Naval Aircraft Factory NO


Naval submarine plane, 7-27-23 LOC npcc.09161 (cropped).jpg
Martin M2O-1 leading a Martin MS-1 in July 1923
Role Naval observation floatplane
National origin United States
Manufacturer Naval Aircraft Factory, Martin
Designer Bureau of Aeronautics
First flight 1923
Retired 1927
Primary user United States Navy
Number built 6

Naval Aircraft Factory NO was an American short-range reconnaissance/gun spotting aircraft of the 1920s. A single-engined three-seat biplane with alternative floats or wheels, six were built for the U.S. Navy.

Development and design

The NO was designed at the U.S. Navy Bureau of Aeronautics (BuAer) as a single-engined single-bay sesquiplane capable of being fitted with either a conventional tailwheel undercarriage or two floats. It was fitted with a 435 hp (324 kW) Curtiss D-12 water-cooled V-12 engine, with a radiator installed between the floats or wheels, depending on such configuration.[1]

The design featured the use of W-type (aka Warren truss) and N-type wing bracing struts, that offered both compression and tension resistance to static and dynamic loads, instead of the traditional tension wires employed on many biplanes of the period. This structural principle had been incorporated successfully in the design of the Naval Aircraft Factory TS fighter, as designed by Rex Beisel when employed at BuAer, and later also used on the Martin MS submarine-based biplane that required rapid assembly and rigging.[1]

The three crew occupied separate open cockpit stations, and the rearmost cockpit was equipped with a swivel-mounted machine gun for defense.[1] Small differences observed between the Martin and NAF versions included exhaust stacks, fin and rudder shapes, and presence or omission of a propeller spinner.[2]

Operational history

In 1923, pre-production construction contracts were issued to both the Naval Aircraft Factory (NAF) and Glenn L. Martin Company (as Martin Model 60), each for three aircraft, designated Naval Aircraft Factory NO and Martin M2O respectively. Deliveries of the Martin M2O-1 started in 1923, and all six aircraft were completed by the end of 1924. The NAF-built aircraft were assigned serial numbers A-6431 to A-6433 (initially designated as NO-1), and A-6452 to A-6454 were assigned to the Martin M2O-1 aircraft. Subsequently, the third NO-1 (serial number A-6433) was converted with a 440 hp Packard 1A-1500 and redesignated as NO-2. Photos have shown that at least two Martin M2O-1 (A-6452 and A-6454), were configured with wheeled undercarriage during their service.[1][3][4]

The type proved to be no better than the Vought UO in the gun spotting role,[5] and was never placed into quantity production. All six were withdrawn from use by the end of 1927.[1]


Three-seat twin-float floatplane powered by a 435 hp (324 kW) Curtiss D-12 water-cooled V-12 engine. Three built by the Naval Aircraft Factory.[2][1]
The third, and last, NO-1 was modified with a 425hp (317 kW) Packard 1A-1500 water-cooled V-12 engine, and redesignated NO-2.[2][1]
Designation of Martin-built NO-1, three built.[2][1]


Data from United States Navy Aircraft since 1911 [2]

General characteristics

  • Crew: 3
  • Length: 31 ft 10 in (9.7 m)
  • Wingspan: 43 ft 6 in (13.29 m)
  • Gross weight: 4,173 lb (1,893 kg)
  • Powerplant: 1 × Curtiss D-12 , 435 hp (324 kW)
  • Propellers: 2-bladed


  • Maximum speed: 104 mph (167 km/h, 90 kn)


See also



  1. ^ a b c d e f g h Johnson 2011, p. 112
  2. ^ a b c d e Swanborough 1990, p. 515
  3. ^ Andrade 1979, p. 204
  4. ^ Aerofiles NAF
  5. ^ Breihan 1995


  • Aerofiles. "Aerofiles_NAF". Retrieved 5 January 2022.
  • Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.
  • Breihan, John R.; Piet, Stan; Mason, Roger S. (1995). Martin Aircraft, 1909-1960. Narkiewicz/Thompson. ISBN 978-0913322031.
  • Johnson, E.R. (2011). United States Naval Aviation 1919-1941: Aircraft, Airships and Ships Between the Wars. McFarland and Company. p. 112. ISBN 978-0-7864-4550-9.
  • Swanborough, Gordon; Bowers, Peter M (1990). United States Navy Aircraft since 1911. Putnam Aeronautical. p. 515. ISBN 0-85177-838-0.