The most outrageous tank ever if completed
http://www.panzerbaer.de/workshop/wdieb_mod_87-a.htm
Though the webby's in german but i know this monster weighs in at
1800 tons at full combat load and has a planned armament fit of 2
280mm guns similar to those of the Gneisenau class, 1 128mm gun, 8
20mm Flaks and several 15mm MG 151 machine guns.
The engines required to move this behemoth were actually marine
engines!! There were 2 powerplant options, one with a set of 8
Daimler Benz cylinder marine diesel engines delivering 16000hp, the
other with a pair of MAN cylinder marine diesel engines delivering
17000hp. Speed was estimated at best to be 40km/h on ideal road
conditions.
The minimum armour thickness is already 150mm thick with a max of
360mm. Only naval guns have the punch to hurt her. Enemy armor
posed almost no conceivable threat to the Ratte. They might have
destroyed things like the AA guns on the turret or damaged radio
antennae or weapon optics, but beyond minor damage enemy tanks were
toys next to this mammoth vehicle.