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).
Theorizing that cylinder jacket failures are caused by torsion from differential temperatures in exhaust and induction piping.
| Identifier | WestWitteringFiles\E\July1920\ Scan10 | |
| Date | 29th July 1920 | |
| To ~~BN{W.O. Bentley / Mr Barrington}~~ from R.{Sir Henry Royce} Copy to ~~CJ~~. " " " HS.{Lord Ernest Hives - Chair} X4145 ORIGINAL. RE CYLINDER JACKETS. D 29 JUL R7/G27/7/20. RECEIVED XJ432 It has occurred to me that there is just the possibility of some slight torsion affecting the cylinder jacket, such as might occur if the exhaust pipe became red hot, and the induction pipe very cold with the ingoing gas. This might affect the jacket by putting it in torsion and causing the vertical seam to split. If this were so, one would expect that certain jackets in certain positions on the engine would be more frequently affected than others, and also it might be worth while to test the effect of the rubber joint at the bottom of the jacket compared with the flexibility we have already arranged, which is only flexible for tension and not for torsion. It is quite a remote idea that I thought it worth while to convey it to you that during the experiment you might keep an eye upon that this is not a reason for leakage. You will notice that such a phenomenon would be very susceptible to change in the rigidity of the exhaust manifold, and coupling together all six exhausts instead of three exhausts as we arrange. Is it possible that the Vimy machine has different piping compared with the other aeroplanes upon which it is reported that the engines do not so frequently have jacket troubles ? Hs{Lord Ernest Hives - Chair} R.{Sir Henry Royce} AUG 3 1920 RECEIVED | ||