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).
Modifications to the Phantom III front suspension to accommodate Wraith II wheel movement.
| Identifier | ExFiles\Box 95\2\ scan0178 | |
| Date | 23th February 1937 | |
| SECRET. To EY. Copy to De. Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} HFS. RM{William Robotham - Chief Engineer}/Lcs. E/Ev.{Ivan Evernden - coachwork}2/MN.23.2.37. 346/ Phantom III Front Suspension with Wraith II Wheel Movement. We have already sent you the lightened upper triangle levers for the Wraith II wheel movement on Phantom III. We now send you herewith N.Sch.5054 which shows a modified top triangle bearing shortened in length in order that the full lock of 38° may be obtained; although the Phantom III was designed originally for 41° we understand from the Works that only 38° is actually obtained. The yoke piece is unaltered and so are the lightened upper triangle lever forgings. The machining, however, of the triangle levers is slightly modified, and the size of the bearings has been reduced by the use of felt rings in the place of "Perfect" oil seals. On this drawing we show how it is proposed that the clamping bolts on the top of the yoke piece may be tightened. There would appear to be two methods of doing this but in both cases we have to assume that the upper yoke piece bearing to the top triangles is the first one to be built up. This is enforced upon us by the fact that the yoke piece has to be pivoted about its upper bearing either outwards or inwards in order that a box spanner may be used on the nuts of the clamping bolts. Ev.{Ivan Evernden - coachwork} Att: N.Sch.5054. | ||