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I believe Carl's design was intended to also limit bow rise during the transition from displacement to planing speed, thus the slower draining forward chamber. I think the PT Skiff's tank is only designed to keep it from rolling excessively at rest.
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A two compartment design also limits instability due to free surface effect of a partly filled tank. The PT design appears to be more prone to porpoising as the ballast transitions from full to empty and vice versus.