How do you perform a static load test on a wing?

I'm looking for advice on how to do a static G-load stress test of a wing. Support 2/3 span and hang a weight off the tow hook equal to the breaking strength of the winch line? Or calculate the load and use sandbags with the wing upside down like full scale testing? Ultimately, what load should be considered for Thermal Duration? At what higher load should the wing be allowed to fail?

From : Don Stackhouse

We generally test to at least the equivalent of about 200 lbs.. We support one half of the wing upside down in a fixture and clamp it in place with sandbags, then load the other wing (the one hanging out into space) with 100+ pounds of sandbags, stacked to approximate an elliptical load distribution. Alternatively we have supported the wing in the middle and loaded the entire wing. Either way it's a scary test. The biggest problem sometimes is keeping the sandbags from sliding off the tips as they begin to sag. We tested the 2-meter Monarch to a somewhat higher load, and the tip bent down about a foot! It also came back to the original position when the load was removed (BTW, this check is a very important part of the test). The main criteria is the expected strength of the towlines that the model will see, plus a safety factor.

Once the model has passed this test, the next test is an abusive flight test on a winch. Static tests are a good start, but you must verify that the test was representative of real life.

Don Stackhouse @ DJ Aerotech