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 required alterations to the Goshawk II rear hub and brake drum design.
| Identifier | ExFiles\Box 5\3\ 03-page038 | |
| Date | 1st April 1921 | |
| To Mr. from E.{Mr Elliott - Chief Engineer} Copy to Mr. Y1257 COPY E.H. / Y1257 RE 'GOSHAWK II' - REAR HUB AND BRAKE DRUM. Referring to your scheme N.809, Mr. Royce would like the following points altered and for you to proceed without reference to him:- (1) The oil catcher on the hub is considered by Mr. Royce to be too close. He would like this to be well clear, and of the cylindrical form sketched on the blue print. To make the oil joint positive, this piece should be made in patent steel, riveted to the brake drum. It is thought that the brake drum will not get so hot as to destroy the brazing. Mr. Royce says it is imperative that the oil should not get on to the braking surfaces. (2) The castellations on the hub inner nut should be moved in nearer to the centre of the axle as indicated, so as to throw the oil into the stationary catcher. Mr. Royce thinks this will not interfere with the locking. (3) Referring to the four little lugs which connect the brake shoes. Mr. Royce would like the forms made with a tapped hole instead of the screwed shank. The piece engaging with the cam will then have the screwed shank on it. (4) As an extra safeguard against oiling up the brakes holes should be drilled in the edge of the drum. (5) Referring to the cast aluminium protection cover on the inside of the brake. This should not have a neck looking inwards but should be slightly boomed where its diameter equals the brake centre. Also it should have no rings in its bore. The hub of the brake centre should be made of constant diameter without a collar opposite the cover. This is indicated in pencil on the blue print. (6) The brake drum should be made without the raised facing of increased thickness where it is bolted to the wheel hub. It should be a sheet metal hot pressing welded on the outside only on its flange, and had no inside bore, and around the flange, as indicated by Mr. Royce's note on the blueprint. The two schemes in N.809 and N.810 should now be regarded as finished with by Mr. Royce. Scheme N.809 attached. E.H. | ||