Inside the fibreglass hull, the heaviest parts sit at the bottom: the engine, batteries and fuel tank. They drag the centre of gravity low in the hull instead of leaving it in the middle. Higher up, the hull is injected with foam, and together with the enclosed air this is where much of the boat’s buoyancy comes from.
Once the boat is in the water, its weight pulls it down while buoyancy pushes it back up. If the weight ever won out, the boat would sink. What matters next is where those forces act: the weight through the centre of gravity, and the buoyancy through the centre of buoyancy.
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