The word derives from Latin. “Sub” meaning below or beneath and “Mare” (pronounced “mahray”) meaning the ocean. A submarine is therefore an object that goes under the sea, and in practical terms since objects that go to sea at all are boats, a submarine is a boat that goes under the sea.Similarly one may ask, why do submarines have a sail?
The main reason that submarines have sails is to protect the assorted masts and periscopes that protrude through the hull. Typically there are two periscopes, a radar mast with rotating antenna at top, different communications masts and antennas, electronic countermeasures and snorkel mast.
Additionally, where do we use submarines mostly? Submarines are also used for a variety of functions in the private sector. The most common are scientific submarines, which explore the world's oceans to further research and to locate sunken ships.
Similarly, you may ask, what is a Fairwater on a submarine?
In naval parlance, the sail (American usage) or fin (European/Commonwealth usage) of a submarine is the tower-like structure found on the dorsal (topside) surface of submarines. In the US Navy, the structure is frequently called a fairwater, and diving planes mounted on it are called fairwater planes.
What is a submarine used for?
In the military submarines are used for protecting aircraft carriers on the surface of the water, attacking other submarines and watercraft, as supply vessels for other subs, launching torpedoes and missiles at land and sea targets, and for providing surveillance and protection from would-be attackers.
How do submarines get air?
Oxygen is supplied either from pressurized tanks, an oxygen generator (which can form oxygen from the electrolysis of water) or some sort of "oxygen canister" that releases oxygen by a very hot chemical reaction. The carbon dioxide is trapped in the soda lime by a chemical reaction and removed from the air.How deep can military submarines go?
As a result, the submarines are capable of diving to depths of up to two thousand feet, and crush depth estimates run from 2,400 to 3,000 feet. At 353 feet, Seawolf subs were designed to be slightly shorter than their predecessors, by just seven feet, but with a twenty percent wider beam, making them forty feet wide.Can I buy a submarine?
Yes. Several businesses in the United States and Europe cater to the recreational submariner. Around $600,000 will get you an entry-level, winged submersible without a pressurized cabin. Those who want to dive in high style can purchase a ritzy, 5,000-square-foot submarine with a living and dining area for $80 million.Do submarines have windows?
No, Navy submarines don't have windows or portholes so the crew can watch undersea life. Submarines have only periscopes for outside vision, and those are only used close to the surface, a periscope depth (PD).What is the largest submarine in the world?
Typhoon
What is the best shape for a submarine?
The most ideal shape of a submarine hull for minimum drag is the idea streamlined shape with a parabolic bow and an elliptical stern, as shown in Figure 10.How do submarines deal with pressure?
When they are filled with air, the submarine rises to the surface; with water inside the tanks, the sub sinks towards the seabed. By changing the amount of water or air in the tanks, the submarine alters its buoyancy so it can move close to the surface or deeper down.What do you call the captain of a submarine?
Adding to the confusion, all commanding officers of commissioned U.S. Navy warships and submarines (e.g., USS or "United States Ship") are called "captain" regardless of actual rank.What is a group of submarines called?
A flotilla is usually composed of a homogeneous group of the same class of warship, such as frigates, destroyers, torpedo boats, submarines, gunboats, or minesweepers.Do submarines hit things?
Most subs have two types of sonar: active and passive. If the ping bounces back, that means it hit an object—like a whale, a ship, or another submarine. But stealth subs often avoid active sonar, since the ping could give away their location. Instead, they use passive sonar, which merely detects sounds.What is it called when a submarine goes down?
For general submersion or surfacing, submarines use the forward and aft tanks, called Main Ballast Tanks (MBT), which are filled with water to submerge or with air to surface. A submerged submarine is in an unstable equilibrium, having a tendency to either sink or float to the surface.Do submarines have wheels?
At the time, the NR-1 was the Navy's largest deep-sea research submarine and its smallest nuclear sub. But most importantly, the NR-1 had retractable wheels and portals. The wheels allowed the NR-1 to roll along the seafloor.What does I've got the con mean?
When someone assumes the con it means that they are in charge of the ship handling only! Please note that the officer having the Conn unless it is the CO does not have any other control of the ship while having the conn. He/she can not order weapons to be fired for example.Are submarines neutrally buoyant?
But all submarines in submerged condition operate on a condition that lies between the above two, such that the weight and buoyancy are always equal. The submarine, in this condition, is called Neutrally Buoyant. In other words, the metacentre of a submerged submarine coincides with the centre of buoyancy.How fast can submarines turn?
At a speed of 24 knots, a little more than 27 mph, the submarine makes a fast turn to the right, then to the left while those on board not accustomed to the maneuver hold on.Do submarines shrink?
As a submarine increases its depth the increasing hydrostatic pressure increases the stress on the hull. This stress then strains the hull. The hull shrinks. So the submerged volume of a submarine decreases with depth which in turn reduces its buoyant force.Which country has the best submarines?
As Popular Science pointed out, France is one of only four nations on Earth with the capability to build, arm and launch a submarine. The other three are China, Russia and the United States. 
