Martin 146

The Martin Model 146 was an unsuccessful American bomber design that lost a 1934–1935 bomber design competition to the prototype for the Douglas B-18 Bolo (itself soon supplanted by the B-17 Flying Fortress).

Model 146
Martin Model 146
Martin Model 146 during competition c. 1935, USAF photo
Role Heavy bomber
Manufacturer Glenn L. Martin Company
First flight 1935
Status Experimental prototype
Primary user United States Army Air Corps (intended)
Produced 1935
Number built 1
Developed from Martin B-10

Design and development

Although generally satisfied with the speed and bombload of the Martin B-10, the United States Army Air Corps expressed a requirement for a bomber with long range. Two competitions were held in 1934-35: one for fast bombers capable of flying 2,200 miles (3,500 km), and a second for the experimental prototype of a 5,000-mile (8,000 km) bomber.

The Martin 146 was built for the first competition, competing with the Boeing Model 299 (later the B-17) and Douglas DB-1 (later the B-18). Two versions were submitted for the competition, the Model 146 (actual aircraft) and the Model 146A (design only). The only significance between the two was the planform, the 146 center section was rectangular with the outer wing being tapered while the 146A had a constant taper.

The Model 146 bore a striking resemblance to the earlier Martin B-10, with the same configurations of turret and cockpits and even the same two Wright R-1820 Cyclone engines – albeit with 50% more power than the 600 hp Cyclones of the original B-10. The biggest differences between this aircraft and the Martin 139 (B-10) was that it was wider, allowing the pilot and co-pilot to sit side by side [1] and was equipped with Fowler flaps, the first large aircraft equipped with them.

The Model 146 was not successful but it led the Martin company to begin research into contemporary aviation technology. Some offshoots included the innovative Martin 145 proposed for the long-range bomber competition as well as the early studies that would lead to the Model 179 (later to emerge as the wartime Martin B-26). The aircraft was eventually returned to the factory and scrapped.

Specifications (Model 146)

General characteristics

  • Crew: four
  • Length: 52 ft 0 in (15.5 m)
  • Wingspan: 75 ft 1 in (22.9 m)
  • Height: 15 ft 5 in (4.7 m)
  • Wing area: 729 ft2 (67.7 m2)
  • Loaded weight: 16,000 lb (7,257 kg)
  • Max. takeoff weight: 17,100 lb (7,756 kg)
  • Powerplant: 2 × Wright R-1820-G5 Cyclones "Cyclone" radials, 800 hp (597 kW) each



See also

Related development

Aircraft of comparable role, configuration and era

Related lists


  1. ^ "Model 146." Archived 2007-08-26 at the Wayback Machine Retrieved: 5 December 2o12.
  2. ^ Martin 146 Specifications.' Archived 2012-02-25 at the Wayback Machine Retrieved: 5 December 2012.
  • Baugher, Joe. "Martin B-10". Encyclopedia of American Aircraft. Retrieved: 4 July 2007.
  • Taylor, John W. R. "Martin B-10". Combat Aircraft of the World from 1909 to the Present. New York: G.P. Putnam's Sons, 1969. ISBN 0-425-03633-2.

External links

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Flap (aeronautics)

Flaps are a kind of high-lift device used to increase the lift of an aircraft wing at a given airspeed. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used for extra lift on takeoff. Flaps also cause an increase in drag in mid-flight, so they are retracted when not needed.

Extending the wing flaps increases the camber or curvature of the wing, raising the maximum lift coefficient or the upper limit to the lift a wing can generate. This allows the aircraft to generate the required lift at a lower speed, reducing the stalling speed of the aircraft, and therefore also the minimum speed at which the aircraft will safely maintain flight. The increase in camber also increases the wing drag, which can be beneficial during approach and landing, because it slows the aircraft. In some aircraft configurations, a useful side effect of flap deployment is a decrease in aircraft pitch angle, which lowers the nose thereby improving the pilot's view of the runway over the nose of the aircraft during landing. In other configurations, however, depending on the type of flap and the location of the wing, flaps can cause the nose to rise (pitch-up), obscuring the pilot's view of the runway.

There are many different designs of flaps used, with the specific choice depending on the size, speed and complexity of the aircraft on which they are to be used, as well as the era in which the aircraft was designed. Plain flaps, slotted flaps, and Fowler flaps are the most common. Krueger flaps are positioned on the leading edge of the wings and are used on many jet airliners.

The Fowler, Fairey-Youngman and Gouge types of flap increase the wing area in addition to changing the camber. The larger lifting surface reduces wing loading, hence further reducing the stalling speed.

Some flaps are fitted elsewhere. Leading-edge flaps form the wing leading edge and when deployed they rotate down to increase the wing camber. The de Havilland DH.88 Comet racer had flaps running beneath the fuselage and forward of the wing trailing edge. Many of the Waco Custom Cabin series biplanes have the flaps at mid-chord on the underside of the top wing.

Glenn L. Martin Company

The Glenn L. Martin Company was an American aircraft and aerospace manufacturing company founded by aviation pioneer Glenn L. Martin. The Martin Company produced many important aircraft for the defense of the US and allies, especially during World War II and the Cold War. During the 1950s and 60s, the Martin Company moved from the aircraft industry into the guided missile, space exploration, and space utilization industries.

In 1961, the Martin Company merged with American-Marietta Corporation, a large sand and gravel mining company, forming Martin Marietta Corporation. In 1995, Martin Marietta merged with aerospace giant Lockheed to form the Lockheed Martin Corporation.

List of aircraft (Ma)

This is a list of aircraft in numerical order of manufacturer followed by alphabetical order beginning with 'M'.

Martin and Martin Marietta aircraft
Model numbers
Attack aircraft
Maritime patrol
Military transports
Military trainers
Scout/Torpedo bombers
Reconnaissance aircraft
Martin Marietta


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