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Even with all the calculation mumbo jumbo each plugs wood density will vary. Still you will need to make several prototypes to come close to achieving the desired sink rate or lack there of. It all comes down to prototypes and testing more than calculations of water displacement and blah, blah, blah. Any current, moving water, incoming tides and outgoing tides will affect such a plugs sink ratio so it will be a tough one to nail.
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