Tallboy (bomb)

Tallboy
RAF ground crew handling the Tallboy that was later dropped on the La Coupole V-weapon site at Wizernes, France, 1944
Type	Earthquake bomb
Place of origin	United Kingdom
Service history
In service	8 June 1944 – 25 April 1945
Used by	No. 9 Squadron RAF, No. 617 Squadron RAF
Wars	World War II
Production history
Designer	Barnes Wallis
Manufacturer	Vickers
No. built	854[1]
Specifications
Mass	Approx 12,000 lb (5,400 kg)
Length	21 ft (6.4 m)
Diameter	38 in (97 cm)
Filling	Torpex D1
Filling weight	5,200 lb (2,400 kg)
Detonation mechanism	No. 58 fuze, built from No. 30 Pistol (impact detonation) or No. 47 time delay fuze inserted into tetryl boosters in the rear of the casing.

Tallboy or Bomb, Medium Capacity, 12,000 lb was an earthquake bomb developed by the British aeronautical engineer Barnes Wallis and used by the Royal Air Force (RAF) during the Second World War.^[a]

At 5 long tons (5.1 t), it could be carried only by a modified model of the Avro Lancaster heavy bomber. It proved to be effective against large, fortified structures where conventional bombing had proved ineffective.

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