Grumman American AA-1X (1978)[25] Beechcraft C-23X (1980) Piper PA28 RX modified (T-tail) (1981)[26] Cessna 172X (1983),[27] Verilite Sunbird, high-wing pusher (1986)[28] Questair Venture[29] Cessna 210 (1987), high wing aspect ratio,[30] Smith Trainer (1992)[31]