Giat 105 mm Illuminating - OECL 105 F1

both under a piston plate. When the time fuze functions at a range between 100 and 2,500 m from the gun muzzle, ideally at an altitude of about 350 m, it ignites the expulsion charge which creates sufficient internal pressure to push down on the piston plate and contents to force off the projectile's base plug. The expulsion charge also ignites a short delay train which ignites two separate flare containers in the flare assembly; the illuminating composition weighs 460 g. As the flare assembly is ejected the parachute deploys to stabilise the assembly and slow down the rate of descent. The flares burn for approximately 35 seconds, illuminating an area with an initial diameter of 900 m. The OECL 105 F1 uses an Mle F2 brass or steel cartridge case of the M148 or M150 type with a TPA electrical primer in the base. The charge is a nominal 1.25 kg of multiperforated single-base propellant. This propellant load produces a muzzle velocity of 290 m/s. Maximum effective combat range is 825 m. The 105 mm Illuminating OECL 105 F1 is intended to illuminate areas at ranges between 1,000 and 2,500 m from the tank. This round is no longer in production. Applications include CN105F1 series tank guns; 105 mm 105 G2 gun; all 105 mm L7, Rh 105 and M68 series tank guns and South African GT7 tank gun.