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Porpoising, also known as running, [11] is a high speed surface behaviour of small cetaceans where long jumps are alternated with swimming close to the surface. Despite the name, porpoising behaviour is seen in dolphins and porpoises, as well as other marine species such as penguins [12] and pinnipeds. [13]
In aviation, a bounced landing is a behavior of an aircraft that can develop after aircraft touching the runway or water surface, and defined as all aircraft wheels or floats briefly and sometimes repeatedly losing contact with the runway or water surface during landing.
Porpoising is high-speed swimming close to water surface with many leaving and re-entering the water nose-first. Dolphin, Penguin, and Seal porpoise in the wild. Dolphin saves energy at high speed porpoising. [7] [8] Penguin porpoises in group for long-distance traveling. [9] Seal porpoises as group play [10]
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The port bow plane of the Soviet-era submarine B-39. Diving planes, also known as hydroplanes, are control surfaces found on a submarine which allow the vessel to pitch its bow and stern up or down to assist in the process of submerging or surfacing the boat, as well as controlling depth when submerged.
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Also important is how quickly the ship will respond to rudder motions with roll motions (quick is better) and rate of turn (slow is better). Despite the high costs of high-quality steering gear and strengthening of the ship's stern, this stabilisation option offers better economics than stabiliser fins.
They also suffered from chronic "porpoising" as the cars got into a pendulum-like cycle of gaining and losing downforce, that was both dangerous and detrimental to shaking the drivers and engine to bits. [40] [23] They qualified a woeful 32nd (3:34.1) and 40th (3:40.1). [39] WM also had a terrible qualifying.