If a Airtronics 102 or Futaba 3003 can fly a 72" aerobatic plane (easy flying) then what do you think of it on a small 40 sized 3D plane? I have used the 'basic' servos on 3D planes, no issues BUT if you fly them really hard, best to go with karbonite/MG ones. Its much safer as the gear might not only break, it can at times skip a tooth, happened to one of my pals on his CG Matrix.