Dimensions and required modifications for the Wraith III front engine support rubbers.
| Identifier | ExFiles\Box 8\7\ 07-page68 | |
| Date | 16th March 1938 | |
| RV/RS {Sir Henry Royce's Secretary} c. RM. {William Robotham - Chief Engineer} c. HFS. cr {Mr Cra’ster / Mr Chichester} --- 622 DA. {Bernard Day - Chassis Design} 9/G.16.3.38. [Signature] WRAITH III. FRONT ENGINE SUPPORT RUBBERS. FW.1018. Referring to the question of these rubbers overflowing the support flange when tightened up in position, this appears to be due to the rubbers being oversize, especially on the nominal .725 part, which comes out at .775. We suggest that this .775 should be reduced in length, say to .740 or so, and tried up until a suitable length is found, which will just flow beyond the outline of the flange support. In future we suggest the rubbers should be made to the dimensions of the attached sketch, which allows no compression on the .725 long bush part, but only on the flange part. DA. {Bernard Day - Chassis Design} | ||
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).