What happens when water gets into a submarine?

A submarine or a ship can float because the weight of water that it displaces is equal to the weight of the ship. This displacement of water creates an upward force called the buoyant force and acts opposite to gravity, which would pull the ship down.

How far could a submarine see through periscope?

At sea this is around 11 to 12 miles. If a target is near the horizon then you may be able to see masts or superstructure through the periscope. Modern submarines do not use traditional optical periscopes but optronic masts that employ a range of sensors including a camera and infra red sensor.

Why do submarines smell bad?

The chemical that cleans CO2 from submarine air leaves it smelling awful. This chemical, called amine, is known by every submariner (I was one for 3 years), as well as every submariner’s wife, husband, or anyone else who encounters that sailor’s laundry.

How does a submarine navigate underwater?

Submarines carry an inertial navigation system (INS), which measures the boat’s motion and constantly updates position. Because it does not rely on radio signals or celestial sightings, it allows the submarine to navigate while remaining hidden under the surface.

How does a periscope work on a submarine?

Submarines have periscopes so that people inside can what is on the surface of the water. In a periscope, light from an object strikes the top mirror at 45° and bounces off at the same angle. This sends light directly down the tube and onto the lower mirror.

How deep is a submarine at periscope depth?

approximately 60 feet
For a sub to receive these radio-frequency or satellite messages, it must stop what it is doing within that time period, extend an antenna and rise to “periscope depth”— approximately 60 feet (18 meters) below the surface, which is shallow enough to use a periscope.

What depth is periscope depth?

Whilst there are tactical advantages of operating deep (particularly to remain covert), periodically submarines are required to return to periscope depth, which is approximately 20 m from the surface (Bateman 2011).

What is the function of a periscope on a submarine?

of a periscope is to give an officer conning a submarine a view of the surrounding horizon while his vessel remains submerged. To accomplish this, it is necessary that the periscope be long enough to extend beyond the surface, and that

What is the seal around the propeller shaft of a submarine?

The seal around the propeller shaft of a military submarine is a double seal consisting of a labyrinth seal and an inflatable boot.

How does a labyrinth seal work on a submarine?

Because the Labyrinth Seal only reduces pressure from the ocean, the submarine needs one more seal to ensure there is no flooding into crew spaces. By inflating a rubber boot around the shaft, it provides the secondary barrier to prevent flooding from oceanic water pressure.

Why are periscopes made in the form of a long narrow tube?

In addition, the part of the periscope which is to be above water must be as inconspicuous and streamlined as possible; for this reason the periscope is made in the form of a long narrow tube. 1A3. Periscope nomenclature.