Two types of pistons for a 10,000-mile Phantom engine test.
| Identifier | ExFiles\Box 15\3\ Scan013 | |
| Date | 1st May 1928 | |
| Hs. {Lord Ernest Hives - Chair} from R. {Sir Henry Royce} BY. {R.W. Bailey - Chief Engineer} c. to BJ. Wor. {Arthur Wormald - General Works Manager} E. {Mr Elliott - Chief Engineer} 7040 R3/M1.5.28. PISTONS FOR NEXT 10,000 MILES PHANTOM. Please send two pistons, short and long, sand cast in HL's L.250 (?) and standard, afterwards die-cast. The short one is for current production and EAC.10. production. The long one is for sports, and alum. head All rings to be pinned - bottom wider. Test with perfect circle - hope this will pass. Test with 'L' shaped ring as scraper as shewn because it is practical. Piston pins must be spring tempered. R. {Sir Henry Royce} | ||
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).