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Northrop Alpha

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Title: Northrop Alpha  
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Collection: Northrop Aircraft, United States Airliners 1930–1939
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Northrop Alpha

Northrop Alpha - NASA Photo
Role Transport
Manufacturer Northrop
Designer John K. Northrop
First flight 1930
Introduction April 20, 1931
Retired 1975 to Smithsonian Institution
Primary users Trans World Airlines
US Army Air Corps
Number built 17[1]
Variants Northrop Gamma
C-19 Alpha

The Northrop Alpha was an American single-engine, all-metal, seven-seat, low-wing monoplane fast mail/passenger transport aircraft used in the 1930s. Design work was done at the Avion Corporation, which in 1929, became the Northrop Aircraft Corporation based in Burbank, California.[1]


  • Design & Development 1
  • Operational history 2
  • Variants 3
  • Operators 4
  • Specifications (Alpha 2) 5
  • See also 6
  • References 7
  • External links 8

Design & Development

Drawing on his experience with the Lockheed Vega, John K. Northrop designed an advanced mail/passenger transport aircraft. In addition to all-metal construction, the new Alpha benefitted from two revolutionary aerodynamic advancements: wing fillets researched at the Guggenheim Aeronautical Laboratory at the California Institute of Technology, and a multicellular stressed-skin wing of Northrop's own design which was later successfully used on Douglas DC-2 and Douglas DC-3. In addition, the Alpha was the first commercial aircraft to use rubber deicer boots on wing and empennage leading edges which, in conjunction with state-of-the-art radio navigation equipment, gave it day or night, all-weather capability. The aircraft first flew in 1930, with a total of 17 built.[2]

The Alpha was further developed into a dedicated fast transport Northrop Gamma.

Operational history

Alpha in TWA colors on display at the National Air and Space Museum
Under the Northrop Alpha

The Alpha entered service with Transcontinental & Western Air (future TWA) making its inaugural flight on April 20, 1931. The trip from San Francisco to New York required 13 stops and took just over 23 hours. TWA operated 14 aircraft until 1935, flying routes with stops in San Francisco, California; Winslow, Arizona; Albuquerque, New Mexico; Amarillo, Texas; Wichita, Kansas; Kansas City, Missouri; St. Louis, Missouri; Terre Haute, Indiana; Indianapolis, Indiana; Columbus, Ohio; Pittsburgh, Pennsylvania; Philadelphia, Pennsylvania; and New York. Three Alphas were operated by the US military as C-19 VIP transports until 1939.[2]

TWA's were initially operated as a passenger service but the Alpha's were later modified at the Stearman factory in Wichita into the cargo-carrying 4A model with a new type certificate. Stearman and Northrop had the same parent company at the time.

The third Alpha built, NC11Y, was reacquired by TWA in 1975, and is preserved at the Smithsonian National Air and Space Museum.[1]


Alpha 2
six-passenger version
Alpha 3
two-passenger plus cargo version, several Alpha 2s were converted to this configuration
Alpha 4
cargo version with 2 ft (0.6 m) increased wingspan and large metal fairings encapsulating the main gear for drag reduction. All were converted from Alpha 3s
Alpha 4A
cargo version, all converted from Alpha 4s
YC-19 & Y1C-19
military VIP transport, seating reduced to four passengers, serial numbers 31-516 to 31-518,[3] YC-19 had a Pratt & Whitney R-1340-7, while the Y1C-19s had the R-1340-11 engine[4]


 United States
USAAC Northrop Alpha

Specifications (Alpha 2)

General characteristics

  • Crew: one
  • Capacity: six passengers
  • Length: 28 ft 5 in (8.7 m)
  • Wingspan: 41 ft 10 in (12.8 m)
  • Height: 9 ft 0 in (2.7 m)
  • Wing area: 295 ft² (27.4 m²)
  • Empty weight: 2,590 lb (1,177 kg)
  • Loaded weight: 4,500 lb (2,045 kg)
  • Useful load: 1,910 lb (868 kg)
  • Max. takeoff weight: lb (kg)
  • Powerplant: 1 × Pratt & Whitney Wasp R-1340-SC1, 420 hp (313 kW)


See also

Related development
Aircraft of comparable role, configuration and era


  1. ^ a b c Eden and Moeng 2002, pp. 74–77.
  2. ^ a b Smith 1986
  3. ^ Swanborough and Bowers 1964, p. 596.
  4. ^ Fahey 1946, p. 24.
  • Eden, Paul and Soph Moeng. The Complete Encyclopedia of World Aircraft. London: Amber Books Ltd., 2002. ISBN 0-7607-3432-1.
  • Fahey, James C. U.S. Army Aircraft 1908-1946 (Heavier-Than-Air) . New York: Ships and Aircraft, 1946.
  • Smith, M.J. Jr. Passenger Airliners of the United States, 1926-1991. Missoula, Montana: Pictorial Histories Publishing Company, 1986. ISBN 0-933126-72-7.
  • Swanborough, F. Gordon and Peter M. Bowers. United States Military Aircraft Since 1909. New York: Putnam, 1964. ISBN 0-85177-816-X.

External links

  • , July 1930, p. 7 bottomPopular Mechanics Monthly"Low-Wing Metal Monoplane Develops High Speed,"
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