Bofors 40 mm

Bofors 40 mm
País	Reino unido
Tipo	Arma antiaérea
Período	Segunda Guerra Mundial

Galeria de fotos em um Bofors 40 mm, O Bofors de 40 mm est un canon antiaérien suédois en activité lors de la seconde guerre mondiale. Ce canon antiaérien Bofors foi usado por praticamente todos os componentes dos exércitos aliados, com os americanos usando uma versão derivada do Gun M1 automático de 40mm (AA).

Fonte: Wikipédia

Bofors 40 mm – Walk Around
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Fotos	91

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40mm Bofors Walk Around
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Bofors de 40mm

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The QF (Quick Fire) 40 mm Bofors gun was a Swedish-designed, fully automatic anti-aircraft weapon adopted by the British military in 1937. It became one of the most critical and ubiquitous light anti-aircraft (LAA) weapons used by the Allies throughout World War II, celebrated for its high rate of fire, accuracy, and robust design.

Origin and Design

Designer: AB Bofors, Sweden.
Adoption: The British Army secured a license to manufacture the weapon domestically, which was standardized as the QF 40 mm Mk I (and later simplified production models like the Mk III). The gun’s engineering was converted from metric to imperial measurements for mass production.
Action: The gun operates using a long-recoil system with a vertical sliding breechblock. The action automatically opens the breech, ejects the spent casing, and loads the next round, ready to fire again.

Key Specifications (L/60 Model)

The L/60 designation refers to the barrel length being approximately 60 calibres, though the actual barrel length was slightly less.

Characteristic	Valor
Calibre	40 mm
Ammunition	40×311 mm R (Rimmed) cartridge
Projectile Weight	Approx. 2 lbs (0.9 kg) High-Explosive (HE) shell
Muzzle Velocity	Approx. 2,800 ft/s (850 m/s)
Cyclic Rate of Fire	120 rounds per minute (rpm)
Feed System	Manual loading via four-round stripper clips
Towed Weight (Mk II Carriage)	Approx. 1.9 tons

British Deployment and Usage

The Bofors was used in two primary categories of mounts:

1. Land-Based (British Army)

Mounting: Most commonly deployed on a four-wheel towed carriage. When emplaced, the wheels were splayed and four leveling jacks provided a stable, 360° traversing platform.
Fire Control: The British developed sophisticated sighting systems, notably the Stiffkey Sight and later the advanced Kerrison Predictor. The Kerrison Predictor was an analog computer that used external power to automatically aim and track fast-moving aircraft, providing a revolutionary capability for the time.
Papel: Highly effective during the Battle of Britain and the Blitz against low-level attackers and dive-bombers. It also proved useful as an anti-personnel and anti-light-armour weapon.

2. Naval-Based (Royal Navy)

Mounting: Used extensively on Allied warships, often in single, twin, or quadruple mountings. Naval mounts frequently featured water-cooled barrels for sustained fire.
Papel: Served as the standard close-range anti-aircraft weapon, particularly effective against Japanese *kamikaze* attacks in the Pacific theater, often replacing the less effective British 2 pdr “Pom-Pom.”