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#17
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[Cross posting list trimmed]
Musky wrote: Rollers, folders.... all asking for trouble. Why not a garage-door style door, single piece and folding upward with help from low-tech springs? That's what we recommend for county hangars. Very low maintenance, can be automated, and don't flop around in the wind. We have a large one of those on the hanger we're in at the moment, on the order of 50 x 25. No springs; a series of cables runs from the top of the door to a large counterweight; attached to the bottom of the counterweight is a cable to a _small_ winch (of the sort usually used to move small boats onto trailers) that is used to raise and lower the door. It works great; I just don't want to be around if the thing ever decides to let loose. From the looks of the counterweight the thing isn't precisely "light". |
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