If-14 Artillery Shell

A German artillery shell design from the 1940s that was intended to be a high-explosive, long-range shell, but was ultimately not produced due to the war’s end.

If-15 Aircraft Engine

A Japanese aircraft engine design from the 1940s that was intended to be a powerful, high-performance engine, but was ultimately not produced due to material shortages.

If-3 Fighter

A proposed Soviet fighter aircraft design from the 1930s that was ultimately not built due to technical difficulties.

If-4 Bomber

A German bomber aircraft design from the 1940s that was intended to be a long-range strategic bomber, but was never built due to the war’s end.

If-5 Tank

A British tank design from the 1940s that was intended to be a heavy tank, but was ultimately rejected due to cost and complexity.

If-6 Submarine

A Japanese submarine design from the 1940s that was intended to be a large, long-range submarine, but was never built due to material shortages.

If-7 Anti-Aircraft Gun

A German anti-aircraft gun design from the 1940s that was intended to be a high-velocity, long-range gun, but was ultimately not produced due to the war’s end.

Hv-4200

A German tank design that incorporated innovative technologies, such as a jet-assisted propulsion system for increased speed. It was intended to be a highly mobile tank, but the project was abandoned due to the war’s end.

Hv-4400

A German tank design that was intended to be a highly armored tank. It was designed to be a formidable opponent to Allied tanks, but the project was abandoned due to the war’s end.

Hv-4600

A German tank design that was intended to be a highly versatile tank. It was designed to be capable of operating in a variety of roles, including infantry support, anti-tank warfare, and reconnaissance. However, the project was abandoned due to the war’s end.