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).
Mr. Royce's design criticisms and required modifications for an exhaust pipe nozzle scheme.
| Identifier | ExFiles\Box 45\3\ Scan127 | |
| Date | 4th June 1920 | |
| X4072 To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " By.{R.W. Bailey - Chief Engineer} " " Hs.{Lord Ernest Hives - Chair} " " EFC. X.4072. RE EXHAUST PIPE NOZZLE N. SCHEME 366. Referring to the above scheme, kindly note Mr. Royce's criticisms as follows:- The design shewn in fig. 2 is preferred, and should be proceeded with, with the following modifications:- (1) Make snout about 1" longer, so that the taper portion shewn in the sectional elevation will not offer such a rapid change to the gas flow. (2) The small pieces of metal welded into the mouth should be punched from sheet metal to the shape shewn in the sketch on the blue print, in which two grooves are provided for engaging with the top and bottom walls of the silencer snout. These grooves will prevent the pieces from falling out of position while it is being welded, and will perform an important function of ensuring that the mouth of the silencer nozzle will always be the correct width. (3) The tubular stays should be used, but small embossments should be provided in the sheet metal pressing so that the holes for the tubular stays will be normal. (4) The slots for the locking pieces in the mouth of the nozzle should be sheared out by the people who supply the pressings. This would be an easier operation than punching out the holes shewn in the fig. 1 design. Blue print of N. scheme 366 is attached illustrating the above remarks. E.{Mr Elliott - Chief Engineer} | ||