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).
With diagrams comparing different piston designs and materials, based on notes from America.
| Identifier | ExFiles\Box 148\3\ scan0084 | |
| Date | 27th November 1934 | |
| X2748 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Wsr. c. to By.{R.W. Bailey - Chief Engineer} c. to Hs{Lord Ernest Hives - Chair}/Wd.{Mr Wood/Mr Whitehead} We give below copy of some notes on Pistons, received from Mr. Olley in America :- "Notes on Pistons, just gathered from Byron Ellis. "At present we are using pistons with 'T' slots, thus :- These are in Lynite, possibly similar to 'Y' alloy. The difference in practice between this and Low-Ex, is not marked. They are all "anodyzed" but the actual effect of Anodyzing on wear is doubtful. Probably it helps during the break-in period. "Trans-Slot" pistons thus :- with inside pillars thus :- are proving more successful than the 'T' slots and have as little hot friction as the latest Nelson Invar Strut Type (about one-third of 'T' slot friction). We have them in both Low-Ex and Lynite without definite preferences either way. | ||