Quote:
Originally Posted by glenn654
Is there a computer program available that may be used to test a hypothesis of the failure sequence and forces applies in the process?
Glenn Wilkinson
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Good question - -
Looking at both accident pictures and reports the sequence of failure suggested for the VS/rudder seems consistent with the pictures and comments in the structural NTSB report. Not sure when the counterweight might have separated, though. They did state (hint?) that "much" could have happened between radar return points. Looking at the plot of time vs G loading, it was not a rapidly increasing G loading. Unless the AC was not relatively stable roll wise. It seems a lack of g loading early in the maneuver allowed the speed to build up anyway. I don't understand the "roll" graph they had, and it could totally change the picture. It seems like the roll (presumably inverted) and pull to breakup was 6 seconds.
Bent stick. Either forward or backward, the loading case prior to impact would be normal force at the handle and a torque at the base. That kind of load yields a maximum bending stress at the pivot. So, if pilot forces were to bend it, it would not be nicely bent in the middle. Honestly, it looked like impact damage to me. Maybe someone would know if the stick was always bent that way.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 06-19-2015 at 07:59 PM.
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