Panzerschreck (lit. "tank fright", "tank's fright" or "tank's bane") was the popular name for the Raketenpanzerbüchse 54 ("Rocket Anti-armor Rifle Model 54", abbreviated to RPzB 54), an 88 mm reusable anti-tank rocket launcher developed by Nazi Germany in World War II. Another earlier, official name was Ofenrohr ("stove pipe"). The Panzerschreck was designed as a lightweight infantry anti-tank weapon and was an enlarged copy of the American bazooka. The weapon was shoulder-launched and fired a fin-stabilized rocket with a shaped-charge warhead. It was made in smaller numbers than the Panzerfaust, which was a light, disposable anti-tank weapon that used a system not unlike those of recoilless rifles. The Panzerschreck development was initially based on the American "bazooka", captured during the Tunisian campaign, November 1942. The Panzerschreck was larger and heavier than its American counterpart – the Panzerschreck had an 88 mm calibre, compared to the 60 mm calibre of the bazooka – which meant that it could penetrate thicker armor, but also produced more smoke when firing. Calibre 88 mm was selected as the existing RPzB. Gr. 4312 for 8.8 cm Raketenwerfer 43 was reused for Panzerschreck. Warhead and fuzing was carried over, but the rocket motor's housing needed lengthening from to to accommodate the longer rocket motor. Raketenwerfer 43 had percussion firing, whereas for the Panzerschreck an electrical priming was selected, forming standard grenade RPzB. Gr. 4322. Other munitions were developed, including drill dummy, practice live rocket with inert warhead and standard grenade with improved contact system. The earliest production model of the RPzB 54 was long and weighed about when empty. Unlike the rockets used in American bazookas which extinguished before leaving the tube, the RPzB rockets kept burning for about after exiting the tube. Users were instructed to wear heavy gloves, a protective poncho and a gas mask without a filter to protect them from the heat of the backblast when the weapon was fired.