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).
Instructions for fitting lower-rated springs with increased deflection to the side steering tubes on a Phantom Chassis.
| Identifier | ExFiles\Box 68\1\ scan0184 | |
| Date | 16th November 1926 | |
| C. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 48450 BY/HEBg/M.16.11.26.Hs{Lord Ernest Hives - Chair} RECEIVED NOV-16 1926 PHANTOM CHASSIS. SIDE STEERING TUBE SEC:7070. Please receive herewith two Blue Prints of each of the following:- F.76108 Scheme for fitting Lower Rated Springs with Increased Deflection in Existing Side Steering Tubes. F.76109 Side Steering Tube. 1 off per chassis. F.76110 Spring for Side Steering Tube. 4 " " " F.76111 Outer Plug. 2 " " " F.76112 Inner Plug. 2 " " " Kindly instruct for each of the above to be produced and fitted Experimentally, noting that they are in accordance with Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}'s requirements, namely to obtain an arrangement with Springs of 1500 lbs/inch rating and .200 deflection. The Spring space was somewhat restricted, but we have obtained a spring giving as near as possible the specification proposed by Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}, as follows:- | | SPECIFICATION OF SPRING AS REQ'D: BY Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | SPECIFICATION OF SPRING AS DRAWN(F76110) | |---|---|---| | RATE. | 1500 lbs/inch. | 1400 lbs/inch. | | DEFLECTION (NORMAL POSITION TO STOPS) | .200 | .200 | | NORMAL LOAD. | 300 lbs. | 275 lbs. | | MAXIMUM LOAD. | 562 lbs. | 550 lbs. | | MAXIMUM STRESS. | If possible to be less than 86,000. | 84,100 | In addition to the parts issued herewith, the following parts (issued for scheme F.75841) will also be required:- F.75843 Cover for Side Steering Tube Joint. 2 off per chassis F.75844 End Nut. 2 " " " F.75850 Locking Bracket. 2 " " " F.75851 Cap for Locking Bracket. 2 " " " -Cont'd- | ||