I own the stick 40 plus (with ailerons) and have flown the stick 40 without ailerons. I didn't like the way the latter one flew at all. I added a servo powered tail wheel to improve ground handling. The engine is a Saito .56 which moves it right along. The 40 plus flies as well as any other trainer I've flown with the exception of outside loops. It just won't do them. I'm using quite a bit more throw on all control surfaces that what is recommended in the instructions.