Thanks eirderz. I see what you are saying. I have ran this thing off o ;Df ice edges into open water and haven't had any problems. I think it's because most of the weight is to the rear. Also, the chassis and skis act almost like a ballast, so it is surprisingly stable. That is also the problem. Because the skis and chassis are below the waterline, you can't really get it back onto the ice. One guy suggested coming up with a way to raise the skis and I think that is what I am going to work on next. I have some pretty hilarious video of me and my wife taking turns trying to get this back on the ice out of open water!
