Why an RPG Round Doesn't Actually Explode on Mud

Added: 2026-06-03

[00:00:00]An RPG seven round can penetrate 500 mm of rolled steel. It can be defeated by 6 in of wet mud. Those two facts exist simultaneously. The RPG-7's PG-7V warhead detonates via a piezoelectric fuse, a crystal in the nose cone that generates an electrical charge on impact. That charge fires the detonator.

[00:00:21]The shape charge collapses inward, projecting a copper jet at 8,000 m/s into the target. The problem: Piezoelectric fuses require a hard, sudden impact to generate sufficient voltage. Mud absorbs the kinetic energy over a longer contact period. The pressure rise is gradual rather than instantaneous. The crystal generates insufficient charge. The fuse fails. The round is physically lodged in the mud with its warhead intact. This is why improvised standoff screens, chain-link fencing, chicken wire, >> [music] >> metal mesh became standard on vehicles in Iraq and Afghanistan. They do not stop the round. They trigger premature detonation, [music] ensuring the shape charge jet dissipates in air before reaching the hull. The weapon that defeats tank armor is defeated by a material with no [music] structural value. The fuse is the vulnerability, not the warhead.