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).
Failure of a 25HP exhaust manifold and potential design improvements.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan194 | |
| Date | 10th January 1931 | |
| PY. FROM E.{Mr Elliott - Chief Engineer} S. to RR. WOR.{Arthur Wormald - General Works Manager} [Struck through] C. to RR. Chr. [Struck through] ORIGINAL [Stamped] 25HP. EXHAUST MANIFOLD. We have a sample of the above handed to us by GWH.{George W. Hancock - Head Chateauroux}, which has broken at the usual place after 9000 miles in France. The break has started on the inside of the bend near the rear end, and the section shews that the wall is thin at the point where the fracture started, but not perhaps more than the variation one would naturally expect with a casting of this type. This pipe has run further than those which have hitherto failed and represents an improved result. There are one or two moves which suggest themselves to over-come this trouble: (1) Further increase in thickness of walls in the locality where breakage occurs. (2) Change of material - (a) Could not this pipe be made in malleable? (b) Would the use of nickel cast iron improve the strength when hot? Could you deal with point (1) or would you like us to send you a sketch. We should like to know your views as regards point (2) E.{Mr Elliott - Chief Engineer} [STAMP] RECEIVED 12 JAN 1931 H | ||