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).
Overweight sample Eagle 16 piston and proposed methods for weight reduction.
| Identifier | ExFiles\Box 41\1\ Scan042 | |
| Date | 27th August 1923 guessed | |
| X.3802 To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. to CJ. BY.{R.W. Bailey - Chief Engineer} E4/M21.1125. EAGLE 16. PISTON X.3802 With regard to the sample Eagle 16. piston you left with us, we have cut this up because it appeared to be rather heavier than we expected, and we find that the crown is .062 in excess of the thickness we ask for all over, and also the upper portion of the inner cylindrical part of the piston, together with the piston pin bosses. The casting is a very nice clean one, but we should like to get down a little of its weight, as the Zephyr piston should not need such a thick crown as the trunk piston. No doubt when machining thesein quantities they will be located mainly from within the crown so that the latter is held to the desired thickness. We return to you under separate cover one section of the piston roughly marked in pencil shewing where we want to get the weight down. It is not very much that we can remove, but the weight has to be constantly watched and pared down, especially on moving parts. E.{Mr Elliott - Chief Engineer} | ||