The floats are cylindrical, barrel-shaped, and will demonstrate a non-linear flotation/force curve. Unlike linear fixed-rate springs. As the float starts to submerge, it only displaces a small amount of fluid. When it has submerged halfway, it's displacement rate is maxed, since that's the largest part of the float. After that, continuing to submerge, it's flotation rate reduces since its width decreases. Being a circular shape, its flotation/force curve will be somewhat sinusoidal.
This graph shows what the expected buoyancy curve would look like for our 30mm diameter floats, from zero to 30mm fully submerged.
This graph shows what the expected buoyancy curve would look like for our 30mm diameter floats, from zero to 30mm fully submerged.