Looking at the specs of the GP Extra 330L they appear very close to a plane that is regarded as one of the best 3D planes on the market, that being the Composite ARF 2.6. The length, wing span, wing area, weight, etc., and the fuselage appears identical. Though they are not constructed the same, aerodynamically they seem very close. I do see a big difference with the Cardon and the Columbo Anderson in length, almost 10". Bottom line is why is the Great Planes always called "a nice sport plane but not good for 3D"? What is it about the GP that needs modified or can't it be done and I'm not seeing it.