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 The Packless Gland Co. Ltd. concerning a Bentley Mixture Controls unit.
| Identifier | ExFiles\Box 85\4\ scan0082 | |
| Date | 9th October 1934 | |
| Telephone: SUNBURY 456 (4 LINES) Codes: BENTLEY'S, WESTERN UNION. Telegrams & Cables: PACKLESS, SUNBURY COMMON. THE PACKLESS GLAND CO., LTD. MAKERS OF THERMOFLEX Bellows and Shaft Seals. THERMOFLEX WORKS. Windmill Road, Sunbury, Middlesex. DIRECTORS: M.{Mr Moon / Mr Moore} PAYNE. W. A.{Mr Adams} PAYNE. W. F.{Mr Friese} F.{Mr Friese} MARTIN-HURST. WMH/CH. 9th. October 1934. J.{Mr Johnson W.M.} A.{Mr Adams} Leslie Esq., Messrs. Rolls-Royce Limited. Experimental Department. DERBY Dear Mr. Leslie, I am today sending you one of the Bentley Mixture Controls. In its present condition, movement of the jet commences at 15°C. and ends at 57.5°C., the movement being 0.142". With the Unit I have sent a Dial Test Indicator, which shows you how we have tested the movement, and will also enable you to check it. There is considerable difficulty in getting the temperature right at both ends of the movement. We have fitted a small spring to keep the jet assembly in contact with the top of the bellows plate, and although slight adjustment can be obtained on this spring, it is very inconvenient. It seems to me that there is a lot to be said for Smith's idea of using a large bellows pot with mechanical linkage, since in this case there is plenty of room for spring adjustment and quantities of power to play with. The difficulty of that scheme is, of course, the friction of the gland, but I think that this might be overcome by using a fairly soft bellows as a gland. At any rate the spring value of this bellows would remain constant, and would therefore be a known quantity. | ||