I'm considering adding a set of sponsons to my 18' Clipper MacSport (40" beam). I take my wife and kids on a pretty big river and I think sponsons would add a measure of safety with the little ones on board. They look goofy but they are supposed to add a lot of stability. I could also go to a higher HP outboard (currently 2.5) without worrying too much. I'm looking at the outrigger types.