North American B-25 Mitchell

North American B-25 Mitchell
Name	B-25 Mitchell
Caption	A B-25J in flight.
Type	Medium bomber
National origin	United States
Manufacturer	North American Aviation
Designer	John L. "Lee" Atwood
First flight	19 August 1940
Introduction	1941
Retired	1979 (Indonesia)
Primary user	United States Army Air Forces
Number built	9,816
Developed from	North American NA-40
Developed into	North American XB-28 Dragon

North American B-25 Mitchell. The North American B-25 Mitchell was an American twin-engine medium bomber developed and produced by North American Aviation for the United States Army Air Forces during World War II. Named in honor of Major General Billy Mitchell, a pioneer of U.S. military aviation, it became one of the most versatile and widely used aircraft of the war, seeing service in every theater of operations. Its most famous mission was the Doolittle Raid on Tokyo in 1942, which provided a significant morale boost for the Allies following the attack on Pearl Harbor.

Development and design

The design originated from a 1938 United States Army Air Corps requirement for a new medium bomber, leading to the North American NA-40 prototype. After the NA-40's crash, a redesigned model, the NA-62, was ordered into production in September 1939. Key figures in its development included John L. "Lee" Atwood and the project's chief engineer, Raymond Rice. A distinctive design feature, a gull wing configuration, was adopted to accommodate the large-diameter propellers of its two Wright R-2600 Cyclone engines while maintaining adequate ground clearance. The aircraft featured a tricycle landing gear, a relatively novel design for bombers at the time, and a crew of five to six. The definitive B-25B variant, used for the Doolittle Raid, removed the ventral gun turret to save weight and increase fuel capacity.

Operational history

The B-25 entered service with the United States Army Air Forces in 1941. Its legendary status was cemented on 18 April 1942, when sixteen B-25B aircraft, led by Lieutenant Colonel Jimmy Doolittle, launched from the USS *Hornet* to bomb Tokyo and other Japanese cities. In the Pacific Theater of Operations, it proved exceptionally effective in the South West Pacific Area under General George Kenney, who pioneered devastating low-level skip bombing tactics against Japanese shipping. In the Mediterranean Theater, B-25s operated from bases in North Africa and Italy, striking targets across the Axis-held Balkans. On the Eastern Front, over 800 were supplied to the Soviet Air Forces via Lend-Lease, where they were used extensively for ground attack. It also served with distinction in the China Burma India Theater with the Fourteenth Air Force and was adapted as a heavily armed gunship for anti-shipping strikes by the Fifth Air Force.

Variants

Numerous variants were produced to fulfill evolving combat roles. The initial production models were the B-25A and B-25B, the latter used for the Doolittle Raid. The B-25C and B-25D introduced improved engines and de-icing equipment. The B-25G and B-25H were radical gunship variants, the H-model mounting a 75 mm M4 cannon in the nose and up to fourteen .50 caliber M2 Browning machine guns. The most produced version was the B-25J, which could be configured as a strafer with eight nose guns or as a traditional bomber with a glazed nose. Specialized versions included the F-10 reconnaissance model, the TB-25 trainer, and the PBJ-1 used by the United States Marine Corps. Post-war, many were converted into executive transports, designated the VB-25.

Operators

The primary operator was the United States Army Air Forces and its successor, the United States Air Force. It was also used extensively by the United States Marine Corps as the PBJ-1. Major Allied operators included the Royal Air Force, the Royal Canadian Air Force, and the Soviet Air Forces. Post-war, it saw widespread service with air forces around the world, including the Royal Netherlands Air Force, the Brazilian Air Force, the French Air Force, the Republic of China Air Force, and the Indonesian Air Force, which operated the type until 1979.

Specifications (B-25J)

* **Crew:** 5-6 (pilot, co-pilot, navigator/bombardier, turret gunner, waist gunner) * **Length:** 52 ft 11 in (16.13 m) * **Wingspan:** 67 ft 7 in (20.60 m) * **Height:** 16 ft 4 in (4.98 m) * **Empty weight:** 19,480 lb (8,836 kg) * **Max takeoff weight:** 35,000 lb (15,876 kg) * **Powerplant:** 2 × Wright R-2600-92 Cyclone 14-cylinder air-cooled radial piston engines, 1,700 hp (1,300 kW) each * **Maximum speed:** 272 mph (438 km/h, 236 kn) at 13,000 ft (4,000 m) * **Range:** 1,350 mi (2,170 km, 1,170 nmi) * **Service ceiling:** 24,200 ft (7,400 m) * **Armament:** Up to 18 × .50 caliber M2 Browning machine guns; 3,000 lb (1,360 kg) bombs internally, plus 2,000 lb (910 kg) on external racks

Surviving aircraft

A significant number of B-25s survive in museums and in airworthy condition, a testament to the large production run and the aircraft's enduring popularity. Notable examples include the "Yellow Rose" and "Panchito," which are frequently seen at airshows. The Commemorative Air Force operates several flyable Mitchells. One of the Doolittle Raid aircraft is displayed at the National Museum of the United States Air Force at Wright-Patterson Air Force Base. Other major museums housing B-25s include the Imperial War Museum Duxford, the Pima Air & Space Museum, and the Yanks Air Museum.

Category:World War II bombers of the United States Category:North American Aviation aircraft Category:Twin-engine aircraft