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).
Poor acceleration and engine stalling issues with the Falcon X carburetters.
| Identifier | ExFiles\Box 42\3\ Scan025 | |
| Date | 11th November 1926 | |
| X38261 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/ACL1/LG11.11.26. FALCON X. CARBURETTERS. X3933 The outstanding trouble we experience with the RR. Duplex carburetters is poor acceleration when we open up from a speed below that at which the main sprayer is in operation. We have frequently had the engine 'cut out' completely when opening the throttle suddenly from a low idling speed. If however the throttle is opened gradually we obtain a fairly uniform mixture over the whole range with no suggestion of weakness at, or before, the main sprayer comes into action. We can definitely say that the acceleration with this carburetter is considerably worse than on any of our other aero engines and there is considerable risk of 'stalling' the engine if the throttle is suddenly opened. The above conditions are those which exist after applying to the carburetter all the points known to improve acceleration which we have derived from numerous experiments. These experiments are described in this report together with the conclusions we have drawn as to the cause of the trouble and the probable remedy. The Claudel carburetters in the 'V' possess precisely the same characteristic but do not meter so well as the R-R over the idle running range. contd :- | ||