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).
The design, modification, and material requirements for Wraith II roll rods.
| Identifier | ExFiles\Box 9\5\ 05-page223 | |
| Date | 4th October 1938 | |
| 646 also 1306 To Hy{Tom Haldenby - Plant Engineer}/Ald.{F. Allwood - Experimental Design} from RM{William Robotham - Chief Engineer}/APM. c.c. HJS. c.c. By/MAB. c.c. Da.{Bernard Day - Chassis Design} c.c. De/JD.{J. Draper - Frames} c.c. RM{William Robotham - Chief Engineer}/WJM. RM{William Robotham - Chief Engineer}/APM.7/WH.4.10.38. WRAITH II ROLL RODS. With the introduction of 8" deflection front springs a front roll rod is necessary. As on B.lll, it may be necessary to retain the rear roll rod; but the two rods together make the car unnecessarily stiff against roll. Will you please detail and instruct two pairs of rods similar to F.873 and F.1509 only .650" dia. each instead of .750" dia. and .737 dia. respectively. This will nearly halve the roll rate At the same time will you please modify the front roll rod F.1509 to conform to the B.lll and W.80 rods, i.e. the ends need not be detachable. The form of these new rods is shown on FCD.802 or FCD.767. The front rod need not be made in S/M.4 but can be made in S/N. The stress in the thinner rod is lower. RM{William Robotham - Chief Engineer}/APM. | ||