Here's your answer: wings are too tiny. The full-scale version had a fairly high wing loading with high control stick pressures...........it was said to feel not unlike a jet. High wing loadings don't fair too well in the modeling world and it's the kiss of death for a racer. I'm familiar with the one mentioned and it flew pretty well (but it was designed, built and flown by a VERY skilled modeler). It was fast but it wasn't the quickest ship around the turns. Sure looked cool, though!