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).
Recommending a material change for piston pins from casehardened steel to high duty alloy steel.
| Identifier | ExFiles\Box 15\3\ Scan011 | |
| Date | 15th March 1928 | |
| E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} OY. RG.{Mr Rowledge} from R.{Sir Henry Royce} +7040 R2/M15.3.28. c. to BJ. Wor.{Arthur Wormald - General Works Manager} EP.{G. Eric Platford - Chief Quality Engineer} Fl. AERO ENGINES, 20 HP, & 50 HP. CHASSIS X. 8040 X. 3996 PISTON PINS. X. 7040 X. 685 X. 5040 It should be realised that we already know enough to say definitely that hardened and spring tempered high duty alloy steel is very definitely better than casehardened (CHNS) for piston pins. The material should be changed at once, and in aero engine work the CHNS. pins should be scrapped. Naturally the tests will go on at high speeds and high compression, to doubly confirm the above, and prove if we are now in a safe position for both strength and wear. R.{Sir Henry Royce} | ||