Date | 22th June 1937 | |
| HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} 1155 Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}3/R.22.6.37. WRAITH TIMING GEARS. We wish to try some gears on the Wraith with increased helix angle to assist in the production of quiet gears. The following are particulars of the gears we wish to try:- (1) 10 D.P. (2) 40° 51½' helix, hand as at present. (3) Crank pinion. 27 teeth, all other dimensions as at present. (4) Camwheel. 54 teeth. (5) Dynamo pinion. 18 teeth. Will you please detail these gears and make three sets. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||