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 report detailing deflection and permanent set measurements under increasing weight for an old type steering pivot, resulting in a stub axle fracture.
| Identifier | ExFiles\Box 2\12\ B002_X168-page011 | |
| Date | 26th February 1913 guessed | |
| A/W 584/3/24. 2.2.06. -4-3 2. Old type steering pivot used, we took one off 1649 for the job, same arrangement used for the test. Weight Deflection. A Deflection. B Permanent set. A Permanent set. B Remarks. 0 .000" .000" .000" .000" 400 lbs. .013" .005" .000" .001" 800 " .027" .008" .000" .001" Pivot which was at first slightly stiff became quite easy. 1200 " .021" .013" .004" .001" 1600 " .089" .019" .004" .001" 2000 " .119" .027" .004" .0015" 2400 " .135" .031" .005" .002" 2800 " .157" .037" .005" .002" 3200 " .183" .043" .008" .002" 4000 " .210" .049" .008" .002" 4400 " .236" .055" .008" .002" 4800 " .260" .062" .010" .003" 5200 " .285" .067" .010" .003" 5600 " .312" .074" .012" .0025" Pivot began to tighten gradually increasing with the weight. 6000 " .335" .081" .012" .004" 6400 " .363" .089" .012" .004" 6800 " .395" .095" .012" .004" 7200 " .418" .102" .012" .004" 7600 " .444" .108" .014" .004" 8000 " .472" .114" .016" .004" 8400 " .498" .122" .018" .005" 9200 " .579" .138" .023" .006" 9600 " .621" .145" .035" .0085" 10000 " .658" .157" .075" .010" 10400 " .737" .171" .110" .013" 10800 " .808" .183" .150" .018" 11200 " .875" .198" .195" .025" 11600 " .979" .213" .230" .031" 12000 " 1.120" .230" .345" .045" 12400 " 1.235" .297" .565" .090" 12800 " 1.450" .293" .695" .479" 13200 " 1.590" .368" .770" .988" 13600 " 1.760" .380" .925" 1.2" Stub axle broke clean in the neck, the metal looked crystaline & not in very good condition. Note that there was not so much deflection or permanent set as in the first one tested, which did not break. The deflections and permanent sets in the axle took place in the spring seat. [Diagram of a fractured part] Fracture | ||