The smaller airplanes are just a pain on floats, they get blown around easier, affected by the chop more and if you don't have a muffler they are loud. The best pane for the small engines are floaters, trainer, old timers and the such tthat you can cheat and have a bigger air frame for the smaller motor. A Quaker Flash would be a good choice if you want a floater. The problem is not everyone wants a floater and when you get a smaller, nimbler airframe for a 1/2 A motor it's difficult to get in the air, not as much fun to fly, and usually noisy. Most people want a .40 size or bigger so that's were the majority of the designs are. That doen't mean you can't shrink down a good exsisting design or design your own airplane.....