/diy/ - Do It Yourself

there used to be a diy boat thread a while back and I thought I'd make a new one.

I think this summer I will attemp making one for less than 400$ I hope, it shouldnt be that hard. I'm not including the budget for an engine.

I saw a guy selling a homemade pedal kit on craigslists that has a sort of circular pump which is pushing air into a hose and later in a kind of air tool which is spinning the propeller.

idk how efficient his design was, but if you gear it down good decent torque and rpms from such a funny contraption