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).
Modifications to the new starting carburetter design for the Phantom Engine.
| Identifier | ExFiles\Box 66\3\ scan0210 | |
| Date | 14th October 1926 | |
| [Stamp: H&Ss{S. Smith} RECEIVED OCT 14 1926] [Handwritten: X8280] E.{Mr Elliott - Chief Engineer} Dept. C. HS.{Lord Ernest Hives - Chair} O.{Mr Oldham} Mr. Hancock. or BY/SS.{S. Smith} BY1/H.{Arthur M. Hanbury - Head Complaints} 14.10.26. [Handwritten: X8280] PHANTOM ENGINE. STARTING CARBURETTER. I am handing you herewith Scheme 821 which was got out in the Drawing Office in accordance with Mr.Hancock's requirements. This has been tried out and has proved to be satisfactory. It is therefore necessary for us to detail and issue for production the new scheme in place of the old. In issuing for production we should make it quite plain that the new scheme is to be brought on at the earliest point at which no scrap will be produced. When I say "no scrap", of course, I am not referring to small quantities of scrap, odd bolts and things of that description, or even a set of parts, odd unions or single pieces which have been made in advance. I am quite prepared to scrap any stuff which we have made which does not represent at least 50% of the complete parts required. There are one or two modifications to Scheme 821 which Mr.Hancock has shown on blueprint which I attach:- 1. Height of the piece can be reduced by a certain amount which has been sketched in ink at the top. 2. The size of the lock nut for locking the nipple controlling the petrol should be reduced so that its dimension across the flats correspond fairly closely with the diameter of the boss upon which it fits. 3. The spring controlling the venturi should be produced with the original number of coils, that is, 7, but the diameter of the wire should be reduced so that the strength of the spring when compressed is reduced to 5/7ths of its original amount and its rating will be similarly reduced. The effect of this will be to open the air space earlier, consequently to increase the amount the venturi moves through, under any given suction. If there are any other points in doubt, please see Mr.Hancock. The scheme in question incorporates the American form of Jet which was secured by a lock nut instead of by a spring controlled locking piece. The Contd. | ||