The factory-produced B-25G entered production during the NA-96 order followed by the redesigned B-25H gunship. The gunship design concept dates to late 1942 and NAA sent a field technical representative to the SWPA. Further development led to the B-25H, B-25J, and B-25J2. Similar armament upgrades by U.S-based commercial modification centers involved about half of the B-25G series. The NA-100 of 19 was an interim armament development at the Kansas City complex known as the B-25D2. Also in 1942, the manufacturer began design work on the cannon-armed B-25G series. ![]() Before the year was over, NAA was producing the B-25C and B-25D series at different plants. Combat requirements led to further developments. Both the B-25A and B-25B series entered USAAF service. NAA continued design and development in 19. Less noticeable changes during this period included an increase in the size of the tail fins and a decrease in their inward tilt at their tops. "Flattening" the outer wing panels by giving them a slight anhedral angle just outboard of the engine nacelles nullified the problem and gave the B-25 its gull wing configuration. The first nine aircraft had a constant- dihedral, meaning the wing had a consistent, upward angle from the fuselage to the wingtip. North American B-25 Mitchell production in Kansas City in 1942Įarly into B-25 production, NAA incorporated a significant redesign to the wing dihedral. ![]() In September 1939, the Air Corps ordered the NA-62 into production as the B-25, along with the other new Air Corps medium bomber, the Martin B-26 Marauder "off the drawing board". No YB-25 was available for prototype service tests. The Air Corps issued a specification for a medium bomber in March 1939 that was capable of carrying a payload of 2,400 lb (1,100 kg) over 1,200 mi (1,900 km) at 300 mph (480 km/h) North American Aviation (NAA) used its NA-40B design to develop the NA-62, which competed for the medium bomber contract. These included several limited models such as the F-10 reconnaissance aircraft, the AT-24 crew trainers, and the United States Marine Corps' PBJ-1 patrol bomber. Produced in numerous variants, nearly 10,000 B-25s were built. ![]() Used by many Allied air forces, the B-25 served in every theater of World War II, and after the war ended, many remained in service, operating across four decades. The North American B-25 Mitchell is an American medium bomber that was introduced in 1941 and named in honor of Brigadier General William "Billy" Mitchell, a pioneer of U.S.
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