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).
Report discussing engine weakening at high altitude due to potential carburettor freezing in various aero engines.
| Identifier | ExFiles\Box 42\3\ Scan090 | |
| Date | 14th February 1927 guessed | |
| contd :- -3- happening on these other engines but have occasionally had reports from pilots in which they say sufficient weakening could not be obtained on the mixture control at high altitude and which we have since thought might have been due to partial freezing similar to the case we have reported. Claudel's claim that with their spray holes in the choke and the diffuser in the float chamber they avoid freezing but this we should think would depend on the location and method of heating the carburetters. The AVT-70s. have a water jacket just below the throttles and the internal diffuser would obtain heat by this means. If however similar heating were employed as in the case of the F.10. i.e. the top manifolds only jacketed - it would be imagined there would be little difference between central or internal diffusers in regard to freezing. Although there is the possibility of experiencing this trouble in service we should not anticipate failure or stoppage of the engine and see no reason why the F.10. should be more prone to this than any of our other aero engines. We will endeavour to find out the type of carb. and heating employed on the French machine which broke the altitude record. Hs{Lord Ernest Hives - Chair}/A.{Mr Adams} C. Lovesey. | ||