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° to reduce 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.