Road Runner with stock wing and a 30cc something on front is a great big teddy bear type plane. Clip off a wing bay one each end, remove almost all the dihedral, reduce the incidence in the wing add a 40cc something and you have a real high performance sport flier. With the wing mods and a good 30cc its agood sport flier.
The Road Runner really excells as your first giant, and much later as your knock about plane