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 with suggestions for the lightest possible front and rear springs for a Bentley car.
| Identifier | ExFiles\Box 87\4\ scan0055 | |
| Date | 29th January 1935 | |
| BENTLEY REAR SPRING - 3-PLATES LOAD = 900 LBS WIDTH OF PLATES = 2 INCHES SPAN = 50" LOADED CAMBER = 1 3/4" NEG FREE " = 2 1/4" POS DEFLECTION DUE TO LOAD = 4 INCHES PLATE Nos | THICKNESS INS | LENGTHS INS | ECC. DIST INS 1 MP | .38 | 50 + EYES | NIL 2 | .37 | 49.0 | 1/2 3 | .35 | 26 5/16 | 7/32 TOTAL | 1.10 ALL PLATES GROUND. THICKNESSES CALCULATED. FRONT EYE REAR EYE Existing Standard Clip ¢ 1'-7" Existing Standard Clip ¢ 9 3/4" Existing Standard Clip ¢ 10" Existing Standard Clip ¢ 1'-7 3/4" 25" 1'-7" 10" 10" 1'-7 3/4" 25" PAD 0.5" x 3/8" .38" MAINPLATE. WITH RANGE OF STRESS 30.6 TONS PER SQ INCH. NOTE:- THE CALCULATED FINISHED WEIGHT OF THIS SPRING 28 LBS (APPROX) BENTLEY FRONT SPRING - 3-PLATES LOAD = 700 LBS WIDTH OF PLATES = 1 1/2" SPAN = 35" LOADED CAMBER = NIL FREE " = 2 1/4" DEFLECTION DUE TO LOAD = 2 1/4" PLATE Nos | THICKNESS INS | LENGTHS INS | ECC. DIST INS 1 MP | .31 | 35.0 + EYES | 1.0 2 | .30 | 34.0 | 1/2 3 | .29 | 18 1/2 | 1/4 TOTAL | .90 ALL PLATES GROUND. THICKNESSES CALCULATED FRONT EYE REAR EYE Existing Standard Clip ¢ 13 1/2" Existing Standard Clip ¢ 9 15/16" Existing Standard Clip ¢ 6 3/8" Existing Standard Clip ¢ 14 1/4" Existing Standard Clip ¢ 10 1/4" Existing Standard Clip ¢ 6 3/8" 16 1/2" 13 1/2" 6 3/8" 6 3/8" 14 1/4" 18 1/2" PAD 3.05" .31 MAINPLATE. WITH RANGE OF STRESS 29.6 TONS SQ. INCH NOTE:- THE CALCULATED FINISHED WEIGHT OF THIS SPRING 19.5 LBS (APPROX) SUGGESTIONS FOR LIGHTEST POSSIBLE SPRINGS FOR THE BENTLEY CAR - IF FINISHED WEIGHT IS OF SUPREME IMPORTANCE REFERENCE ROLLS-ROYCE LETTER FROM EXPERIMENTAL DEPT DATED 17-1-35 SCALE HALF FULL SIZE DRAWING No 123 THOS FIRTH & JOHN BROWN LTD SPRING DEPARTMENT DUNLOP STREET TINSLEY SHEFFIELD. 29TH JANUARY 1935 | ||