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).
Requested alterations for the 'Goshawk' footbrake adjustment.
| Identifier | WestWitteringFiles\F\February1921\ Scan27 | |
| Date | 10th February 1921 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to [illegible strikethrough] EFC. X 4258 RE "GOSHAWK" - FOOTBRAKE ADJUSTMENT. N. 734. [Handwritten Note Top Right]: Sketch attached to DA{Bernard Day - Chassis Design}'s copy only. 3 E1/09/2/21 [Stamp]: ORIGINAL [Stamp]: 10 FEB 1921 [Stamp]: E F C [Stamp]: RECEIVED Would you kindly note the following points which Mr. Royce would like altering in connection with N. [text obscured by RECEIVED stamp].- (1) Make the castellations for the inner lever smaller than the castellations for the central lever. The tubular shaft will then have constant section through the central portion which carries the bending moment due to the first pull, and furthermore, the mechanism can be assembled by threading the shaft through the side channel. This method of assembling is much easier and not liable to get balked by any additions to the inside of the chassis. (2) Rivet on a bracket to the central channel for carrying the inner end of the shaft to avoid making a complicated shape for the central channel. (3) Lower the centre of the shaft as much as possible below the top of the frame. The decreased diameter of the tail end bearing will allow a small movement here. (4) Mr. Royce does not like the exterior oil hole, which he thinks will collect dirt. He would like the central lever fitted with an oiler drilled at an angle through the boss in the root of the lever, and feeding oil to the interior of the shaft through a slot in the shaft. (5) The brake adjustment should be extended sideways so as to project through the valance. Mr. Royce thinks that to accomplish this the spring should be moved one inch outwards, and the handle lengthened the remaining required distance. The first move would have the effect of bringing the loaded shaft right inside the bearing and avoiding the overhang which exists at present on the outside tube. (6) The outer tube mentioned in the previous item, which we will call the locking tube, Mr. Royce would prefer to make in a more simple manner. The shell of this piece should be made from tubing, and the partially blind end should be formed by brazing or sweating in a plug. This plug would have the locking notches on it, which should be of the 90° order, and much wider radially than shewn. Mr. Royce would prefer the inner end to be locked to the serrations on the shaft by two radial rivetted-in pins with heads. (7) The adjusting handle should now have notches of increased radial width to suit the locking tube already described, and to avoid the re-entrant annulus it should be cupped outwards. (8) Mr. Royce would like the spring made with a very much lower rating. He thinks the initial load is quite suitable, but that the wire is too thick. We attach a sketch illustrating the above points. E.{Mr Elliott - Chief Engineer} | ||