I was using them to protect my phantom 2 while practicing weaving in and out of trees. Saved my props a couple of times. Didn't bother to take them off when I was about 350 feet up here one day during, during a rapid descent I got into the wobble and could not get back out of it, crashed in the trees. Luckily it was only about 20 feet off the road 6 feet off the ground.
Tried another experiment with it, got about 40 feet off the ground, one into a fast descent, it did the same wobble. Pull them off not going to use them again.
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