Morris line Knife, Su do khoi, Sledge. Awesome planes, I have a knife with a YS.63 in it 5.5 lbs and its a rocket with a 13x4W prop 20% fuel. Another guy at my field has the Flip 3D although I dont agree with his choice of mini servos in it but he did manage to get the weight down to 4.25 lbs. Thas pretty damn light. But he has had his issues already with the servos as you can imagine.