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).
Drawing of an inlet valve spring (inner) for an engine cylinder head.
| Identifier | ExFiles\Box 126\2\ scan0047 | |
| Date | 27th June 1938 | |
| MODIFICATIONS SHEET DATE SGN 1 2 3 4 Items. Closed. 1:1 Opens. 10% Valve. 10% SK. SECTION OF WIRE: 13 S.W.G. (0.092") No. OF FREE COILS: 6 * INTERNAL DIA: 0.748" * RATE: 29 LBS PER INCH FREE LENGTH: 50.6 m/m FITTED LENGTH: 35 m/m * TO EXERT 18 +/- 1/2 LBS AT 35 m/m TO WORK SAFELY AT 27 m/m fs{F. Steele} = 74500 LBS PER SQ. IN. * SOLID LENGTH NOT TO EXCEED 18.7 m/m fs{F. Steele} = 100,000 LBS PER SQ. IN. HAND OF SPIRAL: LEFT HAND FINISH: NATURAL * IMPORTANT HUMBER HILLMAN COVENTRY 27 JUN 1938 DRAWN: G.W. 2.7.28 TRACED: A.W. 10.7.28 CHECKED: J.A.H. 10.7.28 PASSED: T.S. 10.7.28 SPEC'D: NOTE:- ALL UNLIMITED MACHINING DIMENSIONS TO BE WITHIN +.200 m/m -.200 m/m f MACHINED FINISH H HARDENED G GROUND (Circle with cross) MACHINE ALL OVER m ROUGH MACHINE FINISH HEAT TREATMENT: AS DELIVERED WEIGHT LBS OZ ROUGH FINISH MATERIAL: STEEL SPEC'n: AERO QUALITY FORM: FIN. SECTION LENGTH DIE PATT COMP'NT: ENGINE - CYL HEAD PART: INLET VALVE SPRING (INNER) NUMBER: SK. 21823 | ||