On Jul 3, 3:54*pm, Brian Whatcott wrote:
In responding to the anonymous poster's load test anxiety, I let the
facts run away from me.

Here is the test question:
You have supported a 1000 lb airplane upside down, and wish to apply a
4g load test.
How much weight do you add to the wings etc.?

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Hands up, all who said 3000 lb.
* * * * * * * * * * * * * * * * *Correct!
* * * * * * * * * * * * * * * * * * * * * * *The airframe is already
supporting its own (1g) weight. * :-)

Brian W

Glad someone raised this topic. Too lazy to do it myself. Assuming
a LSA gross wt. aircraft (1320 lbs.) with a wing that weighs 200 lbs.
and you want to test the wing for 4 g's. 4 possible
scenarios.....The first three I have seen in "reputable"
publications...you know...the ones you have to PAY for. The 4th one
is the only other one I could think of. I think we've decided #1 is
wrong. Turning the plane upside down and supporting the frame on the
fuselage. How many bags of manure do you pile on the wing to test.
Assumptions: each bag of manure weighs 1 lb.

Scenario #1 1320 x 4 ( 5280 )
Scenario #2 1320 - 200 x 4 ( 4480 )
Scenario #3 1320 - 200 x 4 + 200 ( 4680 )
Scenario #4 1320 x 4 - 200 ( 5080 )

Neal F.