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).
Letter from Frank B. Halford discussing an alternative hydraulic rocker design for the 3 1/2 litre Bentley engine.
| Identifier | ExFiles\Box 88\4\ scan0101 | |
| Date | 14th August 1934 | |
| FRANK B. HALFORD, F.R.Ae.S. DESIGNER OF AERO AND AUTOMOBILE ENGINES. Telephone Nos.: Gerrard 1217. Gerrard 1218. 8 & 9 GOLDEN SQUARE, LONDON, W.1. My Ref. ESM/EA Your Ref. HS{Lord Ernest Hives - Chair}/Smth/KW 14th. August 1934. Messrs. Rolls, Royce, Ltd., Derby. SMTH Dear Sirs, Hydraulic Rocker. As mentioned in my letter of the 9th. instant, I have been considering an alternative form of rocker for the 3½ litre Bentley engine with a view to reducing the inertias and loadings of the valve gear as much as possible at the higher speeds you have contemplated. Pending the receipt from you of the further information necessary for the stressing of this alternative rocker, I wondered if you would permit a slight modification affecting the rocker-shaft assembly. It would improve the general form and lightness of the rocker if the height of the fulcrum shaft could be raised slightly - either by packing pieces or by new brackets about 3/16" taller. So far as I can see, there is no intrinsic objection to this, but I shall be glad of your assurance before proceeding further. Yours faithfully, p.p. FRANK B. HALFORD. ESmoult TECHNICAL ASSISTANT, (E.{Mr Elliott - Chief Engineer} S. Moult) | ||