10-17-2017, 03:41 PM
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Craftsman
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Join Date: Sep 2015
Posts: 174
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And I've had terrific results with these as gas containment/direction tubes, mounted in front of D motors (they fit into the centering ring/engine block nicely) to better direct the booster blow-through upward to the next nozzle when gap staging. The way I look at it, anything that improves reliability can't be bad.
My theory: The smaller BT20 "tough tube" keeps the hot gas contained in a smaller volume, does not let it expand and cool off as much, and points the hot gas straight at the nozzle and not all over the interstage area. The tough tubes stand up well to the abuse of hot-gas-straight-from-the-combustion-chamber.
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