The 1920 C4 model (ATC 300) was powered by a 240hp Wright J-6 engine. Selling for $9,750, five were built, the first model, NC750N, had a smaller rudder.
Five of the 1930 C4-225 (ATC 310) were built (NC750N to NC752N, and NC10482 to NC10483), selling for $11,700. They were powered with a 225hp Wright J-6 engine.
Three of the 1930 C4-300 and C4-301 / E4-301 (ATC 394) were built (NC981N, NC988N, and NC10593), powered with a 300hp P&W Wasp Jr and selling for $11,900.
C4
Engine: 240hp Wright J-6
Wingspan: 50’0″
Length: 32’3″
Useful load: 1190 lb
Max speed: 130 mph
Cruise: 110 mph
Stall: 50 mph
Range: 700 mi
Seats: 4
C4-225
Engine: 225hp Wright J-6
Length: 32’7″
Useful load: 1398 lb
Max speed: 143 mph
Cruise: 121 mph
Stall: 56 mph
Range: 600 mi
C4-300 / C4-301 / E4-301
Engine: 300hp P&W Wasp Jr
Useful load: 1448 lb
Max speed: 145 mph
Cruise: 128 mph
Stall: 57 mph
Range: 610 mi
All Aero 