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 a special 40/50 front spring with 17 plates.
| Identifier | ExFiles\Box 87\4\ scan0063 | |
| Date | 6th February 1935 | |
| SPECIFICATION LOAD: 1200 LBS WIDTH OF PLATES: 2 INCHES SPAN: 45" LOADED CAMBER: 1 1/4" Pos FREE ": 11 1/4" DEFLECTION DUE TO LOAD: 10" TOTAL MAXIMUM BUMP: 14" SPECIAL 40/50 FRONT SPRING 17-PLATES SCALE HALF FULL SIZE PLATE N.O. | LENGTHS INS | THICKNESS INS 1 M.P. | 45+EYES | '17 2 | 42 3/4 | '16 3 | 40 1/2 | '16 4 x | 38 1/4 | '15 5 | 35 3/4 | '15 6 | 33 1/2 | '15 7 | 31 1/8 | '15 8 x | 28 3/4 | '15 9 | 26 3/8 | '15 10 | 24'0 | '15 11 | 21 5/8 | '14 12 x | 19 1/4 | '14 13 | 17'0 | '14 14 | 14 9/16 | '14 15 | 12 3/16 | '14 16 | 9 7/8 | '14 17 | 7 1/2 | '14 TOTAL | 2.51 ALL PLATE THICKNESSES SHEWN ARE GROUND FRONT EYE REAR EYE TAPER 1" '17" THICK MAINPLATE THE CENTRE-BOLT HERE IS CENTRAL SPRING SEAT 4" NOTE :- THE FINISHED WEIGHT OF THIS SPRING IS 42 LBS. AS COMPARED WITH PRESENT STANDARD 43 LBS NOTE :- THE RANGE OF STRESS OF THIS SPRING TO THE STATIC POSITION IS 43.6 TONS PER SQ INCH AND TO THE MAXIMUM BUMP POSITION IS 61.1 TONS PER SQ INCH. 2-OFF WERE DESPATCHED ON 9-2-35 REFERENCE ROLLS-ROYCE ORDER. 76760 DATED 21-1-35 DRAWING N.O 124 THOS FIRTH & JOHN BROWN LTD SPRING DEPARTMENT DUNLOP STREET TINSLEY - SHEFFIELD 6TH FEBRUARY - 1935 | ||