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Low stability of Dugouts
I am missing a section on the stability of Dugouts. It has been argued that due to their round hulls, they are very unstable. As a physicist I can clear see this, but I have no references.
A crude analysis of the buoyancy and gravitational responses to perturbation, quickly reveals it as a very unstable construction. Because the center of gravity and the attack point of the buoyancy force, will always be aligned vertical in a round-hulled boat. There will be almost no horizontal force-component to re-stabilze a perturbed logboat. It can be accounted for (somewhat), by carving a flat 'boat-floor' (dont know the technical terms), but not much.
I therefore doubt that round-hulled logboats could carry 8-10+ people across many miles of open ocean. What are the observations of todays indigenous peoples uses of logboats? Do it require a high skill level to manoeuvre? What do they do - if anything - to counterbalance the low stability of a round hull?