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 special low-rating front and rear road springs for a Bentley chassis.
| Identifier | ExFiles\Box 87\4\ scan0101 | |
| Date | 3rd January 1936 | |
| - REAR SPRING - 4-OFF SPAN 50"0 FRONT EYE REAR EYE MAINPLATE .26 THICK 3.575 SPRING PAD REAR SPRING SPECIFICATION LOAD: 900 LBS WIDTH OF PLATES: 2 INCHES SPAN: 50" LOADED CAMBER: .5" NEG FREE CAMBER: 5" DEFLECTION DUE TO LOAD: 5 1/2" MAX BUMP NEGATIVE: 4 1/2" NOTE:- FOR REAR SPRING RANGE OF STRESS TO THE LOADED POSITION = 29.7 TONS ☐" " " " " " MAX BUMP " = 51.3 " " PARTICULARS OF REAR SPRING PLATE Nos | THICKNESS INCHES H&T | LENGTHS INCHES | ECCENTRIC DISTANCES INCHES 1 M.P. | .26 | 50+2EYES | NIL 2 | .26 | 48 7/8 | 9/16 3 x | .25 | 42 9/16 | 15/32 4 | .24 | 36 1/4 | 3/8 5 | .24 | 29 15/16 | 9/32 6 x | .23 | 23 1/8 | 3/16 7 | .23 | 17 5/16 | 5/32 8 | .22 | 11.0 | 1/16 TOTAL | 1.93 MAINPLATE GROUND - OTHER PLATES CONCAVE AND BUFFED. - FRONT SPRING - 4-OFF SPAN 35"0 FRONT EYE REAR EYE MAINPLATE .22 THICK 3.05 SPRING PAD FRONT SPRING SPECIFICATION LOAD: 700 LBS WIDTH OF PLATES: 1 1/2 INCHES SPAN: 35" LOADED CAMBER: .4" POS FREE CAMBER: 3.9" DEFLECTION DUE TO LOAD: 3 1/2" MAX BUMP NEGATIVE: 1.85" NOTE:- RANGE OF STRESS TO THE LOADED POSITION = 32.6 TONS ☐" " " " " " MAX BUMP " = 46.2 " " PARTICULARS OF FRONT SPRING PLATE Nos | THICKNESS INCHES H&T | LENGTHS INCHES | ECCENTRIC DISTANCES INCHES 1 M.P. | .22 | 35+2EYES | 1.0 2 | .22 | 34.0 | 1/2 3 x | .21 | 30 1/4 | 7/16 4 | .19 | 26 7/16 | 3/8 5 x | .18 | 22 5/8 | 5/16 6 | .16 | 18 1/8 | 1/4 7 x | .15 | 15 1/16 | 3/16 8 | .15 | 11 5/16 | 1/8 9 | .13 | 7 1/2 | 1/16 TOTAL | 1.63 MAINPLATE GROUND - OTHER PLATES CONCAVE AND BUFFED. LOW RATING SPECIAL ROAD SPRINGS FOR BENTLEY CHASSIS SCALE. HALF FULL SIZE DRAWING NO 174 REFERENCE. ROLLS-ROYCE LETTER HS{Lord Ernest Hives - Chair}/LES.14/KW DATED 1-1-36 THOS FIRTH & JOHN BROWN LTD SPRING DEPARTMENT TINSLEY - SHEFFIELD 3RD JANUARY - 1936 | ||