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XB-33 Super Marauder
Role Medium bomber
National origin United States
Manufacturer Glenn L. Martin Company
Status Cancelled 25 November 1942
Primary user United States Army Air Forces (intended)
Number built None
Developed from Martin B-26 Marauder

The Martin XB-33 Super Marauder was a proposed World War II American bomber aircraft. It was designed by the Glenn L. Martin Company as the Martin Model 190 and was a high-altitude derivative of the company's B-26 Marauder. Two different designs were developed, first as a twin-engined aircraft and then as a four-engined aircraft. The four-engined version was ordered by the United States Army Air Forces, but the program was cancelled before any aircraft were built.

Design and development


Schematic blueprint drawing of the XB-33.
Schematic blueprint drawing of the XB-33.

The first version of the B-33 design, the XB-33, was a twin-tailed medium bomber with two Wright R-3350 engines and pressurised crew compartments; its design began in 1940. It would carry around 4,000 lb (1,814 kg) of bombs. Soon after design of the XB-33 began it became clear that a twin-engined aircraft would not achieve the performance requested by the army. The company moved on to developing a larger four-engined design, but the two prototypes ordered by the USAAF were not built.


Following the abandonment of the original twin-engined design, the company continued to design a larger four-engined aircraft, and two prototypes were ordered by the USAAF as the XB-33A; its bombload was to have been 12,000 lb (5,443 kg), as much as that of the B-24 Liberator, the heaviest US bomber flown in combat prior to the B-29.

The original XB-33 design was to have been powered by the R-3350, the redesigned XB-33A was to have used Wright R-2600 engines. The main reason for this was the demand for R-3350s for the B-29, one of the most highly valued projects of the Army Air Forces.

On January 17, 1942, the USAAF placed an order for 400 B-33As, to be built at the government-owned plant in Omaha, Nebraska, operated by Martin. On November 25, 1942, the project was cancelled to allow the Omaha plant to concentrate on manufacturing B-29s.


Prototype medium bomber powered by two 1,800 hp (1,343 kW) R-3350 engines, two cancelled.[1]
Prototype medium bomber powered by four 1,800 hp (1,343 kW) R-2600-15 engines, two cancelled.[1]
B-33A Super Marauder
Production variant of XB-33A, 400 on order cancelled.[1]

Specifications (B-33A, as designed)

General characteristics



See also

Related development

Related lists



  1. ^ a b c Andrade 1979, p 51