The 2-56 are not enough. i had about 20 flights on the and could not figure out why i was falling out or loops, and why they would get flat at the bottom, as well as twiching up and down at level flight. Then I changes the elevator push rods to 4-40 with a hard wood dowel and glassed it. MUCH BETTER. The rudder replace with a 4-40. I am at about 50 flights and can't imagine life without this plane. If you ahve any questions let me know.