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In order to reduce the alarming rate of Stateside training accidents, a decision was made to increase the wing area in order to lower the wing loading, reducing the takeoff and landing speeds. The new wing was first introduced on the B-26C production block at Omaha, and did not appear on the B-26B line at Baltimore until the introduction of the B-26B-10-MA production block, which first appeared in January of 1943. The wing span increased from 65 to 71 feet and area increased from 602 to 658 square feet. A taller fin and rudder was introduced to maintain stability with the larger wing, increasing overall height from 19 feet 10 inches to 21 feet 6 inches.
However, the advantages of the reduced wing loading were partially offset by an increase in gross weight to 38,200 pounds as the result of the fitting of additional armament. A total of twelve 0.50-inch machine guns were now carried. These comprised a flexible 0.50-inch nose gun with 270 rounds, a single fixed gun on the starboard side of the nose with 200 rounds, two "package" guns on each side of the fuselage below the cockpit with 200-250 rpg, two 0.50-inch guns in the rear dorsal turret, two 0.50-inch guns in the beam, and two 0.50 inch guns in the tail. Nevertheless, at a takeoff weight of 36,000 pounds, the takeoff run was reduced from 3150 to 2850 feet. However, the larger wing area resulted in a decrease in maximum speed from from 289 to 282 mph.
The B-26B-15-MA differed only in having the fixed oxygen system Type A-9 regulator deleted. Improved IFF equipment (SCR-595A) was also fitted.
On the B-26B-20-MA and later blocks, the hand-held twin tail guns were replaced by a power-operated Martin-Bell M6 turret, also with two 0.50-inch guns with 400 rpg. The guns were positioned below the gunner and afforded a wider field of fire. The blunt tail cone of this installation markedly altered the contours of the rear fuselage. The guns were operated by a remotely-controlled linkage, but gunners usually preferred to swing the guns manually. Provisions were made for two more 250-US gallon tanks in the aft bomb bay, bringing total fuel capacity to 1964 US gallons. Another noticeable external change was the use of a shorter-chord rudder.
An external curved armor plate was introduced on the B-26B-30-MA, along with additinal armor in certain critical locations.
The carburetor alcohol de-icing system was deleted on the B-26B-35-MA.
The B-26B-40-MA introduced a torpedo-firing switch on the pilot's control column. Shark-nosed ailerons were fitted in 42-43310 onward.
B-26B-45-MA indroduced a ring-and-bead sight for the package guns IFF SCR-695 was provided and the new SCR-522 VHF command radio set was added. The engine fire extinguisher was reinstated. The aft bomb bay was sealed shut from this variant onward, the extra space being used for additional ammunition. The fixed forward-firing 0.50-inch gun was deleted in the middle of the production run (from 42-95979).
The B-26B-50-MA was equipped with an emergency mechanial bomb bay closing arrangement. IFF gear was revised. Lycoming propeller blades began to be fittef from 42-95942 onward.