TheCurtiss Model 55 Kingbird was an airliner built in small numbers in the United States in the early 1930s. It was a twin-engine aircraft with a fuselage derived from the single-engineCurtiss Thrush. The Kingbird had two engine nacelles mounted on the struts on either side of the fuselage that braced the wing and the outrigger undercarriage. A distinctive design feature was the aircraft's blunt nose, located behind the propeller arcs. This allowed the engines to be mounted closer to each other and to the aircraft's centerline, therefore minimising asymmetrical thrust in case of an engine failure. For the same reason, the Thrush's single tailfin was replaced by twin tails on the Kingbird, and the main production model, theD-2 fitted a second horizontal stabilizer and elevator between these fins.

Model 55 Kingbird
The Curtiss RC-1
Role	Airliner
Manufacturer	Curtiss-Wright
Designer	Theodore Paul Wright,Al Wedburg
First flight	1929
Primary users	Eastern Air Transport United States Marine Corps
Number built	19
Developed from	Curtiss Thrush

Eastern Air Transport was to be the Kingbird's main operator, flying 14 of them for a few years. The United States Marine Corps also purchased an example, first designating itJC-1, thenRC-1 and using it as an air ambulance.

Kingbird C

Prototype powered by 185 hp (138 kW) six-cylinderCurtiss R-600 Challenger engines. One built, but found to be underpowered. Later converted to Kingbird J-1.^[1]

Kingbird D-1

Second and third prototypes (previously Kingbird J-3 and J-2) powered by 225 hp nine-cylinderWright Whirlwind J-6-7radial engines. Later converted to D-2 standard.^[2]

Kingbird D-2

Production aircraft with two 300 hp (224 kW) Whirlwind J-6-9 engines. 14 built plus two converted from D-1s.^[1]

Kingbird D-3

One-off Curtiss executive transport. Two 330 hp (246 kW) Whirlwind J-6-9 engines. Seats for five passengers.^[3]

Kingbird J-1

First prototype after re-engining with Whirlwind engines.^[3]

Kingbird J-2

Third prototype, J-6-7 engines.^[3]

Kingbird J-3

Second prototype, J-6-9 engines.^[3]

RC-1

Single Kingbird D-2 for US Navy, originally ordered asJC-1 (J for utility), but delivered asRC-1 (R for transport).^[4]

  United States

• Eastern Air Transport
• United States Marine Corps

  Turkey

• Turkish Airlines (under former official name: State Airlines Administration)

Data fromCurtiss Aircraft, 1907–1947^[4]

General characteristics

• Crew: 1
• Capacity: 7 pax
• Length: 34 ft 5.125 in (10.49338 m)
• Wingspan: 54 ft 6 in (16.61 m)
• Height: 10 ft 0 in (3.05 m)
• Wing area: 405 sq ft (37.6 m²)
• Airfoil: Curtiss C-72^[5]
• Empty weight: 3,877 lb (1,759 kg)
• Gross weight: 6,115 lb (2,774 kg)
• Powerplant: 2 ×Wright J-6-9 Whirlwind 9-cylinder air-cooled radial piston engine, 300 hp (220 kW) each

Performance

• Maximum speed: 142 mph (229 km/h, 123 kn)
• Cruise speed: 112 mph (180 km/h, 97 kn)
• Range: 415 mi (668 km, 361 nmi)
• Service ceiling: 16,000 ft (4,900 m)
• Rate of climb: 1,000 ft/min (5.1 m/s)

Related lists

• List of United States Navy aircraft designations (pre-1962)

• Bowers, Peter M. (1979).Curtiss Aircraft, 1907–1947. London: Putnam & Company Ltd.ISBN 0-370-10029-8.
• Taylor, Michael J. H. (1989).Jane's Encyclopedia of Aviation. London: Studio Editions. p. 288.

• "The Curtiss "Kingbird": An American Twin-Engined Cabin Transport".Flight.XXIII (2):29–30. January 9, 1931. RetrievedOctober 13, 2012. A contemporary technical article on the Kingbird, with details of the version with 225 hp Whirlwind J-6-7 engines.
• aerofiles.com
• generalaviationnews.com