The small planes. I have a Gravity hobbies Spitfire(used to be Cox) that weighs 4.2 oz even though it probably lands at 5 mph that is really fast for such a tiny plane. A wind gust will toss the plane around like newspaper. Inverted flight on a flat bottom wing with a lot of dihedral can be a challenge. But if you can do some things on a trainer you can do them on anything.-BW