Major changes were incorporated into the B-26 design beginning with the block 10 B model (and block 5 C model). The wing span was increased from 65 to 71 feet to decrease the high wing loading and improve the handling of the aircraft, particularly at landing speeds. The wing was also modified by adding flaps outboard of the engine nacelles to further improve take off and landing performance. The vertical stabilizer was heightened by 20 inches to 21 feet, 6 inches and made the late model B-26s easily distinguished from the "short tail" early models.
Like the B-25, the forward armament of the B-26 was increased for ground strafing missions. The nose featured one fixed and one flexible .50-cal. machine gun while four fixed fuselage-mounted .50-cal. package guns were added just behind and below the cockpit.
Differences between late production B models included a switch from manually operated tail guns to powered types, relocation of the waist gunner positions and various engine cowling changes. Many aircraft were modified in the field incorporating improvements from later model production. Armor plating was added to the aircraft's exterior just below and slightly forward of the wind screen to protect the pilot and co-pilot. Block 45 and later B-26Bs had a larger windscreen designed for better forward visibility.
1,883 B-26Bs were built; 1,242 of these were block 10 or later.
41-18185 to 41-18334
41-31573 to 41-31672
41-31673 to 41-31772
41-31773 to 41-31872
41-31873 to 41-31972
41-31973 to 41-32072
42-43260/43357; 43360/43361; 43459
42-95738 to 42-95828
42-95829 to 42-96028
42-96029 to 42-96228
TECHNICAL NOTES (B-26B-10-MA): Armament: 12 .50-cal. machine guns plus 5,200 lbs. of bombs (maximum overload) or one externally mounted torpedo Engines: Two Pratt & Whitney R-2800-43 Double Wasp radials of 2,000 hp each (takeoff power) Maximum speed: 282 mph at 15,000 ft. Cruising speed: 214 mph Range: 1,150 miles with 3,000 lbs. bomb load; 2,850 miles (maximum) Service ceiling: 21,700 ft. Span: 71 ft. 0 in. Length: 58 ft. 3 in. Height: 21 ft. 6 in. Weight: 38,200 lbs. (maximum) Crew: Seven