Tony makes the planes look like yo yo's. What the videos do is implant in your mind that it can be done, yes and it isn't that difficult with practice. Tony used regular planes with regular engines. The Knife in my opinion is the best all around hoverbatic plane. It hovers all day long, will harrier and flat spin with the best of them. It isn't the best tumbler. A very forgiving floater type hover trainer that's also a blast to fly. Have fun and take care_Bob