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).
Material composition of tappet springs, including a chemical analysis report for Chrome Vanadium Steel.
| Identifier | ExFiles\Box 66a\2\ scan0010 | |
| Date | 1st January 1926 | |
| 48660 To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to WOR.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}1/LGS.1.26. TAPPET SPRINGS. 43890 We find that the tappet springs which have been running on early experimental engines were made of chrome vanadium wire. The material asked for on the tappet spring drawing is C.V.S. This same material is also quoted on the supersheet. Below is a copy of Hl's report on a tappet spring which we took from one of the original experimental engines :- "This is made in Chrome Vanadium Steel. The analysis is as follows :- Carbon -------- 0.45% Manganese ----- 0.70% Chromium ------ 1.16% Vanadium ------ 0.30% The Vanadium is on the high side, but this is no disadvantage" Hl. Hs.{Lord Ernest Hives - Chair} | ||