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).
Engine mounting options, considering different feet designs, fabrication methods, and vibration issues.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan197 | |
| Date | 26th February 1929 | |
| SECRET ORIGINAL FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence.) R1/M26.2.29. REC'D AT WW. 2.3.29. C. to SG.{Arthur F. Sidgreaves - MD} WCR. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} G.4. ENGINE MOUNTING. X5005 I like the position of the feet sketched on E's memo. of 16.2.29., but I fear the tubes pushed into the aluminium casting, though they have been successful in earlier Goshawks, may not now be when we use 4 feet, often one pulling against the other perhaps rather severely. I am inclined to think we ought to use the same type as Phantom which, if I remember rightly, is a box foot with a hole cored in the end and faced, 4 bolts or studs holding the square flange bored for the tube to slide in. I think in this case we might use studs: they would be easier and less expensive. For simplicity we ought to be able to make the tube and angle in one piece by brazing, or welding, or screwing - (screwing and welding appears to me most economical.) Perhaps you can suggest some other foot. I believe we could get the combination we want easier and more effectively if we had 2 more feet or damper scheme between the back of the gearbox and the cross member. Our 18-EX. is not bad with the front feet rigid and the rear ones flexible, and it would be still better with these rear ones less flexible. It would seem as if Mr. Elliott cannot spare the time to come here this year because we must finish the few pieces which are wanted for the SS.{S. Smith} We think here that some of the engine vibration comes from the exhaust system, and it is possible that we must cure this before we criticise or condemn finally the engine mounting. Speaking generally I imagine that the front feet should be more rigid than the rear. This could be confirmed by reversing the degree of flexibility. R.{Sir Henry Royce} | ||