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).
Design for a suggested 7-plate Phantom III rear road spring for experimental purposes.
| Identifier | ExFiles\Box 95\2\ scan0197 | |
| Date | 11th December 1936 | |
| SUGGESTED 7-PLATE PHANTOM III REAR ROAD SPRING FOR EXPERIMENTAL PURPOSES SCALE HALF FULL SIZE NOTE:- FOR OTHER DETAILS SEE DRAWING N. F89060 FRONT EYE REAR EYE 66" SPAN POSITION OF LUBRICATION FEED BOSS ALL TAPERS 3 1/2" S'OSO SPRING SEAT CENTRE BOLT HERE MAINPLATE THICKNESS .34" — DATA — LOADS 1350 LBS. 2-OFF. 1550 LBS. 2-OFF WIDTH OF PLATES 2 1/2" SPAN 66" LOADED CAMBER .375" NEGATIVE FREE " 6.625" DEFLECTION DUE TO LOAD 7.0" MAXIMUM BUMP BELOW LOADED POSITION = 4.625 NOTE:- RANGE OF STRESS TO THE LOADED POSITION = 28.4 TONS PER SQ INCH " " " " " MAX BUMP " = 47.1 " " " " TAPERS SHEWN VIZ 3 1/2" ARE MAX POSSIBLE WITH EXISTING SNOW GRINDER ARROWS INDICATE POSITIONS OF CLIPS ON STANDARD DESIGN F89060 NOTE:- THICKNESSES SHEWN ARE GROUND FLAT. NO CONCAVE PLATE THICKNESSES REQUIRED FOR PLATE Nos | 1350 LBS | 1550 LBS | LENGTHS INCHES | ECC. DIST INCHES 1 | .34" | .34" | 66.0 & EYES | NIL 2 | .33" | .34" | 62 3/4" | 7/8 3 | .32" | .34" | 53 1/4" | NIL 4 | .32" | .34" | 43 3/4" | " 5 | .31" | .33" | 34 1/8" | " 6 | .31" | .33" | 24 7/8" | " 7 | .31" | .33" | 15.0" | " TOTAL | 2.24" | 2.35" REFERENCE ROLLS-ROYCE LETTER Rm{William Robotham - Chief Engineer}/LES.14/J.H DATED 9/12/36 THOS FIRTH & JOHN BROWN LTD SPRING DEPARTMENT TINSLEY - SHEFFIELD 11TH DECEMBER 1936 DRAWING N. 201 AS FOR POUNDAGE 1350 | ||