Northrop N-1M

Last updated
N-1M
Northrop N1M.jpg
Northrop N-1M on display at the National Air and Space Museum's Steven F. Udvar-Hazy Center. Restored to its final flight configuration.
General information
Type Flying wing
National originUnited States
Manufacturer Northrop Corporation
Designer
StatusExperimental
Number built1
History
First flight3 July 1940
Retired 1945
Developed from Northrop N-1
Variants Northrop N-9M

The Northrop N-1M (Northrop Model 1 Mockup), [1] also known by the nickname "Jeep", [1] is a retired American experimental aircraft used in the development of the flying wing concept by Northrop Aircraft during the 1940s.

Contents

Design and development

Northrop 1929 flying wing (X-216 H). Photo from Aero Digest March, 1930 Northrop 1929 flying wing Aero Digest March,1930.jpg
Northrop 1929 flying wing (X-216 H). Photo from Aero Digest March, 1930

Jack Northrop became involved with all-wing aircraft designs in the late 1920s, with his first flying wing research prototype being built in the 1928–1930 time period. That first prototype, registered X-216H, had evolved from earlier design studies but was not yet a true flying wing as it retained a tail unit comprising twin rudders with a single horizontal stabilizer running between them; both rudders were connected by twin booms to the thick, all-wing blended fuselage. The aircraft had an open cockpit in the center wing section and single, rear-facing, pusher propeller connected to a Menasco Cirrus inverted-four piston engine blended into the all-wing shape. [2] X-216H was first flown in 1929 with Edward Bellande at the controls; [3] the aircraft displayed adequate performance and was noted for its unique all-metal stressed skin and multi-cellular construction. At about this same time, Jack Northrop became aware of Walter and Reimar Horten's record-setting "tailless" flying wing glider designs being tested in Germany beginning in 1934. [4]

The N-1M was one of a progression of experimental aircraft that further developed Northrop's all-wing concept. The aircraft was produced in the United States and was developed during 1939 and 1940 as a flying testbed for the purpose of proving Jack Northrop's vision of a practical Flying Wing. Built mostly of specially laminated layers of glued wood, the design of both wooden wings allowed for easy configuration changes with the central blended fuselage, which was made of tubular steel. The aircraft first flew on 3 July 1941 at Baker Dry Lake in California. [5] [N 1]

Operational history

Northrop's Chief Test Pilot Vance Breese flew the N-1M on its maiden flight, unexpectedly bouncing into the air during a planned high-speed taxi run. He reported that the aircraft could fly no higher than five feet. Flight could only be sustained by maintaining a precise angle of attack, but Theodore von Kármán solved the problem by making adjustments to the trailing edges of the elevons. Control of the aircraft was achieved through the use of a system of elevons and wingtip rudders. The elevons served in tailless type aircraft both as elevators and ailerons, while split flaps on the downward angled wingtips took the place of a conventional rudder; they were later straightened after that angle proved unnecessary during flight testing. [6]

The flight test program continued with Moye W. Stephens, Northrop Test Pilot and Secretary to the Northrop Corporation, serving as a test pilot. Early tests showed the N-1M to be satisfactory in stability and control, but overweight and underpowered. The aircraft's two 65-horsepower (48 kW) Lycoming O-145 four-cylinder engines (buried in the wing to reduce drag) were replaced by two 120-horsepower (89 kW) six-cylinder 6AC264F2 air-cooled Franklin engines. By November 1941, after 28 flights, Stephens reported that when attempting to move the N-1M about its vertical axis, the aircraft had a tendency to "Dutch roll." The oscillations proved to be manageable when adjustments were made to the aircraft's wing configuration. [6]

The N-1M proved to be basically sound, paving the way for Northrop's later and much larger Northrop YB-35 and YB-49 aircraft. The aircraft was donated to the United States Army Air Forces in 1945 and was placed in the storage collection of the National Air Museum the following year. It sat there for nearly three decades, but was brought back to static, non-flying status, in its final flight configuration, after several years of restoration during the 1980s. The N-1M is now on public display at the National Air and Space Museum's Steven F. Udvar-Hazy Center. [6]

Specifications (N-1M)

Data from American X&Y Planes [6]

General characteristics

Performance

See also

Related development

Related Research Articles

<span class="mw-page-title-main">Flying wing</span> Tailless fixed-wing aircraft that has no definite fuselage

A flying wing is a tailless fixed-wing aircraft that has no definite fuselage, with its crew, payload, fuel, and equipment housed inside the main wing structure. A flying wing may have various small protuberances such as pods, nacelles, blisters, booms, or vertical stabilizers.

<span class="mw-page-title-main">Northrop YB-35</span> American flying-wing bomber prototype

The Northrop YB-35/XB-35, Northrop designation N-9 or NS-9, were experimental heavy bomber aircraft developed by the Northrop Corporation for the United States Army Air Forces during and shortly after World War II. The airplane used the radical and potentially very efficient flying wing design, in which the tail section and fuselage are eliminated and all payload is carried in a thick wing. Only prototypes and pre-production aircraft were built, although interest remained strong enough to warrant further development of the design as a jet bomber, under the designation YB-49.

<span class="mw-page-title-main">Northrop YB-49</span> American flying-wing bomber prototype

The Northrop YB-49 was an American prototype jet-powered heavy bomber developed by Northrop Corporation shortly after World War II for service with the United States Air Force. The YB-49 featured a flying wing design and was a turbojet-powered development of the earlier, piston-engined Northrop XB-35 and YB-35. The two YB-49s built were both converted YB-35 test aircraft.

<span class="mw-page-title-main">Northrop X-4 Bantam</span> American experimental jet aircraft

The Northrop X-4 Bantam was a prototype small twinjet aircraft manufactured by Northrop Corporation in 1948. It had no horizontal tail surfaces, depending instead on combined elevator and aileron control surfaces for control in pitch and roll attitudes, almost exactly in the manner of the similar-format, rocket-powered Messerschmitt Me 163 of Nazi Germany's Luftwaffe. Some aerodynamicists had proposed that eliminating the horizontal tail would also do away with stability problems at fast speeds resulting from the interaction of supersonic shock waves from the wings and the horizontal stabilizers. The idea had merit, but the flight control systems of that time prevented the X-4 from achieving any success.

<span class="mw-page-title-main">Jack Northrop</span> Aircraft industrialist and designer, founder of Northrop Corporation

John Knudsen Northrop was an American aircraft industrialist and designer who founded the Northrop Corporation in 1939.

<span class="mw-page-title-main">Northrop N-9M</span>

The Northrop N-9M was an approximately one-third scale, 60-foot (18 m) span all-wing aircraft used for the development of the full size, 172-foot (52 m) wingspan Northrop XB-35 and YB-35 flying wing long-range, heavy bomber. First flown in 1942, the N-9M was the third in a lineage of all-wing Northrop aircraft designs that began in 1929 when Jack Northrop succeeded in early experiments with his single pusher propeller, twin-tailed, twin-boom, all stressed metal skin Northrop X-216H monoplane, and a decade later, the dual-propeller N-1M of 1939–1941. Northrop's pioneering all-wing aircraft would lead Northrop Grumman many years later to eventually develop the advanced B-2 Spirit stealth bomber, which debuted in 1989 in US Air Force inventory.

<span class="mw-page-title-main">Empennage</span> Tail section of an aircraft containing stabilizers

The empennage, also known as the tail or tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow. The term derives from the French language verb empenner which means "to feather an arrow". Most aircraft feature an empennage incorporating vertical and horizontal stabilising surfaces which stabilise the flight dynamics of yaw and pitch, as well as housing control surfaces.

<span class="mw-page-title-main">Northrop XP-79</span> Prototype flying wing fighter aircraft

The Northrop XP-79, USAAF project number MX-365, was a rocket and jet-powered flying wing fighter aircraft, designed by Northrop. The pilot operated the aircraft in a prone position, permitting him to withstand much greater g-forces in pitch. It also used a welded magnesium monocoque structure instead of riveted aluminum.

<span class="mw-page-title-main">Northrop XP-56 Black Bullet</span> Experimental fighter intercepter aircraft by Northrop

The Northrop XP-56 Black Bullet was a unique prototype fighter interceptor built by the Northrop Corporation. It was one of the most radical of the experimental aircraft built during World War II. Ultimately, it was unsuccessful and did not enter production.

<span class="mw-page-title-main">Armstrong Whitworth A.W.52</span> Type of aircraft

The Armstrong Whitworth A.W.52 was an early flying wing aircraft designed and produced by British aircraft manufacturer Armstrong Whitworth Aircraft.

<span class="mw-page-title-main">Boulton Paul P.120</span> British research aircraft

The Boulton Paul P.120 was a research aircraft designed and produced by the British aircraft manufacturer Boulton Paul. It was the last aircraft design by the company to be flown.

<span class="mw-page-title-main">Short SB.4 Sherpa</span> Type of aircraft

The Short SB.4 Sherpa was an experimental aircraft designed and produced by the British aircraft manufacturer Short Brothers. Only a single example was ever produced.

<span class="mw-page-title-main">Westland-Hill Pterodactyl</span>

Pterodactyl was the name given to a series of experimental tailless aircraft designs developed by G. T. R. Hill in the 1920s and early 1930s. Named after the genus Pterodactylus, a well-known type of pterosaur commonly known as the pterodactyl, all but the first were produced by Westland Aircraft Ltd after Hill joined them.

<span class="mw-page-title-main">General Aircraft GAL.56</span> Type of aircraft

The General Aircraft GAL.56 was a family of 1940s British experimental tailless swept wing glider designs.

<span class="mw-page-title-main">Tailless aircraft</span> Aircraft whose only horizontal aerodynamic surface is its main wing

In aeronautics, a tailless aircraft is an aircraft with no other horizontal aerodynamic surface besides its main wing. It may still have a fuselage, vertical tail fin, and/or vertical rudder.

<span class="mw-page-title-main">Dunne D.7</span> Type of aircraft

The Dunne D.7 was one of J. W. Dunne's swept wing tailless aircraft designed to have automatic stability, first flying in 1911. It was a single seat, single engined pusher monoplane developed from the unsuccessful D.6.

The NRC tailless glider, also called the NRL tailless glider, was a two-seat tailless research glider designed by the National Research Council of Canada and built by the National Research Laboratories, at the instigation of G.T.R. Hill who had previously designed the British Westland-Hill Pterodactyl series of tailless aircraft.

<span class="mw-page-title-main">Nieuport-Delage NiD 940</span> Type of aircraft

The Nieuport-Delage NiD 940 was a French, tailless, pusher configuration touring aircraft first flown in 1934. It suffered from longitudinal instabilities and despite modifications and a more powerful engine, it did not receive its Certificate of Airworthiness.

<span class="mw-page-title-main">Northrop N-1</span> American flying wing bomber project

The Northrop N-1 was a projected flying wing medium bomber designed by Jack Northrop.

References

Notes

  1. Heavily illustrated, authoritative N-1M article.

Citations

  1. 1 2 3 "Northrop N1M". National Air and Space Museum. Smithsonian Institution. Archived from the original on 2017-01-02. Retrieved 2017-11-27.
  2. Plletier, Alain J. "Towards the Ideal Aircraft?" Air Enthusiast, No. 17, July/August 1996. pp.15,17.
  3. Maloney 1988, p. 1.
  4. Coleman 1988, p. 84.
  5. O'Leary 2007
  6. 1 2 3 4 Darling 2009 [ page needed ]

Bibliography

  • Coleman, Ted. Jack Northrop and the Flying Wing: The Real Story Behind the Stealth Bomber. New York: Paragon House, 1988. ISBN   1-55778-079-X.
  • Darling, Kev. American X&Y Planes: Volume 1: Experimental Aircraft to 1945. Marlborough, UK: The Crowood Press, 2010, First edition 2009. ISBN   978-1-84797-141-8.
  • Donald, David, ed. "Northrop Flying Wings". Encyclopedia of World Aircraft. Etobicoke, Ontario: Prospero Books, 1997. ISBN   1-85605-375-X.
  • Maloney, Edward T. Northrop Flying Wings. Corona del Mar, California: World War II Publications, 1988. ISBN   0-915464-00-4.
  • O'Leary, Michael. "Wings of Northrop, Part One". Air Classics, Volume 43, Number 12, December 2007, Challenge Publications, Inc. ISSN 0002-2241.
  • Pape, Garry and John Campbell. Northrop Flying Wings: A History of Jack Northrop's Visionary Aircraft. Atglen, PA: Schiffer Publishing, Ltd., 1995. ISBN   0-88740-689-0.
  • Wooldridge, E. T. Winged Wonders: The Story of the Flying Wings. Washington, D.C.: Smithsonian Institution Press, 1983. ISBN   0-87474-966-2