No, they do not, they get "bouyancy" from the speed of air around the wings.
bouyancy- force of weight of gas fluids.
Because it contains air bubles to help the kayaker float.
There are four main forces acting on a hot air balloon: gravity pulling it down, buoyancy lifting it up due to the hot air inside the balloon being less dense than the cool air outside, thrust from the burner propelling it forward, and drag from air resistance slowing it down.
Bouyancy determines whether an object sinks or floats.
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The bouyancy of the vessel keeps it afloat. As long as the force of bouyancy is larger then the mass of the ship it will stay afloat.
Its called bouyancy...any object that is sealed off against water is bouyant...because air is light that water and as long as that air is trapped inside and not let to escape it will float
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same as archimedes' principle
An iceburg
bouyancy