It was with great hesitation that I would ever put holes through the hull but I have epoxied in place some 1.5" brass rings that are threaded internally. Through that I am trying some different designs. The first is a siphon nozzle. The valve was extracted from a garden water faucet soldered to another brass threaded mount that fits the hull ring. So far it works unless I forget to put them in before launch. When they run it sounds like an espresso machine screaming away.
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