This site contains information about Panther tank ausf g.
The Panther was born out of a project started in 1938 to replace the Panzer III and Panzer IV tanks. The initial requirements of the VK 20 series called for a fully tracked vehicle weighing 20 tonnes and design proposals by Krupp, Daimler Benz and MAN ensued. These designs were abandoned and Krupp dropped out of the competition entirely as the requirements increased to a vehicle weighing 30 tonnes, a direct reaction to the encounters with the Soviet T-34 and KV-1 tanks and against the advice of Wa Pruef 6. [Notes 1] The T-34 outclassed the existing models of the Panzer III and IV. At the insistence of General Heinz Guderian, a special tank commission was created to assess the T-34. Among the features of the Soviet tank considered most significant were the sloping armour, which gave much improved shot deflection and also increased the effective armour thickness against penetration, the wide track, which improved mobility over soft ground, and the 76. 2 mm (3. 00 in) gun, which had good armour penetration and fired an effective high explosive round. Daimler-Benz (DB), which designed the successful Panzer III and StuG III, and Maschinenfabrik Augsburg-Nürnberg AG (MAN) were given the task of designing a new 30- to 35-tonne tank, designated VK 30. 02, by April 1942.