Imperial Russian monitor Novgorod: Circular warship that turned out to be an incredibly bad idea
HMS M1: Submersible Battleship that failed to understand the importance of "structural integrity"
German M-class cruiser: Plagued with problems throughout construction until eventually cancelled
German aircraft carrier Graf Zeppelin: Remained in an unfinished state throughout the duration of the war through a combination of internal politics and doubts about her usefulness
IIRC, Novgorod didn't actually spin that much. Quoth Wikipedia.
Novgorod was armed with two 20-calibre 11-inch rifled muzzle-loading guns. The guns could penetrate 11 inches of armour at a range of 800 yards (730 m); their 489-pound (222 kg) shells had a muzzle velocity of 1,290 feet per second (392 m/s). Their rate of fire was very slow, about one round every 10 minutes. The guns were mounted on separate revolving turntables that could be moved independently or locked together. Each turntable took about two or three minutes to rotate 180°. Gunnery trials in November 1874 showed that the locks for the turntables were too weak; so much so that the gun's recoil could cause them to rotate, leading to the persistent myth that the whole ship rotated when a gun fired. Reinforcement of the locks solved the problem, but the myth persisted.
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