Flakpanzer IV is the general designation for a series of self-propelled anti-aircraft guns based on the Panzerkampfwagen IV chassis. They are, in order of development:
Möbelwagen (furniture van) – Originally developed as the Flakpanzer 38(t); entered into production in 1943. Wirbelwind (whirlwind) – Installed an open-top rotating turret; introduced at the end of 1943. Ostwind (east wind) – Ordered in August 1944 to replace the Wirbelwind. Kugelblitz (ball lightning) – First prototypes delivered in February 1945.
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