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 instructions for modifications to the 'Goshawk I' brake gear arrangement, scheme 724.
| Identifier | WestWitteringFiles\F\January1921\ Scan74 | |
| Date | 27th January 1921 | |
| To BA. from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " WOR.{Arthur Wormald - General Works Manager} " " WFC. [Stamp: ORIGINAL] [Stamp: 27 JAN 1921] [Stamp: RECEIVED] [Circular Stamp: EFCG X.3568] E3/G26/1/21. THE "GOSHAWK I" - ARRANGEMENT OF BRAKE GEAR - N.SCHEME 724 Referring to the above, would you kindly note the following list of points which are being sent in accordance with Mr. Royce's instructions:- (1) Reduce offset of hand brake mechanism by moving the rod .750" nearer to the chassis centre line in section "B". This appears to be as far as it will go. (2) Make differential in plan view .750" nearer chassis centre line to agree with alteration (1) (3) Brake levers on the differential shaft appear to be too narrow which makes them look too long. It is presumed that the angular movement of these levers is now sufficiently large, that is, about the same as 40/50 H.P. chassis which we believe to be 40° approximately. (4) The levers carrying the forward pull rods on the differential shafts should be set back more to anticipate their movement and give a growing leverage. (5) It is assumed that the levers on the adjusting counter-shaft are at the beginning of the adjustment. Both levers should then be set further back so that the lever for the forward pull rod which never alters, should have its proper movement, and the rear pull rod lever should anticipate its movement by half the amount of angular adjustment. (6) The forks used on the cable should be similar to those sent from here for "Goshawk II". (7) The connection for the clutch countershaft from the pedal should be transferred to the top so as to drive directly with less spring, and it should be driven by a crankpin in the plan view from the pedal and lever. (8) The pedal levers should be built up of taper tubes of oval section to eliminate the fault they at present have of being torsionally springy. Mr. Royce remarks that the accelerator pedal has not been shewn. He thinks the general arrangement is now much improved, and would like to see the detail schemes incorporating the above points. We return the blue print herewith. E.{Mr Elliott - Chief Engineer} | ||