thx all,
a keel might do, but I'm thinking that sometimes the physics of small objects don't directly translate from large objects
I also considered an r/c operated rudder. A lot of things to consider
That was just my first try. The boom will get to the optimal length. Absent success there, cat whisker on one or both sides. Cat whisker would be a piano wire swept back at say, 30 degrees below waterline, where it'd be unseen
right now, I was just stoked getting the thing to work on the first try. I also need to put some batteries in the critter pulling it. Four AAs normally last for a full day's run or more
Also, instead of a tow rope, I could replace it with a boom. Another idea is to shorten the tow. Right now you can see it's shortened by wrapping it around the horizontal boom as I'm still getting all the dimensions figured out.
ultimate goal is to string several barges together and tow those so it really looks industrial. I also need to fix all my leaky barges or make some out of steel