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).
Mr. Royce's remarks and required alterations for the 'Goshawk II' axle, brake, and rear hub.
| Identifier | WestWitteringFiles\F\March1921\ Scan14 | |
| Date | 10th March 1921 | |
| To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} [Struck through text: Copy to E.H. R.W. E.W. DPC.] X.4257 ORIGINAL E2/DS/3/23. 2 RECEIVED 10 MAR 1921 RE "GOSHAWK II" AXLE, BRAKE, AND REAR HUB. Referring to N. scheme 744, would you kindly note Mr. Royce's remarks as follows:- (1) The distance piece between the hub ball bearings should be made lighter and cheaper. It can be either - (a) Solid drawn taper tube. (b) Sheet metal welded into a tube. (c) A pot, drawn parallel or taper with the bottom punched out, leaving an in-looking flange for the outer bearing. (2) The body of the nut which holds the brake drum gear on to the axle tube should be made thinner. (3) Mr. Royce thinks the wire wheel hub and the permanent hub both look too thick. He thinks they should both be reduced in thickness by .025. (4) There seems to be no adequate provision for preventing the wheel coming off should the ball bearings fail. The driving castellations in the inner hub should be formed with a smaller diameter behind the wheel driver as previously used by R.R., so that the driving shaft will hold the wheel in an emergency. (5) The small ring which has been inserted in the hub for the purpose of magnifying the shoulder locating the inner ball bearing should be cancelled. Mr. Royce considers the difference in diameter between the outer races of the ball bearings, namely, 5 m/m, will provide a sufficiently large shoulder. (6) The diameter of the mounting for the brake gear should be reduced by 1.5", that is to say, it is practically what it was on the "Goshawk I" axle. This is the most important alteration, which should have the effect of considerably reducing the weight and cost of the brake gear mounting. The sheetmetal frame work carrying the shoes will also be reduced 1½" in diameter. In effect it means that when the brakes were increased in diameter it was only necessary to lengthen the arms which carry the brake shoes. (7) The smaller drilled holes in the web of the brake mounting should lie close up to the internal diameter of the latter piece, so that they will completely drain the oil from the inner compartment into the outer from whence (Contd.) [Handwritten in left margin: 381 G.C.] | ||