[Paddlewise] Group Paddling - folders stability

I've read that if foldables or hardshells are partially filled with water
then the sponsons make the foldable more stable. That makes sense from a
physics point of view. The foldable would be underdamped and the hardshell
very damped! I've not seen significant deformation in the Klepper expedition
sponson when submerged so not convinced that sponson deformation improves
stability. 

PeterO
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