I sat down one day and started building a paddle no plans no clue but it came out just beautiful shes not scale and has her little problems, I made my own wheel cut three disc cut slots and planked it. I used a 6v airplane motor with gear reduction and a large oring with two wood pulleies. Ill try to put up some pics.

On the wheel it is double planked dont glue till you spin it a little and check balance