B43 nuclear bomb

The B43 was a United States air-dropped variable yield nuclear weapon used by a wide variety of fighter bomber and bomber aircraft.

The B43 was developed from 1956 by Los Alamos National Laboratory, entering production in 1959. It entered service in April 1961. Total production was 2,000 weapons, ending in 1965. Some variants were parachute-retarded and featured a ribbon parachute.

The B43 was built in two variants, Mod 1 and Mod 2, each with five yield options. Depending on version, the B43 was 18 inches (45 cm) in diameter, and length was between 12 ft 6 in and 13 ft 8 in (3.81 m and 4.15 m). The various versions weighed between 2,060 lb and 2,125 lb (935 kg to 960 kg). It could be delivered at altitudes as low as 300 ft (90 m), with fuzing options for airburst, ground burst, free fall, contact, or laydown delivery. Explosive yield varied from 70 kilotons of TNT to 1 megaton of TNT.

The B43 used the Tsetse primary design for its fission stage, as did several mid- and late-1950s designs.

The B43 was one of four thermonuclear gravity bombs carried by Canadian CF-104 jets while serving in Germany between June 1964 and 1972.

Carrier aircraft included most USAF, USN and USMC fighters, bombers and attack aircraft, including the A-3 Skywarrior, A-4 Skyhawk, A-5 Vigilante, A-6 Intruder, A-7 Corsair II, B-47 Stratojet, B-52 Stratofortress, B-58A Hustler, F-100 Super Sabre, F-105 Thunderchief, F-4 Phantom II, F-104 Starfighter, FB-111A strategic bomber variant, F-15E Strike Eagle, F-16 Fighting Falcon and the F/A-18 Hornet. The B-1B Lancer was also intended to carry the B43, though it remains unclear whether this particular aircraft was ever type-approved to carry the B43 prior to the B-1's reassignment to conventional strike roles. The B43 was also supplied for delivery by Royal Air Force Canberra and Valiant aircraft assigned to NATO under the command of SACEUR.

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