Sail of the French nuclear submarine Casabianca; note the diving planes, camouflaged masts, periscope, electronic warfare masts, door and windows.

In naval parlance, the sail (American usage) or fin (British/Commonwealth usage) (also known as a fairwater) of a submarine is the tower-like structure found on the dorsal (topside) surface of submarines. Submarine sails once housed the conning tower (command and communications data center), and continue to house the periscope(s), radar and communications masts (antenna).[1] When above the water's surface, the sail serves as an observation platform. It also provides an entrance and exit point on the submarine that has enough freeboard to prevent the submarine being swamped. Under water, the sail acts as a vertical stabilizer. In some submarines, the sail also supports diving planes (or fairwater planes), which are control surfaces used for underwater stability and steering.[1][2]

See also

References

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  1. 1 2 Office of Naval Research. Submarines - How They Work Archived 2009-01-22 at the Wayback Machine. Retrieved December 24, 2008.
  2. ↑ "Jackspeak of the Royal Canadian Navy". ReadyAyeReady.com. Retrieved 19 September 2020.
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