By the time the test program neared its conclusion, the aircraft had undergone major changes. One victim of the program was the shorter "A" wing, which calculations showed would only improve performance at speeds very close to Vmax (the highest available speed). Flight testing also showed the stall speed with the smaller wing was decidedly high. Split flaps and spoilers had also disappeared. The canopy and cockpit dimensions had changed, the aircraft had new landing gear systems, and the tail was completely new. Estimated top speed was also reduced 10%.