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).
Technical drawing of a 'China' valve spring.
| Identifier | ExFiles\Box 106\5\ scan0060 | |
| Date | 28th November 1931 | |
| Hs{Lord Ernest Hives - Chair} 477 VALVE SPRING "CHINA" .975 DIA +.010 INSIDE 1.845 FREE LENGTH 1.100 DIA +.010 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 [STAMP] 28 NOV 31 DERBY. | ||