Weight of the ship afloat and maintain power equal to each other, so different weight of the ship called the displacement (weight tonnage).
Surface displacement submarine will be the smallest since the ballast tanks are exempt from the water. Submerged displacement submarine maximum, as a boat loaded with extra ballast. Reserve buoyancy of the submarine is the difference between the underwater and surface displacement.

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The buoyancy of submarines, it has the ability to keep them on the surface at a given deepening shtevney, to characterize the reserve buoyancy. When submerged displacement boats by increasing water intake into the body in a special ballast tanks. Filled with ballast tanks of reserve buoyancy is reduced to zero and can be negative. List or trim (transverse or longitudinal inclination) boat will always appear,
when the center of gravity and center of buoyancy will not be placed on the same vertical.

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The only way to change their relative position is to change the center of gravity. Pumping water from one tank to another to seek to eliminate unwanted heel or trim. Stability, i.e. the ability of the vessel to return to the upright position after the termination of the heeling force, can be characterized by restoring torque. The greater the righting moment occurs when you list or trim, the greater stability of the boat.
Progress in the boat on the surface normally provides an internal combustion engine (such as diesel). Underwater turn provide electric motors. Speed ​​is measured in knots. For uniform motion of the boat engine power is consumed to overcome the resistance.
Submarine main form of resistance, resistance to viscous friction forces that occur between the moving body and the adjacent layers of fluid. A lower value for the submarine has a wave impedance and eddy resistance.