I'm still not sure whether to get a RTF kit for the Avistar or an ARF kit and get the engine and radio separate (i WILL get the ARF if I can afford it), but i want to know what prop size is good for the Avistar with a .46 engine. Tower hobbies says that a 10x6 is too small. ALSO while I'm putting up yet another post, what tools will i need if i decide to get the ARF avistar? How much more will i need to do compared to assembling the RTF avistar kit? I know this issue has been beaten into the dirt, but what props are better more for trainers? I just stumbled across the issue of prop balancing and lord, you can't find a straight anwer for that one!! Maybe i should just spend the extra 20 and get a prop balancer as well!!