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Explosive bolts are a personal fave. Where and how are they deployed without causing a water deluge?
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I was thinking of a cap with four or five supports that moves vertically. Since that would shade the solar collector, I've moved on to a housing on the North side with pivot points to the East and West for a a retractable segmented lid. Now I'm not sure about a fail-proof actuator.
A dome won't sway. The summit is constrained by the [concentricity?].
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2500 gallons is several tons accelerating
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Where did that number come from? The (double-hulled California) swimming pool?