Imitating the octopus propulsion system
The Fraunhofer Institute in Germany has analysed the pulp propulsion system in order to imitate them. Octopuses move for most of the time at the bottom of the sea and when they are in danger they set up a special propulsion system. Through it, they quickly absorb a lot of water through a tube that's under the skin, and this water is thrown almost instantly by a hole that they have in their abdomen. Through this system they achieve a very high speed and are also capable of evacuating the water in the desired direction and, therefore, of moving it to where they want.
At the Fraunhofer Institute they have imitated the movement of octopuses with a diameter of 20 centimeters and a length of four centimeters, placing a piston with a plunger at four balloons. The whole system has been created through a 3D printer which, according to the researchers, has many advantages over conventional ones. On the one hand, having no propellers, it does not harm the marine fauna so much and, on the other, it generates less pollution.
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