German Super-Battleship "Der Führer"

There is the battleship "Bismarck" for comparison.

The plans were awesome but many considered them fool hardy, but no one wanted to tell this to Hitler. He wanted the biggest battleship in the world and indeed the design was drawn up for this monster. It was to displace 122,000 tons, have eight 21 inch guns and travel at about 30 knots. The problem was that this ship would have been almost twice the size of the Yamato and no docking facility was big enough for it. It would also be very hard to maneuver. Worst of all was the fact that the steel it needed for its construction would have meant that nothing else could have been built during its construction. As the war neared its end, Hitler finally gave up on its construction

More about the details:
Displacement: (700,000 tons planned) 462,750 tons light; 484,920 tons standard; 560,057 tons normal service; 617,927 tons full load
Dimensions:
Length: 2,000’ (609.60m)
Beam: 300’ (91.44m)
Draft: 55’ (16.75m)
Armament:
Main: 8 – 31.5” (80cm) Gustav siege guns (4 x 2)
Secondary: 12 – 9.45”/73 (24cm) Long Range AA guns (12 x 1)
Tertiary: 24 – 5.04”/60 (12.8cm) AA guns (12 x 2)
Light: 5.5cm/77 Gerat 58, 30mm AA guns
(Broadside = 131,574 lbs/59,631 kg)
Aircraft: 15 aircraft
Armor:
Belt: 14.96” (380mm) Deck: 14.96” (380mm)
Turrets: 25.96” (660mm) Conning tower: 24.8” (630mm)
Machinery: 8 shafts, (480,000 shp planned) 498,735 shp/372,057 kw
Performance: 28 knots; Range: 30,000 nm @ 20 knots
Complement: (5,000 planned) 10,236 – 13,307
Distribution of weights:
Armament: 16,425 tons = 2.9%
Armor: 158,660 tons = 28.3%
Machinery: 11,931 tons = 2.1%
Hull, fittings & equipment: 274,955 tons = 49.1%
Fuel, ammunition & stores: 97,307 tons = 17.4%
Miscellaneous weights: 750 tons = 0.1%

This is a 700,000 ton German battleship built to carry a battery of eight 80 cm/31.5 guns, the siege gun Gustav. This is strictly a flight of fancy taken from remarks made by Hitler that he wanted to mount 80 cm guns on the H-class. It was estimated that it would take a 700,000 ton ship to mount them.

Rate of fire for the main battery would be quite slow, one round per gun every five minutes or more while the AA defense would be much more rapid. The AP shell weighed over 15,000 lbs with 441 lbs of burster while the HC shell weighed over 10,000 lbs with 882 lbs of burster.

The 24 cm/73 AA armament was based upon a Kriegsmarine late war study to develop a land based high altitude gun firing a 300 plus pound shell up to 59,000 feet. It is possible that a 700,000 ton ship could carry twelve of these in single double purpose mounts, partly to make up for the slow rate of fire of the 80cm main battery and to engage cruisers.

The 5"/60 were probably Germany's best AA weapon at the end of the war and would have served this mastodon well.

There is no detail information regarding the ship’s power plant. The total SHP required for a ship of this size dictated at least 8 shafts. Based on the extended range of these ships it would appear that a portion of the power plant was diesel.

Eventhough Schwere Gustav and Dora had caliber lengths of 40 calibers.
The Fuhrer uses the naval standard 52cal 800mm guns.