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 outer valve spring for an engine.
| Identifier | ExFiles\Box 126\2\ scan0044 | |
| Date | 26th June 1938 | |
| MODIFICATIONS SHEET DATE SGN Handwritten notes: Stress closed 50.5, Open 70.6, cl're 83.2 ENDS TO BE SQUARE WITH AXIS OF SPRING. IMPORTANT: INTERNAL DIA TO BE A FREE FIT ON 22 M/M DIA. Table: SECTION OF WIRE: .128" (10 SWG) NO. OF FREE COILS: 7 1/2 * RATE: 53 LBS PER INCH. * INTERNAL DIA: SEE DRG FREE LENGTH: 64 M/M FITTED LENGTH: 44 M/M * TO EXERT 42 +/- 9 LBS AT 44 M/M TO WORK SAFELY AT 36 M/M f/s = 71,500 LBS. PER SQ. INCH SOLID LENGTH NOT TO EXCEED 31 M/M f/s = 83,200 LBS. PER SQ. INCH * HAND OF SPIRAL: L.H. FINISH: NATURAL * IMPORTANT TO BE FITTED AS PAIRED WITH P.53371 BY MAKERS. Title Block: COMPNT: ENGINE - VALVES PART: VALVE SPRING (OUTER) NUMBER: P53372 Side Box: HUMBER HILLMAN 6CYL. Details Table: DRAWN TRACED: F.C. 21/6/38 CHECKED: [illegible] 22/6/38 PASSED SPEC'D NOTE: ALL UNLIMITED MACHINING DIMENSIONS TO BE WITHIN + .200" M/M - .200" M/M f MACHINED FINISH H HARDENED G GROUND MACHINE ALL OVER m ROUGH MACHINE HEAT TREATMENT WEIGHT LBS OZ ROUGH FINISH MATERIAL: STEEL SPEC'N: AERO QUALITY FORM: FIN. SECTION LENGTH Stamp: HUMBER HILLMAN 26 JUN 1938 COVENTRY | ||