In 1939, the USAAC issued a requirement for a new medium bomber which could operate at high-altitude to avoid attack from ground fire. Preliminary designs were submitted by Martin and North American. The Martin XB-33 was redesigned from the B-26 Marauder, and North American XB-28 was based from the B-25 Mitchell. In 1940, both designs were awarded prototype contracts. The full-scale development of the XB-33 was begun in late 1940, and as it progressed, the Martin engineers found that a two-engine aircraft would not be capable of achieving the performance required in the Army specification. It was decided to radically alter the original design by adding two more engines. The entire project was scaled up to the approximate size of the Boeing B-29. The Army was sufficiently impressed with the new design; the two prototypes were redesignated XB-33A and an order for 400 production B-33A Super Marauders was placed. In 1944, Martin was awarded a contract to assemble B-29s which were urgently needed to enter Pacific theater. As B-29s had top priority to use the inventory, the entire B-33A order was cancelled before the prototypes were completed.

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High-altitude heavy bomber

To designed as replacement of the B-26 Marauder.

134ft.

79ft.10in.

24ft.

4x Wright R-2600-15 radials engine

345 mph

7

8x 0.5 inch machine gun / 10,000 pounds bomb load

The Martin XB-33A Super Marauder is suitable to group with the following collection series.

U.S.A.A.F.  bomber in World War II 1937~1945

Boeing B-17 Flying Fortress

Douglas B-18 Bolo

Douglas XB-19A Flying Behemoth

Boeing XB-20

North American XB-21 Dragon

Douglas XB-22 Bolo

Douglas B-23 Dragon

Consolidated B-24 Liberator

North American B-25 Mitchell

Martin B-26 Marauder

Martin XB-27

North American XB-28

Boeing B-29 Superfortress

Lockheed XB-30 Constellation

Douglas XB-31 Raidmaster

Consolidated B-32 Dominator

Martin XB-33A Super Marauder

Lockheed B-34 Ventura

Northrop XB-35 Flying Wing

Convair XB-36 Peacemaker

Lockheed B-37 Lexington

Boeing-Lockheed-Vega XB-38

Boeing XB-39 Spirit of Lincoln

Boeing-Lockheed-Vega YB-40

Consolidated-Vultee XB-41

Douglas XB-42 (XA-42) Mixmaster

Douglas XB-43 Jetmaster

War-time U.S. heavy bomber

Consolidated B-24 Liberator

Boeing B-29 Superfortress

Lockheed XB-30 Constellation

Douglas XB-31 Raidmaster

Consolidated B-32 Dominator

Martin XB-33A Super Marauder

Northrop XB-35 Flying Wing

Convair XB-36 Peacemaker

Martin B-26 Marauder family