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).
The issue of spitting in the silencer for the 30 HPD.C.42.
| Identifier | ExFiles\Box 101\3\ scan0083 | |
| Date | 14th June 1937 | |
| To Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} 500? Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}11/JH.14.6.37. REPORT ON SPITTING IN SILENCER 30 H.P.D.C.42. The main cause of this complaint is due to the economical design. This allows a reverse air bleed to operate for part and full throttle openings. It is also responsible for the "luffing" trouble. The conversion scheme Rm.{William Robotham - Chief Engineer}392 practically cures both complaints. It is incorporated in the carburettor itself. With regard to consumption, two carburettors each of standard and converted types were tested and the average loss on the latter was .5 to .75 M.P.G. at 45 M.P.H. Both converted carburettors are now available for bench tests metering throughout the range. Rm{William Robotham - Chief Engineer}/G.Ratcliffe. | ||