The 1966 X-A4 Aircoupe was a prototypical four seat development of the A2.
One was built, N6399X, first flying on 25 February 1966. Priced at $11,000, it did not enter production.
Engine: 150hp Lycoming O-320A
Wingspan: 30’0″
Length: 20’9″
Useful load: 1107 lb
Max speed: 150 mph
Cruise: 140 mph
Stall: 52 mph
Range: 755 mi
Seats: 4
All Aero 