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).
Lower than specified tensile strength and distortion of Ph.III Clutch Pressure Plates G.83381.
| Identifier | ExFiles\Box 93\3\ scan0075 | |
| Date | 11th January 1936 | |
| X31 2 To By C. to E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Smth.8/KW.11.1.36. Ph.III Clutch Pressure Plates G.83381. Confirming our conversation with BY/EM, we have had the tensile strength of one of these plates measured and find it to be about 14 tons/sq.in. We understand that the strength of Millenite, which is the material specified on the drawing, is in the neighbourhood of 25 tons/sq.in. The Order Office inform us that the castings have been made by the Wycliffe Foundry, not Lake & Elliots. It is possible that the lower strength of the material is responsible in some way for the distortion which has been occurring in the plates. Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||