I had my UH-1B's blowing up on the runway too. The UH-1H was not. Found the difference in the DATA.ini in the skids section (ie landing gear), the shock travel on the UH-1H was 0.5 and on the UH-1B it was 5. After changing that to 0.5 the UH-1B's just bouce a bit then settle down but dont blow up on a runway start.