Inflateable SUP, Foil SUP planing wedgies

If you run a stream of water over the under side of a spoon that jet of water curves to follow the surface of the spoon. This is called the Coanda effect and it's why SUPs are so sticky and don't plane properly, the water doesn't release cleanly off the curves at the back end of a SUP.

Print a batch of these, fix them on and get a performance boost! I made them 120mm long so that they can be printed to suit the curve of a SUP.