During the Second World War the German army expressed the specific need to have a heavy tank available, characterized by a high protective armor and armed with a high-speed gun capable of defeating any kind of enemy tank. Ferdinand Porsche developed the prototype for the VK 4501 (P) heavy tank to meet the request. The tank introduced various innovative solutions for that time, but not sufficiently reliable. During the tests, the tank even revealed some weaknesses in the drive system and in the engine that do not allow mass production to continue. The German army preferred the Henschel prototype, the VK 4501 (H), which became the development base for the famous and deadly Tiger I. However, from the first production batch of the VK 4501 (P), Porsche released versions other than the new heavy Jagdpanzer 'Ferdinand' on which the longer 88mm gun was mounted.