Home Aircraft / Aviation Naval Warfare Land Systems Small Arms

Northrop N-9M

Flying Wing Prototype Aircraft

The Northrop N-9M flying wing prototype proved critical to the development of the XB-35 flying wing program that followed.
Authored By: Staff Writer | Last Edited: 4/18/2019
Before the famous Northrop B-2 "Spirit" stealth bomber became a reality, Jack Northrop persevered in bringing a viable military-minded flying wing design into existence. From the twin-tail X-216H came the tail-less N-1M of 1941 which proved many qualities of the Northrop vision sound. Having sold the United States Army Air Force (USAAF) on the idea of a flying wing strategic bomber (to become the prop-powered "YB-35"), Northrop moved on producing a 1/3 scale prototype of this aircraft to represent the finalized product and work out any potential issues all the while collecting much needed flight data in the process. This endeavor then became the "N-9M" which appeared in 1942 and four examples were eventually built.

The contract for development of the full-scale YB-35 bomber came about in October of 1941, months ahead of the American entry into World War 2 (1939-1945). The N-9M emerged as a critical tool in understanding the various effects of tail-less aircraft flight as well as management of large surface area controlling and handling. The prospect of a flying wing was an exciting one, promising natural lifting tendencies, a shallower profile, and increased internal volume for fuel and weapons. The initial aircraft, N-9M-1, was lost to a crash on May 19th, 1943 (sadly fatal for the test pilot at the controls). The N-9M-2 and N-9M-A then followed, culminating in the final prototype vehicle - the N-9M-B - which benefited from lessons learned in the previous three airframes.

As built, the N-9M series mimicked much of what was already seen in the preceding N-1M research aircraft. The flying wing took on a boomerang-type, top-down profile with the cockpit centrally placed within the thickest part of the wing. While sitting under a largely unobstructed canopy, the pilot had to content with the massive wing surface area restricting vision out of the cockpit. The engines were buried within the design with drive shafts emanating from the upper surface and driving two-bladed propeller assemblies in a "pusher" arrangement. Since the N-9M lacked vertical fins, control surfaces were worked into the flying wing's trailing edges. The undercarriage was fully retractable, giving the aircraft a very pleasing and streamlined shape.

Crew accommodations amounted to one pilot. Overall length measured 17 feet, 9 inches with a wingspan reaching 60 feet and a height of 6 feet, 7 inches. Gross weight totaled 14,000lbs. Power was supplied from 2 x Menasco C6S-4 Buccaneer inverted 6-cylinder, air-cooled, in-line piston engines developing 275 horsepower each. Maximum speed was 260 miles per hour with a range out to 500 miles. Its service ceiling reached 21,500 feet.

The N-9M test vehicle first achieved flight on December 27th, 1942 and a further 45 flights then followed. However, many proved maddening affairs due to the temperamental technology and mechanics involved, particularly in the choice of powerplant. The aforementioned "N-9M-B" test vehicle then emerged with 2 x Franklin XO-540-7 series engines now developing 300 horsepower as a result.

With the end of World War 2 in 1945, many programs initially backed with great interest by the U.S. military were either curtailed or given up for good. The USAF cancelled the YB-35 initiative during 1949 after prototypes and pre-production systems were already in play. The N-9M had now seen its best days behind it and all but one (prototype N-9M-B) were scrapped.

Suffering from neglect for years in the California climate, N-9MB was eventually restored to flying condition and remains a salvaged piece of aviation history today. Despite the loss of the potential YB-35 strategic bomber contract, the USAF commissioned Northrop for a revised jet-powered form, this becoming the "YB-49". However, these only ever existed in prototype forms themselves but went on to heavily influence the B-2 bomber program some decades later - Northrop's flying wing military bomber finally realized.


Retired, Out-of-Service
[ 4 Units ] :
Northrop - USA
National flag of United States United States
- X-Plane / Developmental
17.72 ft (5.4 m)
60.04 ft (18.3 m)
6.56 ft (2 m)
(Showcased structural dimension values pertain to the Northrop N-9M production model)
Empty Weight:
5,886 lb (2,670 kg)
13,946 lb (6,326 kg)
(Diff: +8,060lb)
(Showcased weight values pertain to the Northrop N-9M production model)
2 x Menasco C6S-1 inverted aircooled straight-six engines developing 275 horsepower each (original); 2 x Franlin XO-540-7 engines developing 300 horsepower each (N-9M-B).
(Showcased powerplant information pertains to the Northrop N-9M production model)
Maximum Speed:
258 mph (415 kph; 224 kts)
Service Ceiling:
21,490 feet (6,550 m; 4.07 miles)
Maximum Range:
500 miles (805 km; 435 nm)
(Showcased performance values pertain to the Northrop N-9M production model; Compare this aircraft entry against any other in our database)
(Showcased armament details pertain to the Northrop N-9M production model)
N-9M - Base Series Designation
N-9M-1 - Initial prototype; 2 x Menasco C6S-4 Buccaneer engines of 275 horsepower; lost to fatal crash during testing.
N-9M-2 - Second prototype
N-9M-A - Third prototype
N-9M-B - Final prototype; 2 x Franklin XO-540-7 engines of 300 horsepower.

Disclaimer | Privacy Policy | Cookies

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes AnvilOfWar.com, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and WDMMA.org, the World Directory of Modern Military Aircraft.

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-