well for knife edge and stuff like that, ill use the extra i have now, i just wanna practice on this so i get comfortable before trying it on the Extra 300. So i can be okay with the .40 la?? Or should i get the .46 FX. If im getting a new engine, the .46 FX is definately my choice. Im kind of going against myself again but what about the FuntanaS?? Thats more expensive though (the airplane not really, but itll need an expensive engine.)