I suppose the Landkreuzer P. 1500 Monster also deserves a mention.
It’s kinda interesting exploring the math for some of these super tanks.
The Landkreuzer P. 1000 was estimated to weigh 1,000 tons. The Schwerer Gustav railway gun, which was actually built by Krupp and used, weighs 1,350 tons. The Landkreuzer P. 1500 was estimated to weigh 1,794 tons.
A Heinkel He 111 weighs 10 tons and carries approximately 2.2 tons of bombs. That makes a single Landkreuzer P.1000 is worth 100 Heinkel 111s, a Schwerer Gustav worth 130 Heinkel He 111s, and a Landkreuzer P.1500 worth 171 Heinkel He 111s.
The Schwerer Gustav and Landkreuzer P.1500 both fire an 8 ton shell. The Landkreuzer P.1000 fires a shell weighing about 775 pounds.
The Schwerer Gustav required about 4,000 men to move and make ready to fire. A Heinkel He 111 has a crew of 5. Multiplying 130 Heinkels times 5 crew each is 650 men, leaving 3,350 men for ground support versus the Schwerer Gustav.
It seems like the math always favors heavy lift aircraft versus super guns and super tanks. Maybe Krupp should have contracted with Heinkel to build bombers under license?
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A while back, Copper State Models released CAD drawings of a Tsar Tank. Does anyone know what happened to that project?
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A few years back, Lindybeige released a fun video covering 21 tank concepts that never quite made it. Unlike most such videos, this one features many models on loan from a museum in Belgium for a Tankfest.
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When writing my original response, I thought about nuclear powered tanks. Many of those old, experimental, mobile nuclear reactors are now major environmental hazards. One wonders how many terrors await in the wilderness areas of China and Siberia.