Having been involved in litigation in the past (against a custom
homebuilder that defrauded me and several other people to the tune of
several million dollars) my advice is to cut your losses and move on.
The legal costs of suing Mr. Plank will far exceed your losses on his
product with no guarantee that you would recover any money. I also
believe that it would be virtually impossible to convince any of the
various government entities that Mr. Plank deliberately set out to
defraud anyone so I think that avenue is also a waste of time.
You can send the stuff back to him and hope he can resell it and send
you some money but I wouldn't hold my breath. Like you I am ethically
adverse to selling it to some unsuspecting soul out there. Personally
I am going to EBay the controller and trash everything else. The motor
is an unknown quantity except for the fact that it has brushes to
maintain so I am not interested in moving it inside the boat and using
it to drive a shaft and prop. I am going to pursue a Mars 3000 based
solution though it means undoing all of the work I put into removing
the prop shaft. There are several packaged systems using the motor and
some positive feedback from folks who have installed them.
I will keep this group updated as I progress with that project.
Regards,
Michael