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The fins help steer the submarine; making it be able to turn left or right.
fairwater planes
It doesn't need fins to move forwards, but fins are used to control rolling from side to side
Stabilising fins prevent a side to side rolling motion.
what does the term stabilizing fin mean
They are actually called "planes" on a submarine and allow it to maneuver underwater. Horizontal "planes" allow the submarine to go up/down, vertical "planes" allow the submarine to go left/right.
A submarine can submerge by filling ballast and trimmer tanks with sea water. The additional weight will take the submarine down. To resurface, the submarine will blow the sea water out of the tanks using compressed air. The air in the tanks make the submarine buoyant, so it rises and floats on the surface. Though a stationary submarine can submerge in this way, it usually submerges going forward and using diving plane (fins) to steepen the dive, so getting under the surface faster.
Whitebait is a type of fish so it would have fins.
Fish use their fins for propulsion (to push them along in the water) and like boat rudders to guide their movement. Also, many fins are bony and sharp and provide a degree of defense against predators.
it has fins
They'll ether drown or grow fins.
Fins up would be evät pystyyn in Finnish.