Variants
In keeping with the wartime German design philosophy of mounting an existing anti-tank gun on a convenient chassis to give mobility, several tank destroyers and infantry support guns were built around the Panzer IV hull. Both the Jagdpanzer IV, initially armed with the 75-millimetre (2.95 in) L/48 tank gun, and the Krupp-manufactured Sturmgeschütz IV, which was the casemate of the Sturmgeschütz III mounted on the body of the Panzer IV, proved highly effective in defense. Cheaper and faster to construct than tanks, but with the disadvantage of a very limited gun traverse, around 1,980 Jagdpanzer IV's and 1,140 Sturmgeschütz IVs were produced. Another tank destroyer, the Panzer IV/70, used the same basic 75 millimeter L/70 gun that was mounted on the Panther.
Another variant of the Panzer IV was the Panzerbefehlswagen IV (Pz.Bef.Wg. IV) command tank. This conversion entailed the installation of additional radio sets, mounting racks, transformers, junction boxes, wiring, antennas and an auxiliary electrical generator. To make room for the new equipment, ammunition stowage was reduced from 87 to 72 rounds. The vehicle could coordinate with nearby armor, infantry or even aircraft. Seventeen Panzerbefehlswagen were converted from Ausf. J chassis, while another 88 were based on refurbished chassis.
The Panzerbeobachtungswagen IV (Pz.Beob.Wg. IV) was an artillery observation vehicle built on the Panzer IV chassis. This, too, received new radio equipment and an electrical generator, installed in the left rear corner of the fighting compartment. Panzerbeobachtungswagens worked in cooperation with Wespe and Hummel self-propelled artillery batteries.
Also based on the Panzer IV chassis was the Sturmpanzer IV Brummbär 150-millimetre (5.91 in) infantry-support self-propelled gun. These vehicles were primarily issued to four Sturmpanzer units (Numbers 216, 217, 218 and 219) and used during the battle of Kursk and in Italy in 1943. Two separate versions of the Sturmpanzer IV existed, one without a machine gun in the mantlet and one with a machine gun mounted on the mantlet of the casemate. Furthermore, a 105-millimetre (4.13 in) artillery gun was mounted in an experimental turret on a Panzer IV chassis. This variant was called the Heuschrecke, or Grasshopper. Another 105 mm artillery/anti-tank prototype was the 10.5 cm K (gp.Sfl.) nicknamed Dicker Max.
Four different self-propelled anti-aircraft vehicles were built on the Panzer IV hull. The Flakpanzer IV Möbelwagen was armed with a 37-millimetre (1.46 in) anti-aircraft cannon; 240 were built between 1944 and 1945. In late 1944 a new Flakpanzer, the Wirbelwind, was designed, with enough armor to protect the gun's crew and a rotating turret, armed with the 20mm quadmount Flakvierling anti-aircraft cannon system; at least 100 were manufactured. Sixty-five similar vehicles were built, named the Ostwind, but with a single 37-millimetre (1.46 in) anti-aircraft cannon instead. This vehicle was designed to replace the Wirbelwind. The final model was the Flakpanzer IV Kugelblitz, of which only five were built. This vehicle featured a covered turret armed with twin 30-millimetre (1.18 in) anti-aircraft cannons.
Although not a direct modification of the Panzer IV, some of its components, in conjunction with parts from the Panzer III, were utilized to make one of the most widely-used self-propelled artillery chassis of the war—the Geschützwagen III/IV. This chassis was the basis of the Hummel artillery piece, of which 666 were built, and also the 88 millimetres (3.46 in) gun armed Nashorn tank destroyer, with 473 manufactured. To resupply self-propelled howitzers in the field, 150 ammunition carriers were manufactured on the Geschützwagen III/IV chassis.
Another rare variant was the Bergepanzer IV armored recovery vehicle. Some were believed to be converted locally, 21 were converted from hulls returned for repair between October 1944 and January 1945. The conversion involved removing the turret and adding a wooden plank cover with access hatch over the turret ring. In addition a 2 ton jib crane and rigid towing bars were fitted.
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