Modification to holes in the chassis frame cruciform to provide clearance for exhaust pipes on the Wraith III model.
| Identifier | ExFiles\Box 8\8\ 08-page25 | |
| Date | 29th November 1937 | |
| 623 DF/BC c. Rm. {William Robotham - Chief Engineer} DA. {Bernard Day - Chassis Design} 5/G.29.11.37. WRAITH III. HOLES IN CHASSIS FRAME CRUCIFORM TO CLEAR EXHAUST PIPES. We send herewith E.CD.258 Modification to Exhaust Pipe holes in Cruciform Torque Member Side Plates. Wraith III. The holes in cross for exhaust pipes were shown 3.250" deep on the design drawings of the exhaust pipes, although in order to use standard punches for holes they were reduced to 3.000" deep on the frame designs. Owing to engine movement combined with assembly limits and sagging of supports and pipes, there are signs of the exhaust pipes having rubbed on the metal of the frame members after the cars have been on the road. In order to give increased clearances and still use a standard size of punch, we have increased the depth of the holes in frame cross by .500 making them 3.500 deep, keeping the centre lines of the holes as now. Will you please modify the details to suit this alteration as soon as possible. DA. {Bernard Day - Chassis Design} WYMAN | ||
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).