Mack (naval architecture) on:
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In naval architecture
Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and op ...
, a mack is a structure which combines the radar
Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
masts and the exhaust stack of a surface ship, thereby saving the upper deck space used for separate funnels and the increasingly large tripod masts used to carry heavy radar aerials. The word is a composite (portmanteau
In linguistics, a blend—also known as a blend word, lexical blend, or portmanteau—is a word formed by combining the meanings, and parts of the sounds, of two or more words together.
) of "mast" and "stack". It is a common design feature on post-World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
warship
A warship or combatant ship is a naval ship that is used for naval warfare. Usually they belong to the navy branch of the armed forces of a nation, though they have also been operated by individuals, cooperatives and corporations. As well as b ...
s (e.g. the rebuilt ''Baltimore''-class cruisers) and on some cruise ship
Cruise ships are large passenger ships used mainly for vacationing. Unlike ocean liners, which are used for transport, cruise ships typically embark on round-trip voyages to various ports of call, where passengers may go on Tourism, tours k ...
s.
The French Navy
The French Navy (, , ), informally (, ), is the Navy, maritime arm of the French Armed Forces and one of the four military service branches of History of France, France. It is among the largest and most powerful List of navies, naval forces i ...
(''Marine Nationale'') used a combined exhaust stack and rear director mast on the ''Richelieu''-class battleships in the late 1930s. The Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
used this design feature on the 1944 Weapon-class destroyers and the subsequent ''Daring''-class destroyers, and in the diesel-engined Type 41 "Cat" class and Type 61 "Cathedral" class frigate
A frigate () is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied.
The name frigate in the 17th to early 18th centuries was given to any full-rigged ship built for speed and maneuvera ...
s of the 1950s. It provided unbalanced and unattractive designs, which led to a reversion to separate masts and funnels in subsequent RN vessels.
The close proximity of exhaust fumes to delicate radio and radar equipment led to corrosion
Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engine ...
problems, making macks unpopular for later designs.
References
{{Reflist Shipbuilding