I run 17x4W.. some people like the 16x6 .. its all in personal preference..you will get a pound more thrust with the 16x6 but your airspeed will go up at full throttle,that is why my choice is 17x4W. as for the tank. i would use a dubro. or better yet a seamless tank.. i have had H9 tanks to rupture from the pressure the YS produce...