Within months a new class was layed down, this becoming the Zerstorer 1936A - named the "Narvik class" by the Allies after the battle at Narvik. The 1936 A was a larger and more powerful ship, being 3,605 tons and fitted with larger guns and substantially improved defensive anti-aircraft armament when compared to the type 1936. However she developed problems with the high-pressure steam engines and tended to take on water because of the heavy gun mounts fitted to the bow. The German navy built eight such ships in the 1936A class, numbered Z23 to Z30. With minor differences from the 1936 and the 1936A, the Kriegsmarine built a seven-version class called the Zerstorer 1936A (MOB) featuring more tonnage - 3,700 tons - and larger, more durable engines with continued hull numbers from Z31 to Z39.
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