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).
Test results for Goshawk pendulum levers, showing torsion, deflection, and permanent set under various weights.
| Identifier | ExFiles\Box 49\4\ Scan121 | |
| Date | 17th May 1931 | |
| X4263 S18/17/5/31 X2263 (crossed out) X205 X4264 GOSHAWK - PENDULUM LEVERS. Test hanging weights on ball end. Weight. Torsion. Deflection. Permanent set. Lever End. Ball End. 200 lbs. .043 .038 300 " .116 .105 400 " .158 .144 500 " .221 .210 600 " .291 .286 .005 .005 700 " .363 .330 .015 .015 800 " .430 .402 .030 .030 900 " .523 .474 .036 .036 1000 " .595 .536 .056 .056 1100 " .654 .595 .080 .082 1200 " .723 .670 .061 .065 1300 " .795 .715 .072 .078 1400 " .824 .755 .068 .073 1500 " .855 .785 .077 .086 1600 " .915 .840 .081 .093 1700 " 1.030 .944 .110 .122 1800 " 1.200 1.064 .198 .204 1900 " 1.444 1.376 .207 .213 2000 " 1.604 1.498 .296 .302 | ||