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).
Hydraulic jack system for the Wraith III chassis, comparing components with the Phantom III.
| Identifier | ExFiles\Box 140\2\ scan0024 | |
| Date | 25th June 1937 | |
| cycle this note SECRET. 1166 Rm.{William Robotham - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} HPS.{Horace Percy Smith - Experimental Factory Mgr} E/Lid.{A. J. Lidsey} E/HDY.{William Hardy} GRY.{Shadwell Grylls} E/Ev.{Ivan Evernden - coachwork}1/M.25.6.37. WRAITH III. HYDRAULIC JACKS. ------------------------- It is now considered that the Wraith III. chassis shall be equipped with Phantom III. type Sessions Hydraulic Jacks. The front jack FW.298 shown on N.Sch.4818 is identical with the Phantom III. jack F.88226, with the exception of the position of the screw thread on the outer barrel. We regret that we see no way of modifying the jack bracket on the frame so that identically the same jack can be used on both Phantom III. and Wraith III. The front jacks are called for on the L.O.P. of the frame. The rear jack is G.83984 and is absolutely the same on both Phantom III. and Wraith III. The arrangement of the jack and its mounting on the axle is shown on N.Sch.4995 and the subsequent modification to the jack bracket on LeC.5721. The rear jack is called for on the L.O.P. of the rear axle. The scheme for the mounting of the present standard Phantom III. jack pump is shown on N.Sch.4874, and this was to be used in conjunction with the sheet metal floorboards. We consider that all this has been made obsolete by subsequent designs. The mounting for the standard Sessions jack pump in conjunction with the latest floorboards of the Buick type N.Sch.5074 and N.Sch.5075 is shown on N.Sch.5172, and we suggest that this is the scheme which we should use. The piping for the jack system is not absolutely complete, but the piping on the frame is materially correct where shown on the various sheets of LeC.5353. We understand that a print of a scheme showing the piping on the springs and rear axle has been handed to the Experimental Dept. some short while ago, and that this scheme is materially correct except for the shape of the axle tube. The drawing number is N.Sch.5005, and this scheme in a corrected form will be issued for detailing as soon as possible. We believe that the above outlines the whole of the Wraith III. jack situation up to date. E/HSP | ||