I have retired the leash I made with dyneema and surgical tubing inside - too stretchy. I might convert it into a wing leash, seems like the stretch profile will be nice for that.
I made a new one, this time using 4mm Polyurethane cord stock snaked through the inside of 5/32" dyneema. (Polyurethane is the same thing normal leashes are made out of, just usually thicker than 4mm) I set it up for about 25% total stretch before the dyneema bottoms out. I got it out in big overhead swell with my 8’ standup downwind foil board yesterday and the pull is a lot smoother when the board gets taken by a wave. It is pretty lightweight and just stiff enough not to get tangled. Time will tell, but I think this is the formula.
