I built an Aerobipe back in the late '70s (I think) with a Veco (K&B) 19 RCand a World Engines Expertradio with the "Full Size" servos, titet fit! I found the lower wing needed to have a 1/16" dihedral brace out 2 bays fromcenteror it folded whenever a wingtip touched ground. Also with the weight or the 19 and the old time radio (and the excessive power of the 19) the rudder was way too sensative. Eventually I made a control horn that was about1.5 inches long (no dual rates, adjustable endpoints or Expo back then). Flew it a lot but it was trickey. Probably converted to electric or flown with a .10 and a small light radio it would be a ball to fly and probably a lot better behaved than mine was. D.H.