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).
Responding to an Air Board query about R.R.C.H. carburettors, disputing the results of R.A.F. tests.
| Identifier | ExFiles\Box 37\2\ scan 196 | |
| Date | 8th March 1918 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X3188 To R.{Sir Henry Royce} from EH. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} X 2959. [crossed out] X.3010. [crossed out] EH1/LGS.3.18. 8th March. 1918. R.R.C.H. CARBURETTERS. The Air Board have asked for a reply to their note 275/4552/9.3.18 on R.R.C.H. Carburetters. Below are our views. As Mr. Royce sent the original memo, we assume that he will send the reply asked for. We cannot accept the R.A.F. tests on the R.R.C.H. carburetter as being correct, because the results do not agree with tests we have carried on the engine. We are prepared to prove that the range of control on the R.R.C.H. carburetters, working on an "Eagle" engine is much greater than the R.A.F. test show. No automatic effect at altitude can enter into it, because we obtain the range on the ground. The petrol air ratio curve does not agree with the results obtained on the engine. We claim that the R.R.C.H. is economical at cruising speeds with the throttle partially closed. The R.A.F. tests show xxxx the mixture to be strong at that point. The criticism we had of the first R.R.C.H1 carburetters in the air, was that the mixture was weak as the throttle was partially closed, this we consider is a desirable feature. Attached herewith is a report from Martlesham Heath on R.R.C.H. Carburetters which confirms this. The consumption tests taken last summer on an "Eagle" engine fitted with a R.R.C.H. carburetter in a D.H.4 were, in our opinion exceptionally good. (CONT'D) | ||