Mack (ship)

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In naval architecture, a Mack is a structure which combines the radar MAsts and the exhaust stACK of a surface ship, thereby saving the upper deck space used for separate funnels and the increasingly large lattice masts used to carry heavy radar aerials. The word itself is a composite of "mast" and "stack". It is a common design feature on postwar warships, (e.g. the rebuilt Baltimore class cruisers), and on some Cruise ships.

The Royal Navy used this design feature on the 1944 Weapon class destroyers, and the subsequent Darings, as well as the diesel-engined Type 41 "Cat" class and Type 61 "Cathedral" class frigates of the 1950s. It provided unbalanced and unattractive designs, which led to a reversion to separate masts and funnels in subsequent RN vessels.

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