Be careful there Butch, you might (and me too) find yourself in some litigation from the self-esteemed challenged. We're not suppossed to laugh at people anymore.
A few years ago, while trying to find myself (actually just had some screwing-around time), I took a plastic propeller from a model airplane and afixed it to my WeedEater. I have now behind my canoe the SeaWeeder(trademark mine). A two-cycle outboard any Indonesian fisherman would kill for. Two days and many many miles on a quart of fuel, the bane of the local Game Warden (no registration numbers on a 13-foot canoe).
Stihl makes the best basic frame...there's a lot of torque when set on "full ahead steam". About six miles per hour (five point five knots). The mount is from old mattress frames, a standard pinned door-jam hinge my steering pivot. I set the trigger with a tensioner for "auto pilot", and extended the tiller from a broom handle, capable of receiving command from my big and next biggest toe so a beer can be held (and consumed) by my navigation free-hand.
Now, to Mexico to find some pet Squirrel monkeys trainable to pick ball moss from live oaks. Hell with no Social Security when my time comes, I've got some tools.
Later.