Comprehensive Northrop YB-35 Flying Wing Technical Documentation

This digital collection assembles authentic technical manuals for one of aviation's most ambitious and revolutionary aircraft designs. The Northrop YB-35 Flying Wing represented Jack Northrop's visionary pursuit of the ultimate bomber configuration, pioneering concepts decades ahead of their time. These original documents provide detailed specifications and procedures used by Army Air Forces crews and maintenance personnel during this groundbreaking aircraft's development and testing.

Historical Note

The Northrop YB-35 Flying Wing emerged from a 1941 Army Air Corps requirement for a long-range strategic bomber capable of striking targets across the Atlantic or Pacific oceans. Designer Jack Northrop, who had pursued flying wing concepts since the 1920s, saw this as the perfect opportunity to prove his radical theory: that eliminating the fuselage and tail surfaces would create an aircraft with unprecedented efficiency, range, and performance.

The YB-35's design was breathtaking in its ambition. With a wingspan of 172 feet—nearly as wide as a Boeing 747—and no conventional fuselage or tail, the aircraft was essentially a single massive wing. Four Pratt & Whitney R-4360 Wasp Major radial engines, the most powerful piston engines ever mass-produced at 3,000 horsepower each, drove contra-rotating propellers buried in the wing's trailing edge. The crew of nine operated from pressurized compartments within the wing, while internal bomb bays could carry up to 51,000 pounds of ordnance.

Northrop's flying wing promised revolutionary advantages: by eliminating the drag of a fuselage and tail, the aircraft would achieve exceptional range and fuel efficiency. The entire structure contributed to lift, maximizing payload capacity while minimizing weight. Theoretical calculations suggested the YB-35 could fly 10,000 miles—enough to strike any target on Earth from American bases and return without refueling.

Development proved extraordinarily challenging. The tailless configuration created complex stability and control problems that pushed 1940s engineering to its limits. Without vertical and horizontal tail surfaces, the aircraft relied on innovative control systems including split ailerons that functioned as both roll and yaw controls, and elevons that combined elevator and aileron functions. The massive contra-rotating propellers, while theoretically efficient, suffered from chronic mechanical problems and severe vibration issues.

The first YB-35 finally flew on June 25, 1946—five years after the initial contract and a year after World War II ended. Test pilots reported that the aircraft handled surprisingly well at altitude, with smooth, stable flight characteristics. However, the propeller problems proved intractable, causing severe vibrations that threatened structural integrity and made precision bombing impossible. Maintenance requirements were staggering, with the complex contra-rotating propeller systems requiring constant attention.

By 1947, the Army Air Forces (now the independent U.S. Air Force) faced a dilemma. The YB-35's performance, when the propellers worked properly, validated some of Northrop's theories about flying wing efficiency. However, the propeller problems appeared unsolvable with existing technology, and the new jet age offered an alternative solution. The decision was made to convert two YB-35 airframes to jet power, creating the YB-49.

Only 13 YB-35s were completed from an original order for 200 aircraft. Most never flew operationally, serving instead as test beds and engineering studies. The program was officially cancelled in 1949, with surviving aircraft scrapped by 1950. The massive investment in time, money, and engineering effort appeared to have produced nothing but an expensive failure.

However, history would vindicate Jack Northrop's vision. The YB-35 and its jet-powered YB-49 successor proved that flying wings could fly—the problems were technological, not fundamental. Decades later, computer-controlled fly-by-wire systems would solve the stability issues that plagued the YB-35, while modern materials and manufacturing techniques would enable the precision required for such radical designs. In the 1980s, Northrop's company developed the B-2 Spirit stealth bomber—a flying wing that finally realized Jack Northrop's dream.

Today, the Northrop YB-35 is remembered as a magnificent failure that was simply too far ahead of its time. The aircraft demonstrated extraordinary vision and engineering ambition, pushing the boundaries of what was possible with 1940s technology. While it never entered production, the YB-35 laid the groundwork for future flying wing designs and stands as a testament to the courage required to challenge conventional thinking in pursuit of revolutionary advancement.

What's Included

This collection contains essential technical references for the Northrop YB-35:

• Flight Operating Manuals – Complete pilot procedures, flying wing handling characteristics, performance data, and emergency protocols
• Maintenance Instructions – Detailed servicing procedures, inspection schedules, and troubleshooting guides
• Parts Catalogs – Illustrated parts breakdowns with nomenclature and part numbers
• Technical Orders – Official modifications, updates, and service bulletins
• Structural Repair Manuals – Airframe repair procedures and specifications
• Systems Documentation – Powerplant, flight control, hydraulic, and electrical systems
• Engineering Documentation – Technical diagrams and design specifications
• Test Reports – Flight test data and evaluation documentation

Digital Delivery

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