Last summer's project.
Old surfboard 24" x 14ft $50
Minn Kota 12v 30Lb thrust trolling motor from WalMart $99
Waterproof battery box (Walmart) $15
Some fiberglass and epoxy $15
It worked but was slow so we used it with 22V 6S 10,000mAh Lipo and it worked for a while before the internal...