RE: windsock
I'm not sure how long the frame had been up at our field, but one of the guys took it out a couple weeks back. It was nowhere as strong as the the one I just put up. I pity the plane that hits this one.
The old one also had a "pre-fill" setup so about 10" or so was always inflated. The Owls and Vultures loved it. The top of a new sock would shreaded in a couple weeks. We left them up until they blew off. I"m hopping that this design prevents the bird damage. Time will tell.
Don