Reply #59: Like Thermobaric Devices [View All]

[Kai]

http://www.globalsecurity.org/military/systems/munitions/blu-118.htm
Global Security.Org

Excerpt;
BLU-118/B Thermobaric Weapon

The BLU-118/B nomenclature was first reported on 21 December 2001, and this weapon is clearly unrelated to the BLU-118 500 lb. napalm canister used during the Vietnam war.

The BLU-118/B is a penetrating warhead filled with an advanced thermobaric explosive that, when detonated, generates higher sustained blast pressures in confined spaces such as tunnels and underground facilities. The BLU-118/B uses the same penetrator body as the standard BLU-109 weapon. The significant difference is the replacement of the high explosive fill with a new thermobaric explosive that provides increased lethality in confined spaces.

The BLU-118/B warhead uses a Fuze Munition Unit (FMU)-143J/B to initiate the explosive. The FMU-143 fuze has been modified with a new booster and a 120-millisecond delay. All weapon guidance systems and employment options currently used with the BLU-109 warhead are compatible with the new BLU-118/B warhead.

BLU-118/B payload candidates included PBXIH-135 , HAS-13, or SFAE loaded into existing BLU-109 Weapon Bodies. Conventional high explosives (CHE) are characterized by a sensitivity to mechanical or thermal energy. Insensitive high explosives (IHE), on the other hand, require extraordinarily high stimuli before violent reaction occurs. Insensitive explosives reliably fulfil their performance, readiness and operational requirements on demand, but the violence of response to unplanned hazardous stimuli is restricted to an acceptable level. This means that when a munition is in a fire, hit by a fragment, bullet or high velocity projectile or subject to some other hazard the result will not be a detonation or a violent reaction of the explosive and propellant; no more than severe burning will ocur . Some insensitive explosives are known to react in a different way to conventional explosives. For instance, detonation reactions are slower but more energy is released in a way that has the potential to produce a lot more damage.

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The BLU-118B was successfully tested at the Nevada Test Site on 14 December 2001. During that test, a Guided Bomb Unit (GBU)-24 laser-guided weapon using the BLU-118B warhead was dropped from an F-15E attack aircraft. The laser-guided bomb was "skipped" into a tunnel and exploded with a delayed fuze, which produced a significant growth in overpressure and temperature in the tunnel. When compared to the standard BLU-109 explosive, results showed the new thermobaric weapon generated a significant improvement in overpressure and pressure-impulse in the tunnel complex. The test culminated a two-month accelerated effort to rapidly transition a developmental explosive to improve lethality against underground facilities. DTRA weaponized and delivered (within 60 days) 10 thermobaric-filled air delivered munitions (BLU-118B) designed to enhance lethality in tunnel environments.