UltraCruiser Stress Testing

UC on test fixture.

Simple tape measure to record deflection.

Support of carry-thru.

50# bags of salt are used.

400# and 3" deflected.

650# on the wing.

4" deflected.

We kept an eye on the carry-thru and skins as we added weight.

850# on the wing.

4.75" deflected.

1000#

5.5" deflected.

1400#

8.75" deflected.

1540#

9.5" deflected and we heard a "noise", something like a muffled pop.

The center carry-thru support on the right side buckled under compression.

This is the view of the top aft skin at 6 G's

We reconfigured the UC to test the stab.

The stab with 120# which is equal to a 6 G loading with a 170 lb pilot.