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How to distribute sandbags for load testing

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Well-Known Member
Jun 13, 2015
kuttawa, ky
I have a design that I wanttobuild.
It is a modification of an existing design.
I would like to test the spar, and it’s attachment.
MTOW is 500 lbs.
How much weight should I load on each wing, and how do I distribute the test load.
Thanks in advance for any assistance from the viewing audience