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How does a submarines propeller shaft go through the hull and still leave the submarine watertight?
Wiki User
∙ 12y ago
All submarine screw shafts have seals around the full length of the shaft hull penetration area to prevent water coming in. Shaft seals can be mechanical, hydraulic, etc., but regardless they serve the same purpose.
Wiki User
∙ 12y ago
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Why do submarines have propellers?
because if you fart in it it keeps the smell awayAns 2 - propellors give the submarine motion through the water
In which year first submarine was built?
Dutch inventor Cornelis Drebbel built several submersible boats in 1620. They looked like two wooden rowboats fastened on top of each other, the top one upside down, and covered with a waterproof skin of leather. Propelled by oars extended through watertight openings in the skin, historians consider them to be the first maneuverable submarines. American submarines were used during the Revolutionary War (1775-1783) and the American Civil War (1861-1865).
How do submarines see underwater?
On or near the surface, submariners 'see' through a periscope mast raised through the fin above the hull from within the submarine's Control Room. In the very latest submarines, the extendable periscopes will be largely superseded by an electronic mast that uses a camera and displays the picture on a monitor. The optronics masts have a closed circuit television (CCTV) camera to use by day or a thermal imaging (heat seeking) camera for use at night or in bad visibility. Submarines cannot see underwater and so use sound energy to detect obstacles and objects. When under the water the submarine can emit SONAR (SOund Navigation and Ranging) sound waves through the water (know as 'pinging'). The sound wave or sonar ping echo is bounced back to the submarine if it detects another vessel or obstacle. The strength of the returned signal or sound provides an indication of the range (distance) between the submarine and the other vessel (ship or submarine) or obstacle. Modern submarines have excellent radio and satellite reception and communications systems and underwater telephones. When sending out sound waves by sonar, a submarine could be detected by another ship or submarine. When wishing to remain undetected, a submarine will listen for and hear sounds underwater through hydrophones (underwater microphones).
What is the same about a bird and a submarine?
Submarines operate in water much the same as birds or aircraft do in the air. The major difference is that Submarines can't roll over or spin, but pitch, roll and yaw, as on a plane or for a bird, is also applicable to submarine operation. But aside from the mediums they travel in (air vs. water) the principles of movement through those mediums are very similar. In fact, much of submarine control surface technology is based on aircraft wing design, which is based on bird wing design, where the difference in pressure at the trailing edge of the wing causes lift. In a submarine, it uses a screw (Naval term for a propeller) to push it forward, where a bird generates propulsion by flapping its wings. The most obvious similarities are in the control surfaces for both. Birds have wings to change their altitude, and tail feathers for stability. Submarines use Dive Planes, which are designed just like a small wing surface, to control descent and ascent in the water. Trim Planes, which stabilize the submarine's level in the water to a greater degree of accuracy., are like a bird's tail feathers. The other difference is a rudder for a submarine to steer, where a bird alters flight paths by using its wings.
Why do marines use submarines?
Marines of different Nations use submarines for covert operations. It is possible for the marines to exit the Submarine while it is still submerged. This is achieved normally through an escape hatch but some submarines have been converted so several marines can exit at the same time with all there equipment. This usually happens quite close to shore and is a very dangerous proceedure.
How is the thrust force created in a propeller driven plane?
By the propeller, pulling itself through the air.
How can a submarine stay submerged at certain depth underwater?
The military submarines maintain depth by use of the planes. As they move through the water, a little up or down "tilt" on the planes will keep the boat at the correct depth.
The reason submarines can detect other underwater objects is largely due to what?
Submarines use sonar to detect other things in the water. Sonar is an acronym for sound navigation and ranging, but there is a bit more to this. Submarines use what is called active sonar and passive sonar. We need to look at it in a bit of detail to see what's up.Contemporary submarines have a active sonar system aboard. This system emits "pings" into the water, and the pings are bursts of sound energy. The sound energy propagates through the water, bounces off things around the submarine, and then returns to the submarine to be picked up and listened to. By "pinging" on things, the submarine can develop a profile of sorts of things around it. The bottom is down there, and there's another submarine over there. Something like that. But active sonar means you can be heard a long way away. Farther away than you can effectively "see" other submarines with that active sonar. Other submarines can "hear you coming" because you are pinging, and can do this before you can hear then with the returned pings. That's bad for the submarine using active sonar.Modern military submarines operate in water that is fairly deep. This means that the submarines don't generally have to worry about hitting anything under the water. As they on patrol, they are listening for other things in the water using their passive sonar array. This array uses the hydrophones to listen to the sounds in the water. These sounds are being made by other ships, other submarines, schools of fish, whales, or whatever else is making "noise" in the water. This is the primary method used by the current military submarines to locate and track other things in the water with them.
How do guns work on planes without hitting propeller?
Where the gun fires through the propeller, the two are mechanically connected and timed so that the rounds will pass between the blades of the propeller.
Do submarines explore the lithosphere?
No, submarines do not explore the lithosphere. The word lithosphere is roughly equivalent to "rock sphere" and submarines don't move through rock.
What does watertight mean?
Watertight is used to describe something that is closely sealed, fitted, or fastened so no water can get through. It can also be used to describe an argument that cannot be disputed.
Why do US marines?
Marines of different Nations use submarines for covert operations. It is possible for the marines to exit the Submarine while it is still submerged. This is achieved normally through an escape hatch but some submarines have been converted so several marines can exit at the same time with all there equipment. This usually happens quite close to shore and is a very dangerous proceedure.
