I put some power in my alpha 40 and even with 4 rubberbands on each side i could swing it through some pretty hard maneuvers. Ive started to go with 10-12 rubber bands though now that im real comfortable with it and fly it like my sport plane lol. a box of rubber bands is 3 bucks if your uncomfortable add more. but trust me with 4 on each side you can grab it by the wings and shake it violently and they arnt coming off. and they only have to support the weight of the plane at 1 g maneuvers and even if you could put the plane through 3-4 g turns 8 rubber bands can support that 20 ish pound force.