"air fist"), was a German prototype of a man-portable, multi-barreled, unguided rocket launcher, designed to destroy enemy ground attack planes.

These fired 20mm calibre projectiles (weighing 90g and containing 19g of explosive) which were standard 20 mm Minengeschoss as used in German aircraft cannon, propelled by a small rocket and stabilised with fins.

The delay was meant to prevent the projectiles from getting damaged by the previous launches' exhaust fumes, which could also interfere with their courses.

Some sources,[clarification needed] however, state that the barrels were fired individually with a delay of 2 seconds between each ignition.

However, a 1945 photograph of the Hotel Adlon, directly opposite the Brandenburg Gate in Berlin, clearly shows at least 3 expended Fliegerfaust B's lying in the rubble.