RE: Bob Cat Copy Falcon 120 Jet
If you don't have a slight nose up attitude the plane will tend to leap off the pavement. When building one of these make sure that your retract location and strut length are such that the center of the wing leading edge sits slightly higher off the ground than the center of the wing trailing edge. If you put in too much nose up attitude it will tend to bounce on landing.
My wing is about 3/4" higher in front with the model sitting on the ground. This gives a nice smooth take off. There are a couple others in my club that sit slightly lower in the front and they leap off the runway. If your model is already built you could put a spacer under the nose retract, or the easy fix is to use take off flaps as Joe L. suggests.
Joe