I think he planned this plane specially for South Africa, the upper "T" has more surface, the wings seems to also have more surface. I hope to ask his soon as he kept all this very secret! As you might know, the next Wolrd Championship in south africa will be at 1200 meters, so more surface and a new YS CDI 185 (if I'm not wrong) is a great idea to compensate the loss of traction and support due to altitude.