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08/14/2005. Remarks by Philo Lund: "Early 1922 US Army General W. Mitchell made a trip to Europe and visited Holland and the Fokker works. The prototype of the Fokker C.IV two-seat fighter-reconnaissance aircraft was shown to the general and he immediately bought the prototype and two developed series aircraft, they became the Corps Observation type XCO-4 (USAAS 68557) and CO-4 (USAAS 68565/68566). Before delivery of the three aircraft in 1922, the Netherlands Aircraft Manufacturing Company (Fokker’s sales organization in the US lead by R.B.C. Noorduyn) received an order for an additional five aircraft for delivery in 1923. These were designated CO-4A and received the USAAS s/ns 23-1205/1209. Differences were the lengthened fuselage, redesigned nose, the more powerful engine and side radiators and the lacking of the gas tank between the wheels.
SPECIFICATIONS

Model: Engine: Power: Span: Length: Heigth: Empty: Loaded: Speed:

XCO-4/CO-4 1 Lyberty 12A 420 hp 41 ft 6 in (12.65 m) 29 ft 8 in (9.04 m) 10 ft 10 in (3.30 m) 3.020 lb (1,370 kg) 4,494 lb (2,038 kg) 134 mph (216 kmh)

CO-4A 1 Lyberty 12A 435 hp 41 ft 6 in (12.65 m) 30 ft 4 in (9.25 m) 10 ft 10 in (3.30 m) 3.020 lb (1,370 kg) 4,525 lb (2,053 kg) 135 mph (217 kmh)

In 1924 the Netherlands Aircraft Manufacturing Company became Atlantic Aircraft Manufacturing Company, it was this (Fokker) company that modified one of the two CO-4’s (68565) into a AO-1 (Artillery Observation) as a private venture, after rejection by the USAAS it was modified to become a CO-4A. All aircraft were used for experimental flying, they remained in service until 1926. The following McCook Field Project Numbers were allocated: 68557 P-250, 68565 P-284, 68556 P-285 and later P-365, 23-1209 P-325."