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).
Blueprint for an engine cylinder head outer inlet valve spring.
| Identifier | ExFiles\Box 126\2\ scan0046 | |
| Date | 27th June 1930 | |
| MODIFICATIONS SHEET No DATE SGN 1 FREE LENGTH 65 TO 67 M/M MOD Handwritten notes: Fitted Closed 54 Fitted Open 72.6 Free 80mm SK. SECTION OF WIRE: 11 S (0.120") No OF FREE COILS: 6 * INTERNAL DIA: 0.936" * RATE: 42 LBS PER IN. FREE LENGTH: 59 M/M FITTED LENGTH: 38 M/M * TO EXERT 35.5 LBS +2/-1 LBS AT 38 M/M TO WORK SAFELY AT 30 M/M fs{F. Steele}=74,500 LBS PER SQ. INCH * SOLID LENGTH NOT TO EXCEED 24.4 M/M fs{F. Steele}=89,000 LBS PER SQ. INCH HAND OF SPIRAL: RIGHT HAND FINISH: NATURAL * IMPORTANT STAMP: NUMBER MILLMAN 27 JUN 1930 COVENTRY DRAWN: J.S. 2.4.28 TRACED: F.S. 2.5.28 CHECKED: J.D. 2.4.28 PASSED: G.H. 4.4.28 SPEC: f MACHINED FINISH H HARDENED G GROUND m MACHINE ALL OVER ROUGH R ROUGH MACHINE FINISH HEAT TREATMENT: AS DELIVERED MATERIAL: STEEL SPEC AERO QUALITY NOTE:- ALL UNLIMITED MACHINING DIMENSIONS TO BE WITHIN +.200" -.200" COMPNT: ENGINE - CYL HEAD PART: INLET VALVE SPRING (OUTER) NUMBER: SK 21822 | ||