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Don't quite know how I would put counter weights in the design, Ernest. If the door frame beam rotated then you could extend it out the ends of the Q hut and put beams and counterweights on it outside the building, but it does not. You might could put a massive counterweight inside the hangar at the center of the beam - but, I don't think I want that constantly hanging over me and airframe {:>). There is approx 5' height at center of door. So to counter balance a 600 lb door with its CG approx 4 1/2 feet out front I would need nearly 540lbs of counter weight inside the hanger one the end of a 5' beam. I think I'll pass {:>).
Could always happen of course, but with only 450 psi in lines that can take 4000 psi, I am not seriously concerned about a line bursting. My fall back position is simply to support the doors with two pipe/poles on each end of the beam. Could hinge them to the beam and have the fall into position after door is raised by pulling a rope to a latch or something similar.
Knowing nothing about hydraulics, I presume that should a line burst going to either cylinder then the pressure loss would be equal to both cylinders so the door should just come back closed fairly evenly. Even if the line burst completely apart, I would think it would take some time (at least a few seconds) for the fluid to be force out of the cylinder - hopefully giving time to at least get the heck out of the way.
Appreciate you comment, thought, can never have too many friends pointing out what might get'cha!
Ed
I was thinking I'd want counter weights on beams that run along the sides of the doors. They'd just stick up in the air. It would balance the load on the main support beam so that it is all compressive load, and in the event of a hydraulic rupture, there'd not be so much destructive weight coming down.
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