Description
RPG-7 with warhead detached
The launcher is reloadable and based around a simple milled steel tube, 40 millimeters in diameter, 95.3 centimeters long, and weighing 7 kilograms. The middle of the tube is wood wrapped to protect the user from heat and the end is flared to assist in blast shielding and recoil reduction. Sighting is usually optical with a back-up iron sight, and passive infra-red and night sights are also available.
As with similar weapons, the grenade protrudes from the launch tubes. It is 40-105 millimeters in diameter and weighs between 2.5 and 4.5 kilograms. It is launched by a gunpowder booster charge, giving it an initial speed of 115 meters per second, and creating a cloud of light grey-blue smoke. The rocket motor ignites after 10 meters and sustains flight out to 500 meters at a maximum velocity of 295 meters per second. The grenade is stabilized by two sets of fins that deploy in-flight: one large set on the stabilizer pipe to maintain direction and a smaller front set to induce rotation. The grenade can fly up to 1,100 meters; the fuze sets the maximum range, usually 920 meters.
Accurate firing is difficult at ranges over 300 meters and with the RPG-7 the phrase "the closer the better" is always true. During the Soviet invasion of Afghanistan the mujahideen tended to use the weapon at ranges of less than 80 meters. They were used in the Vietnam war to counter the introduction of the lightly armored M113. This was countered by the mounting of barbed wire bundles to predetonate the warheads. US armoured vehicles in Iraq have been fitted with "birdcage" slat armour to protect against RPGs.
The RPG-7 was used by the Provisional Irish Republican Army in Northern Ireland from 1969 to 2005, most notably in Lurgan, County Armagh, where it was used against British Army observation posts and the towering military base at Kitchen Hill in the town[citation needed].
[edit] Propulsion system
RPG-7
According to the United States Army Training and Doctrine Command (TRADOC) Bulletin 3u (1977) Soviet RPG-7 Antitank Grenade Launcher -- Capabilities and Countermeasures, the RPG-7 munition has 2 sections: a "booster" section and a "warhead and sustainer motor" section. These must be assembled into the ready-to-use grenade. The booster consists of a "small strip powder charge" that serves to propel the grenade out of the launcher, the sustainer motor ignites and propels the grenade for the next few seconds, reaching a speed of 294 meters per second. The TRADOC bulletin provides anecdotal commentary that the RPG-7 has been fired from within buildings, which agrees with the two-stage design. It is stated that only a 2-meter standoff to a rear obstruction is needed for use inside rooms or fortifications. The fins not only provide drag stabilization, but are designed to impart a slow rotation to the grenade.
Due to the configuration of the RPG-7 sustainer/warhead section, it responds counter-intuitively to crosswinds. A crosswind will tend to exert pressure on the stabilizing fins, causing the projectile to turn into the wind. While the rocket motor is still burning, this will cause the flight path to curve into the wind. The TRADOC bulletin explains aiming difficulties for more distant moving targets in crosswinds at some length, as the RPG-7 optical sight reticle is somewhat challenging.
RPG-7 with warhead detached
The launcher is reloadable and based around a simple milled steel tube, 40 millimeters in diameter, 95.3 centimeters long, and weighing 7 kilograms. The middle of the tube is wood wrapped to protect the user from heat and the end is flared to assist in blast shielding and recoil reduction. Sighting is usually optical with a back-up iron sight, and passive infra-red and night sights are also available.
As with similar weapons, the grenade protrudes from the launch tubes. It is 40-105 millimeters in diameter and weighs between 2.5 and 4.5 kilograms. It is launched by a gunpowder booster charge, giving it an initial speed of 115 meters per second, and creating a cloud of light grey-blue smoke. The rocket motor ignites after 10 meters and sustains flight out to 500 meters at a maximum velocity of 295 meters per second. The grenade is stabilized by two sets of fins that deploy in-flight: one large set on the stabilizer pipe to maintain direction and a smaller front set to induce rotation. The grenade can fly up to 1,100 meters; the fuze sets the maximum range, usually 920 meters.
Accurate firing is difficult at ranges over 300 meters and with the RPG-7 the phrase "the closer the better" is always true. During the Soviet invasion of Afghanistan the mujahideen tended to use the weapon at ranges of less than 80 meters. They were used in the Vietnam war to counter the introduction of the lightly armored M113. This was countered by the mounting of barbed wire bundles to predetonate the warheads. US armoured vehicles in Iraq have been fitted with "birdcage" slat armour to protect against RPGs.
The RPG-7 was used by the Provisional Irish Republican Army in Northern Ireland from 1969 to 2005, most notably in Lurgan, County Armagh, where it was used against British Army observation posts and the towering military base at Kitchen Hill in the town[citation needed].
[edit] Propulsion system
RPG-7
According to the United States Army Training and Doctrine Command (TRADOC) Bulletin 3u (1977) Soviet RPG-7 Antitank Grenade Launcher -- Capabilities and Countermeasures, the RPG-7 munition has 2 sections: a "booster" section and a "warhead and sustainer motor" section. These must be assembled into the ready-to-use grenade. The booster consists of a "small strip powder charge" that serves to propel the grenade out of the launcher, the sustainer motor ignites and propels the grenade for the next few seconds, reaching a speed of 294 meters per second. The TRADOC bulletin provides anecdotal commentary that the RPG-7 has been fired from within buildings, which agrees with the two-stage design. It is stated that only a 2-meter standoff to a rear obstruction is needed for use inside rooms or fortifications. The fins not only provide drag stabilization, but are designed to impart a slow rotation to the grenade.
Due to the configuration of the RPG-7 sustainer/warhead section, it responds counter-intuitively to crosswinds. A crosswind will tend to exert pressure on the stabilizing fins, causing the projectile to turn into the wind. While the rocket motor is still burning, this will cause the flight path to curve into the wind. The TRADOC bulletin explains aiming difficulties for more distant moving targets in crosswinds at some length, as the RPG-7 optical sight reticle is somewhat challenging.
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