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 page discussing carburettor freezing tendencies in aircraft engines and potential solutions, with an extract from a Curtiss engine test.
| Identifier | ExFiles\Box 42\3\ Scan089 | |
| Date | 14th February 1927 guessed | |
| cpntd :- -2- evidence supports the above assumption. The air intake used on these particular carbs. was not fitted with the stack pipe having the hot water pipe passing through it. We think that the small amount of heat given to the air by this latest system should be an advantage in reducing the freezing tendency. When the engine is installed in a machine and encased in the cowling we should expect the carburetters to keep much warmer and so have less tendency to freezing troubles than on the hangar test where they were subjected to the cold air stream drawn through by the air screw. The following is an extract from an Aircraft Est. Report on the Type Test of the Curtiss engine :- "Excepting a greater tendency for the carbs. to freeze up, owing to the weather being very damp, the run was satisfactory. As an attempt to minimise the freezing, two sheet cowls were made up, one fitting the front of the engine and filling up the gap between the two cyl. blocks, and the other being fitted along the top of the engine above the carbs. A new air intake, which protruded through the top cowl was fitted, as the previous one had been stayed to suit the test bed requirements. Test with propeller completed satisfactorily". The Condor, Eagle and Falcon carburetters have similar diffusers to those employed in our F.10. carbs. and one would imagine would be just as liable to similar trouble. We have had no direct evidence of this contd :- | ||