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).
Graph showing frame twisting test results comparing standard, x-membered, and 4-point mounting configurations.
| Identifier | ExFiles\Box 17\3\ Scan292 | |
| Date | 5th July 1928 guessed | |
| FOR THESE TESTS THE FRAME WAS SUPPORTED AT THE REAR ON JACKS THEREBY ELIMINATING THE FLEXIBILITY OF THE REAR SPRINGS. LOAD STANDARD FRAME PLUS X MEMBER UNDER RADIATOR PLUS 4 POINT MOUNTING TORQUE LBS. FT FIGURES REPRESENT MEAN OF FRAME TWISTED FIRST CLOCKWISE AND THEN ANTI-CLOCKWISE. FRAME TWISTED FROM HORIZONTAL DEGREES θ | ||