The Admiral Lazarev class was a pair of monitors built for
the Imperial Russian Navy in the late 1860s (designated frigates by the navy).
Four ships were ordered, but the last two were significantly modified and
became the separate Admiral Spiridov class of ships. Admiral Lazarev and
Admiral Greig became the first turreted warships in the Russian Navy.
The ships were similar in size to earlier Russian ironclads.
They had a shorter beam due to the turret, rather than broadside weaponry. A
longer draft made the ships more stable at the sea. Due to the heavy weight,
the masts of the ships were significantly lighter and smaller than initially
planned, but the more powerful 2,000 horsepower (1,500 kW) engine made the
ships somewhat faster than earlier monitors, with the top speed of 11 knots (20
km/h).
The ships were protected by a 4.5 in (114 mm) armor belt and
turrets by 6.5 in (165 mm) armor. The main armament was three gun turrets, each
with two 9-inch (229 mm) guns. Later, all four ships had turrets refitted with
11-inch (279 mm) guns, one gun per turret. With the new guns, the Admiral
Lazarev and Admiral Spiridov classes became among the most powerful ships of
the Baltic Fleet.
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