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 and data table showing the results of torsion tests on the 'Myth' frame.
| Identifier | ExFiles\Box 110\2\ scan0063 | |
| Date | 22th December 1943 | |
| TORSION TESTS ON MYTH FRAME Table: Key | Test. | Date. | Rate between front and rear wheels. | Remarks. --- | --- | --- | --- | --- Solid Line | 1 | -/12/41 | 394 lb.ft/degree | as RF.2259. Dashed Line | 2 | 14/12/43 | 538 lb.ft/degree | Front member boxed in to PL.1127. Dot-Dash Line | 3 | 20/12/43 | 509 lb.ft/degree | As test 2, but with additional tack-welding between side members, cruciform and 2nd. cross member. NOTES (a) Front Pan (which is to be rubber mounted) was not fitted for these tests. (b) Torque actually applied was 268 lb.ft. for test 1, and 406 lb.ft. for tests 2 and 3. Graph Text: Y-Axis: TWIST PER 1000 LB-FT (DEGREES RELATIVE TO REAR WHEELS) X-Axis: DISTANCE FROM FRONT WHEELS (INCHES) Graph Labels (along X-axis): FRONT WHEELS FRONT BODY MOUNTING BRACKETS CENTRE OF CRUCIFORM 2ND. BODY MOUNTING BRACKETS REAR WHEELS FRONT OF REARMOST CROSSMEMBER Data point annotations on graph (for tests 1, 2, 3 respectively): At 'FRONT BODY MOUNTING BRACKETS': 1228, 1270, 1140 and 894, 812, 688 At '2ND. BODY MOUNTING BRACKETS': 2610, 2820, 2420 At 'FRONT OF REARMOST CROSSMEMBER': 1378, 1475, 1140 Footer Text: FJH{Fred J. Hardy - Chief Dev. Engineer} / GB / JCC | ||