British Bomb, 20 lb Frag, US Modified
This bomb consists of a US 20 lb Fragmentation Bomb, which has been altered by the attachment of a special British parachute housing. The bomb consists of cast-steel nose and tail sections threaded to a seamless steel inner tube. Helically wrapped around this inner steel tube is a heavy, drawn steel wire to provide effective fragmentation. The nose and tail sections are threaded internally; the former to receive the nose fuze, and the latter to receive the parachute housing.
The British No. 14 Parachute Housing consists of a cast-aluminum tray containing a 12-in. diameter parachute. The tray is closed by a loosely fitting metal lid to which the parachute is attached by a short loop of cord. The shroud lines of the parachute are fitted through holes drilled around the bottom edge of the tray, and are secured by a metal ring passed through the loops of the lines. Leading from the parachute is an arming line, spliced to the arming wire from the fuze. Release of the parachute withdraws the arming wire from the fuze, allowing the fuze to arm after a few seconds delay.
Although the bomb is provided with a single, U-shaped, steel eyebolt welded to the bomb body for individual suspension, these bombs will be carried by the RAF in Cluster Projectiles No. 23 Mk 1 and No. 24 Mk 1. In these clusters the nose of one bomb bears against the parachute lid of the one behind it, holding the lid in place until the cluster opens. The air slip then removes the housing lid, which acts as a pilot parachute and pulls out the 12-in. diameter parachute by which the bomb is suspended.
Because of the extreme sensitivity of the Fuze AN-M104, an extra spring, located outside the fuze body beneath the pressure plate, is added when this fuze is employed in these bombs by the RAF