: 10 lb paddle just so some 200 lb person can
: put 150lbs in the center of the paddle.

I tried 250#, all my weight plus a lot of bounce for good measure. The calculator suggested using solid titanium.

Then I tried to reverse engineer a wood shaft. Allowing 6000psi for the wood, I figure you can put 50# in the middle. That seems light, but I really have no idea how much force rolling and aggressive bracing require. It sure seems like a lot of force at the time.

Anyone with numbers, please step forward!