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Shell 105 mm FD Illuminating L43A2 (fuzed)
Регіон
India
Категорія
Ammunition, Missiles and precision weapons
The Shell 105 mm FD Illuminating L43A2 (fuzed) is the 105 mm L43A2 Illuminating is a comparatively thin-walled base ejection shell fitted with a single drive band. The base of the body is closed by a baseplate held in position with three shear pins. The outer face of the baseplate is recessed to provide an unbalanced condition, preventing damage to the parachute after ejection. The interior contains the ejection (black powder G4) and ignition charges, the flare canister and its parachute, the latter housed in a
metal-sided tube in two halves. At the time selected, the fuze functions to ignite the ejection charge which in turn ignites the ignition charge. The ejection charge builds up pressure which forces down on the flare canister and tube halves. The three shear pins then break to allow the baseplate, flare parachute and canister to eject, with the baseplate moving to one side due to its unbalanced state. As this is happening the ignition charge ignites the flare composition which is magnesium and sodium nitrate bonded by a resin. The ignition charge used with the L43A2 incorporates a 1.7 second delay, which the earlier L43A1 was lacking. The usual operating height is 400 m, depending on the cloudbase, and the flare will burn for up to 40 seconds to produce a brilliancy of 900,000 to 1 Mcd (1 Lx). Rate of descent is less than 10 m/s. The Charge system is assembled in brass cartridge cases, Normal (L35A1/A2) having five increments and Super (L36A2/A3), a unitary charge. Ignition is by an electric primer ( L10A1 ) fitted in the cartridge base. Also available is the Cartridge 105 mm FD Training L45A1. See separate entry for details. The 105 mm L43A2 Illuminating shell is of Swedish design and manufacture and corresponds approximately to the Bofors AB (originally FFV Ordnance) 105 mm Illuminating Projectile LUMA Mk 2 (see separate entry for details). It was originally procured for the 105 mm L13A1 ordnance used on the Vickers Defence Systems FV433 Abbot Self-propelled Gun, although the Illuminating L43A2 is now used with the RO Defence 105 mm L118 Light Gun as the Abbot has been withdrawn from service with the British Army. RO Defence 105 mm Light Guns are in service in at least 18 countries. Well over 1,000 units have been produced.