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).
The third torsional stiffness test carried out on the Myth Frame.
| Identifier | ExFiles\Box 110\2\ scan0062 | |
| Date | 16th February 1944 | |
| To: RA. From RM{William Robotham - Chief Engineer}/GB. Cc. to EV.{Ivan Evernden - coachwork} Cc. to Hys. Cc. to RV/SD. Cc. to RV/DB.{Donald Bastow - Suspensions} Cc. to RV/HL. Cc. to Wgm/Cr.{Mr Cra???ster / Mr Chichester} Carfile 727 RM{William Robotham - Chief Engineer}/GB.2/HL. 16.2.44. Myth Frame. A third torsional stiffness test has been carried out on the Myth Frame. The changes made between the 2nd. and 3rd. tests were. (a) The second cross-member was tack welded by gas to the side members where the original electrical tack welding had been faulty. (b) The side member boxing was tack welded by gas to the side members for about 12" ahead of the cruciform. Both top and bottom faces were done. The effect of these changes was to reduce the stiffness of the frame slightly (see attached graph). It is thought that the reason for this is that gas welding always causes some buckling of the surfaces. For this reason we do not want it on production. We had to accept it at Olan owing to the absence of alternative methods. GB RM{William Robotham - Chief Engineer}/GB. | ||