Wikia

Crude but easy to manufacture, the Ork Rokkit Launcha is a stout tube with a simple trigger mechanism that allows the Ork at the "safe" end to fire a dodgy-looking Rokkit in the general vicinity of the enemy. The Rokkit Launcha resembles a slapdash "Orky" version of an ancient German panzerfaust; a single shot, hip-fired, rocket-propelled grenade. Rokkits can be loaded one at a time, or loaded automatically from a magazine if the weapon is a bit more complex than the usual slap-dash launcher. Orks can use it on the move with no noticeable loss of accuracy. Its simplicity makes it very easy to manufacture and it is a fairly common Ork special weapon.

Sometimes Ork Boyz equip themselves with Rokkit Launchas which gives their mob the ability to shoot down armoured vehicles. In most cases, this weapon will find its way into the hands of just such a Tankbusta mob (the Ork equivalent of anti-armour infantry), but other mobs usually have one Ork armed with a Rokkit Launcha for every 10 Boyz in the mob, making it one of the more common heavy weapons found amongst Greenskins. This allows mobs of Ork Boyz to have some response to armoured targets at range. A Rokkit Launcha is also often mounted on an Ork vehicle like a Warbuggy or a Killa Kan and can be also combined with a Shoota to make a potent Ork Kombi-weapon.