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).
Potential modifications and material changes for the Goshawk engine induction pipe.
| Identifier | WestWitteringFiles\I\September1922\ Scan14 | |
| Date | 14th September 1925 | |
| R.R. 235A (100 T) (S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 ORIGINAL MISC + (R) TO HS.{Lord Ernest Hives - Chair}) FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer}) Copy to CG. R2/M14.9.25. re. GOSHAWK INDUCTION PIPE.(Broken flange) X5070 X5080 This should have been referred to E.{Mr Elliott - Chief Engineer} at WW. I do not like the idea of screwing it in because it does not seem a manufacturing proposition. (1) The first idea would be to substitute malleable iron instead of cast iron, as I believe we had to do in the exhaust pipe. (2) The second idea would be to try an aluminium induction pipe, as we seem to think preferable on the New PhantomCodename for PHANTOM I. (3) Thirdly, we could deepen the bosses, and even if necessary stand the whole pipe out another ⅛". The nuts can be put on with the induction pipe. In the near future we are considering the use of a water heated throttle, as I believe the carburetter and throttle are insufficiently heated. This would be the original dia. of throttle, and passing through between the cyls. would be an efficient venturi, machined so that the bore was smooth. We should test at the same time whether we could do away with the hot spot, and try such modifications to the induction pipe and valve timing with the hope that we could get increase of power and silent running. Referring to 8-G.111. here. I have the impression that this has an unlucky induction pipe, because at high speed full throttle any attempt at an economical mixture results in firing in the carburetter. I have not proved to my own satisfaction however that it is bad distribution, as it may be due to overheated ignition plugs, or dirty cyls. The testers are probably well aware of the phenomenon. But In our other engines we generally find the power fall off so definitely before the explosions occurrin the carburetter. R.{Sir Henry Royce} | ||