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 discussing a carburetter sketch, its lack of patentable novelty, and its potential application and disadvantages for car and aircraft engines.
| Identifier | ExFiles\Box 39\2\ Scan254 | |
| Date | 11th March 1919 | |
| X.3511 To EH. from R.{Sir Henry Royce} c. to CJ. c. to Sm. R5/G11.3.19. RE CARBURETTERS. With the sketch of the carburetter that you sent us you did not suggest that there were novel features that you thought might be worthy of a patent, and I certainly failed to notice any distinct progress in the design that you had suggested, over so may designs that have been made and tested, and I certainly did not notice the novelty in the feature of the diffuser nozzle being used as an extra air valve. I have sent a copy of this letter to Mr. Southern who will protect the idea in the interests of yourself and the company, if he finds that it is possible. Personally, I doubt if this is the real way of getting a perfect car carburetter, though it may have been quite a useful idea to have tested in conjunction with air-craft engines, and still may be. The disadvantage, however, with any gravity automatic arrangement with aircraft work is that increases the tendency for the mixture to grow strong at higher altitudes, in addition to the natural defect of a simple carburetter in the same direction. Such a device, however, will compensate somewhat for various openings of the throttle and for changes of engine speed with the full throttle. The carburetter required for car work appears to be one that expands from the very smallest dimension up to quite a large area for full power, the car Contd. | ||