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).
Suggestions for lightest front and rear springs for a Bentley car.
| Identifier | ExFiles\Box 87\4\ scan0073 | |
| Date | 25th January 1935 | |
| BENTLEY REAR SPRING - 2-OFF FOR TRIAL - 4-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 FRONT EYE Existing Standard Clip C/L 1'-7" Existing Standard Clip C/L 9 1/2" Existing Standard Clip C/L 10" Existing Standard Clip C/L 1'-7 3/4" 25" 1'-7" 11" 1'-7 3/4" 25" PAD 3.075" NOTE:- THE CALCULATED FINISHED WEIGHT OF THIS SPRING 29 1/2 LBS (APPROX) '35 MAINPLATE. WITH RANGE OF STRESS OF 29.1 TONS PER SQ. INCH. REAR EYE PLATE Nos / THICKNESS INS / LENGTHS INS / ECC. DIST INS 1 MP / .35 / 50.0 + EYES / NIL 2 x / .34 / 49.0 / 1/2 3 x / .33 / 33 3/4 / 5/16 4 / .33 / 18 1/8 / 5/32 TOTAL / 1.35 ALL PLATES GROUND. THICKNESSES CALCULATED BENTLEY FRONT SPRING - 2-OFF FOR TRIAL - 4-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" FRONT EYE Existing Standard Clip C/L 13 1/2" Existing Standard Clip C/L 9 5/16" Existing Standard Clip C/L 6 3/8" Existing Standard Clip C/L 14 1/2" Existing Standard Clip C/L 10 1/4" Existing Standard Clip C/L 6 3/8" 16 1/2" 13 1/2" 8 3/8" 18 1/2" 14 1/2" 8 3/8" PAD 3.05" NOTE: THE CALCULATED FINISHED WEIGHT OF THIS SPRING IS 13 1/2 LBS (APPROX) '29 MAINPLATE. WITH RANGE OF STRESS 27.22 TONS.SQ.IN REAR EYE PLATE Nos / THICKNESS INS / LENGTHS INS / ECC. DIST INS 1.MP. / .29 / 35.0 + EYES / 1.0 2 / .28 / 34.0 / 1/2 3 / .26 / 23 3/4 / 5/16 4 / .26 / 13 1/8 / 1/16 TOTAL / 1.09 ALL PLATES GROUND. THICKNESSES CALCULATED SUGGESTIONS FOR LIGHTEST SPRINGS FOR BENTLEY CAR REFERENCE ROLLS-ROYCE LETTER FROM EXPERIMENTAL DEPT DATED 17-1-35' SCALE HALF FULL SIZE DRAWING No 122 THOS. FIRTH & JOHN BROWN LTD SPRING DEPARTMENT DUNLOP STREET TINSLEY SHEFFIELD 25TH JANUARY 1935 | ||