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).
Page from a memo discussing carburetter design improvements and their potential application.
| Identifier | WestWitteringFiles\U\2January1930-September1930\ Scan250 | |
| Date | 21th August 1930 guessed | |
| (2) (5) The main jet is arranged to take its inlet diffuser air from a perfectly safe and undisturbed position between the 2 venturii and it enters the main jet at a higher level than the diffuser holes, a special feature which we have developed on the aero engine carburetters. We came across several novelties in designing these carburetters but they seem to be forestalled by other people's patents, such as the vacuum control of the pump, but at the same time we should like this tested out if time permits. It would be interesting to know whether this is preferable to the direct foot pressure. These carburetters are expected to give 15% increase of engine torque over present standard, but we are somewhat doubtful if they will give the economy and smoothness. If successful they can be scaled down for 'Japan', and up for greater HP. on P. 2., but as a first move we believe the sizes we have adopted will be more hopeful for success, and we are anxious not to be too ambitious at first and so risk being able to adopt this type. Our present old pattern has done good service for about 25 years, and it is now hoped that we shall get something better. R.{Sir Henry Royce} | ||