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For example, dolphins may be seen porpoising away from their main predator, sharks [14] or the direction of incoming boats to avoid collision. [15] Although porpoising is a useful product of rapid swimming, much variation seen in the behaviour cannot be explained by this cause alone; it has likely evolved to provide other functions.
Additionally, civilian vessels produce sonar waves to measure the depth of the body of water in which they are. Similar to the navy, some boats produce waves that attract porpoises, while others may repel them. The problem with the waves that attract is that the animal may be injured or even killed by being hit by the vessel or its propeller. [63]
The block type is the simplest type. The leading end is usually rounded or pointed for reduced drag. "Its main function is to provide additional lift on the back of the hull, mostly during acceleration. It can also help provide better side-to-side stability at speed and reduce porpoising by providing a bit more hull surface at the rear of the ...
“But were just porpoising near it and allowing it to escape for over an hour.” A video shows the massive creatures diving in and out of the water. Some clips show the sea lion swimming below ...
Porpoising (seen in cetaceans, penguins, and pinnipeds) may save energy if they are moving fast. Since drag increases with speed, the work required to swim unit distance is greater at higher speeds, but the work needed to jump unit distance is independent of speed.
The boats also originally carried two water jacketed M2 Browning.50 caliber machine guns, with one mounted on the "cigarette deck" on the aft end of the conning tower fairwater and one on a mount on the main deck forward. These guns were taken below when the boat submerged. [17]
The harbour porpoise (Phocoena phocoena) is one of eight extant species of porpoise.It is one of the smallest species of cetacean.As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar porpoise to whale watchers.
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