YB-35

YB-35
U.S. Air Force · Public domain · source
Name	YB-35
Type	Flying wing heavy bomber prototype
Manufacturer	Consolidated Aircraft, later Convair
First flight	1946
Primary user	United States Army Air Forces, United States Air Force

YB-35 The YB-35 was an American prototype flying-wing heavy bomber developed in the mid-1940s by Consolidated Aircraft/Convair for the United States Army Air Forces and later evaluated by the United States Air Force. Conceived during World War II and flown after the war, it embodied radical aerodynamics from designers affiliated with Northrop Corporation and earlier experimental work such as the Northrop N-1M. The program intersected with postwar debates in Pentagon procurement, strategic doctrine linked to the Strategic Air Command, and emerging jet-era concerns represented by projects like the Boeing B-47 Stratojet.

Development

Conceived in response to a 1941 United States Army Air Corps requirement for long-range strategic bombers, the Consolidated proposal combined swept, tailless planform principles developed by aviation figures associated with Jack Northrop and influenced by interwar research at institutions such as the National Advisory Committee for Aeronautics (NACA). A formal contract led to prototype construction at Consolidated’s facilities in San Diego, where Concordant wartime production for models like the B-24 Liberator coexisted with conceptual work. The first flying wing prototype took shape amid postwar organizational change when Consolidated merged into Convair and when the United States Air Force separated from the Department of War during the National Security Act of 1947 era. Program oversight involved liaison with Wendell L. Willkie-era industrial policy influencers and testing regimes centered at Muroc Army Air Field (later Edwards Air Force Base).

Design

The YB-35 employed a pure flying wing layout with no distinct fuselage or vertical tail surfaces, drawing on stability concepts explored in experimental aircraft including the Northrop YB-49 and the earlier Northrop Gamma lineage. Its airframe integrated thick-section laminar flow wing structures similar in intent to contemporary studies at NACA Langley Research Center and used multiple reciprocating engines—initially radial powerplants of the Pratt & Whitney family—mounted in nacelles that drove large-diameter propellers. The crew compartment and payload were blended into the wing center section, enabling low wetted-area and theoretical aerodynamic efficiency sought by strategic planners like those in Strategic Air Command. Control employed elevons, drag rudders, and differential power techniques that referenced stability research from the National Advisory Committee for Aeronautics and lessons from aerodynamicists such as Theodore von Kármán. Structural materials and production techniques echoed practices used on the B-24 Liberator while adopting novel assemblies for the wingbox and integral fuel tanks.

Operational history

Flight test began in 1946 at Muroc Army Air Field, with evaluations conducted by test pilots linked to Air Materiel Command and the Flight Test Division; these sorties revealed handling challenges, vibration issues, and engine-coupling complexities that prompted iterative modifications. The program faced administrative scrutiny amid shifting priorities toward jet-propelled bombers championed by figures such as Hugh Dryden and service advocates for the Boeing B-52 Stratofortress and Boeing B-47 Stratojet. Political and industrial disputes, including procurement controversies involving the Grumman and Boeing companies, influenced funding. Despite demonstrations of range and payload potential comparable to requirements from the Army Air Forces strategic planners, the YB-35’s development was curtailed as the United States Air Force redirected resources to jet-era designs and the competing flying-wing YB-49 underwent parallel evaluation, leading to eventual program termination. Test data from the YB-35, however, informed later aerodynamic and stability analysis at NACA and influenced stealth-conceptual work within research circles.

Variants

- XB-35: initial prototype series ordered by the United States Army Air Forces; embodied original piston-powered configuration and early systems. - YB-35: service-test aircraft delivered to the United States Air Force for evaluation; included refinements to control surfaces and crew systems. - Proposed conversions: planned retrofits to turboprop or turbojet powerplants were studied amid postwar propulsion advances led by manufacturers such as General Electric and Allison. - Related designs: contemporaneous developments included the Northrop YB-49 jet-powered flying wing and other experimental platforms examined by Air Materiel Command.

Survivors and preservation

Few complete airframes survived program cancellation and subsequent scrapping common to surplus postwar projects; components and documentation entered repositories including archives at National Air and Space Museum and technical files at NACA successor organizations. Portions of YB-35 structural elements, wind tunnel models, and blueprints are preserved in institutional collections at museums such as the Smithsonian Institution and regional aviation museums in California. Oral histories from pilots and engineers who worked on the program are held in archives at facilities including Edwards Air Force Base and university special collections that document Cold War-era aviation transitions.

Specifications

- Crew: multiple flight and mission personnel typical of strategic bomber crews as defined by United States Army Air Forces doctrine - Powerplant: multiple radial engines (Pratt & Whitney series) driving large propellers; later studies considered turboprops from General Electric - Wingspan: very large flying wing span comparable to heavy bomber requirements articulated by Strategic Air Command planners - Performance: projected long-range, high-payload capability aimed at intercontinental missions emphasized in World War II-era strategic studies

Category:Convair aircraft Category:United States bomber aircraft 1940–1949