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Sure wish I was next door! May want to consider the thrust velocity relative to the weight of your boat. Too much power? I don't know if you've experimented with rocketry, but I'd be tempted to make my own engines with slower burn rate rates, too. If you don't mind keep me updated.
You might want to try vectoring the thrust rather than dealing with foils submerged in water. It would easier to do and probably more forgiving.Nice job! Great fun!
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