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).
Design specifications for a valve spring named 'China'.
| Identifier | Morton\M13.2\ img139 | |
| Date | 28th November 1931 | |
| HS{Lord Ernest Hives - Chair} 477 VALVE SPRING "CHINA" ROLLS-ROYCE PRINT ROOM 28 NOV 31 DERBY. .975 DIA +10 INSIDE 1.845 FREE LENGTH 1.100 DIA +10 OUTSIDE R= 115 lbs/IN S= 85000 /IN DIA OF WIRE .160 5 WORKING COILS AND 3/4 OF A COIL GROUND SQUARE EACH END MAKING A TOTAL OF 6 1/2 COILS LOAD AT 1.450 = 46 lbs STRESS 34000 " " 1.100 = 86 " " 64000 | ||