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).
Secret memo detailing design alterations for the Wraith III back axle to save cost.
| Identifier | ExFiles\Box 7\3\ X 602 Axle Rear-page35 | |
| Date | 17th March 1937 | |
| Smith 602. BT.{Capt. J. S. Burt - Engineer} SECRET. C.E. De. Rm.{William Robotham - Chief Engineer} HFS. E/HDY.{William Hardy}S/HP.17.3.37. Wraith III Back Axle. We send herewith N.Sch.5084 showing the nearside end plate integral with the crown wheel bearing housing and the inner spigot for the centre casing, to save cost. We also indicate that all of the bolts for both the flange for the tube and the flange for the centre casing are to have 1/32" clearance holes. The use of hexagon heads makes an alteration to the bolt retaining plate necessary. Square heads are retained for the axle tube bolts as it seems to be unlikely that hexagon heads can be stopped from rotating by an unmachined sheet metal plate. The same plate can now be used on both side of the axle casing. These alterations are equally applicable both to the Phantom III and 25/30. E/HDY.{William Hardy} N.Sch.5084 herewith. | ||