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).
Design and material composition of the Claudel Hobson carburetter in comparison to a proprietary water-jacketed design.
| Identifier | ExFiles\Box 121\3\ scan0002 | |
| Date | 14th December 1914 | |
| C O P Y 15/12/14 To Wor.{Arthur Wormald - General Works Manager} for EH from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} COPY. R6/IB141214. December 14th. 1914. Re Claudel Hobson Carburetter. In testing the Claudel Hobson Carburetter you will remember that it is not considered possible, as far as we know, to run the Renault engine on a mixture which is at all weak, as it over-heats more than with a strong mixture. It would also make this engine detonate badly, when hot. The R.A.F. have said that the Claudel Hobson carburetter suits them very well, but you will notice that it has no water jacket whatever, and would, from our point of view, soon freeze up the throttle unless the air that was supplied to it was heated. You will notice that it is made almost entirely of aluminium, this being possible as there is no water jacket, but we have asked you to let us know whether it is usual in the case of the Mercedes engine to water jacket it, and if so, are you sure (by filing) that the water jacketed part of the carburetter is made of aluminium. The carburetter we have designed is thoroughly water jacketed, and we have abstained from using aluminium on any part in contact with the water. We shall, however, let you have a Claudel Hobson carburetter also, to see whether it will do equally well with our more (Handwritten on left margin) H/582 | ||