A Cub like the Great Planes Fabric Covered Cub 82" with floats maybe...A 1/4 Cub would be a little too big and the 1/5 is almost too small but add floats and it might be a nice combo if you are into that...I have an OS Max .81 FS on my GP Cub and I love it...I find it fits real well both on wheels and floats .. I think an 91 would fit well too...