The FL-23 prototype was designed and built as a private venture, it was a high-wing cantilever monoplane with an all-moving tailplane mounted at the top of the fin. It had a fixed tricycle landing gear and powered a 225-hp (168 kW) Continental E225 piston engine. It had room for a pilot and observer in tandem; the observer had an unusual acrylic plastic enclosure to give an all-round visibility.

The US Army issued the specification for a two-seat liaison and observation monoplane and the prototype was entered into the competition. During trials the aircraft was badly damaged in a flying accident when it lost its tail, and was withdrawn from the competition. The competition was won by the Cessna 305A which became the L-19 Bird Dog.

Data from Jane's All The World's Aircraft 1951–52^[1]

General characteristics

• Crew: 2
• Length: 28 ft 4 in (8.64 m)
• Wingspan: 33 ft 4 in (10.16 m)
• Height: 8 ft 1 in (2.46 m)
• Wing area: 277 sq ft (25.7 m²)
• Airfoil: NACA 4412
• Empty weight: 1,500 lb (680 kg)
• Gross weight: 2,450 lb (1,111 kg)
• Fuel capacity: 60 US gal (50 imp gal; 230 L)
• Powerplant: 1 × Continental E225 air-cooled flat-six, 235 hp (175 kW)
• Propellers: Hartzell
• Propellers: 7 ft (2.1 m) diameter

Performance

• Maximum speed: 133 mph (214 km/h, 116 kn)
• Cruise speed: 118 mph (190 km/h, 103 kn)
• Stall speed: 38 mph (61 km/h, 33 kn) (flaps extended)
• Range: 485 mi (781 km, 421 nmi)
• Service ceiling: 19,500 ft (5,900 m)
• Rate of climb: 1,180 ft/min (6.0 m/s)

Aircraft of comparable role, configuration, and era

• O-1 Bird Dog

• Bridgman, Leonard (1951). Jane's All The World's Aircraft 1951–52. London: Sampson Low, Marston & Company, Ltd.