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TOPIC: 20lb Fragmentation Bomb

20lb Fragmentation Bomb 03 Mar 2016 20:21 #1

  • Harboda77
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Found in the John Young collection details of this aircraft perforation device used by the American Airforce in 1943.

The outside was wrapped in a special spring which broke into numerous pieces when the bomb exploded.

The largest pieces known as Group Number 3 weighting 750 to 2500 grams had an initial velocity of 4000 to 5000 feet per second and travel up to 500 yards.

The smaller fragments inside classed as Group 0 ( Upto 75 grams ), Group 1 ( 75 to 150 grams ), Group 2 ( 150 to 750 grams ) would perforate any aircraft within a radius of 20 yards from the point of explosion.

The total number of fragements in each bomb ranged between 1000 to 1500 with 20 plus B17's dropping in excess of 3000 individual bombs per airfield attacked with this devise.

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20lb Fragmentation Bomb 03 Mar 2016 20:29 #2

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Paul Bellamy
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ARG Archive, Alconbury

20lb Fragmentation Bomb 03 Mar 2016 21:17 #3

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20lb Fragmentation Bomb 03 Mar 2016 21:41 #4

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Yes, that's a pair of M1A1 (100lb size) Frag Clusters, with six 20lb M41s loaded on each.

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ARG Archive, Alconbury

20lb Fragmentation Bomb 04 Mar 2016 07:08 #5

  • PETERTHEEATER
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The RAF also used the US 20 lb Frag Bomb in Cluster contatiners. One of the Fuze options (I think it was 104) was impact sensitive and the RAF modified the Fuze by inserting an extra spring to the pressure plate.

There was a fatal accident on a USAAF British airbase during WW2 when a single bomb fell as it was being loaded and detonated.

EDIT:

A modified version of the bomb with tail drag 'chute for low altitude attack:

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Last Edit: by PETERTHEEATER. Reason: Add diagram of 20 lb Frag Bomb modifed

20lb Fragmentation Bomb 06 Mar 2016 22:34 #6

  • superplum
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The RAF had them quite a bit later and used a Fuze No 873 which was much safer. I remember "blowing" one on my EOD course in mid-75. The fragments made quite a whistle!

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20lb Fragmentation Bomb 07 Mar 2016 02:33 #7

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Yes, that was postwar. Midwar on as the RAF/USAAF shared some bomb types both AFs used the AN 104 Fuze but due to poor safety this was superceded by the AN 120 but the mechanical design of both was unsatisfactory from a safety point of view hence the introduction of the British fuze. The USAAF after fatal accidents introduced strict procedures for bomb loading.

The RAF used the 20 pound Frag during Operation Firedog in Malaya against Chin Peng and his CTs.

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Last Edit: by PETERTHEEATER. Reason: Add content

20lb Fragmentation Bomb 10 May 2017 06:06 #8

  • Bures
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Fragmentation bombs were also stored outside at the Bures FAD
Local farmer recalls how the casing was "scored", to fracture more easily

www.bures.me.uk/FAD/Yankee%20Rd.htm

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Last Edit: by Bures. Reason: update text
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