The wing tips were angled downward 35° to reduce the lateral stability, the wing was redesigned to detach from the fuselage, and the aerodynamic balancing of the elevators was reduced from 24% to 20%. The fuel capacity was increased to , the cockpit was widened by  and fitted with an ejection seat.
The wing tips were angled downward 35 degrees to decrease lateral stability, the wing was redesigned to detach from the fuselage, and the elevator's aerodynamic balance was reduced from 24% to 20%. The fuel capacity was increased by , the cockpit was widened by  and fitted with an ejection seat.