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).
Modifications to a Phantom pedestal piston made from forged magnesium.
| Identifier | WestWitteringFiles\P\July1926-September1926\ Scan110 | |
| Date | 16th September 1926 | |
| TO BY.{R.W. Bailey - Chief Engineer} FROM R.{Sir Henry Royce} ORIGINAL R3/M16.9.26. Copy to BJ. HS.{Lord Ernest Hives - Chair} PHANTOM PEDESTAL PISTON IN FORGED MAGNESIUM. X90260 We send you herewith drawing Lec. 2292. as promised in a previous memo., in which you will see we have modified the piston in many ways. You will notice that we have deleted one ring which gives us a better chance with the piston as well as saving the weight. We think the 3 pinned rings and the one unpinned one will be ample. You will notice also that we have lengthened the skirt .250". Should these pistons come out materially lighter, and in other ways give satisfaction, we should improve the engine in many ways, as the weight of the piston and little ends is a source of some of the defects in the 6 cyl. engine. R.{Sir Henry Royce} | ||