The E-75 was an experimental German heavy tank from the Second World War that never entered mass production. It was probably armed with the KwK 43 L / 71 or L / 100 88 mm cannon or the 105 mm long-range cannon and 1 or 2 machine guns MG34 cal. 7.92 mm.
Design work on the E-75 tank was initiated in as part of the Entwicklungsserie program, i.e. a program for the development of German armor, which was to lead to the creation of a standardized design for a series of six combat vehicles of different weights, but using as many common components as possible. Analytical and conceptual work under this program was initiated in mid-1943. The E-75 tank in this project was to be a new heavy tank of the German army, in which particular emphasis was placed on possibly thick armor and the greatest possible ability to fight enemy armored vehicles. Most likely, the vehicle was to use an appropriately rebuilt and redesigned Schmallturm turret and - most likely - the hull and chassis of the Pz.Kpfw VI Tiger II, which it was to eventually replace in the line.
The Flak 40 is a German 128mm heavy anti-aircraft gun from the Second World War. The first prototypes of the guns were created in 1937, and in 1942 serial production began, ending with the production of about 600 guns of this type. The maximum vertical range was 14,800 m, and the initial velocity of the projectile was 880 m / s.
The Flak 40 was developed as part of the Rheinmetall project, which dates back to 1936, of a new heavy anti-aircraft gun. As the bombings on German cities were not perceived in the years 1937-1941, the work on Flak 40 was of a very low priority. This fact changed in 1942, which led to the implementation of a new gun into production. Originally, it was planned to create a mobile version of the Flak 40, but it was quickly switched to the production of only a stationary version, which was mounted on fortified sites or on the so-called "Flakturm Zoo". An attempt was also made to produce a double Flak 40 gun (the so-called 12.8 cm Flakzwilling 40/2), but production ended with the production of about 40-50 pieces of this weapon.