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The otter may have multiple different designs. Otter boards used in bottom trawling are based on a similar design principle. The design takes advantage of the shearing effect achieved when the board is positioned at an oblique angle to the current. The effect is reminiscent of that of a kite in the wind. [2] [1] Different designs are found in ...
Pelagic (midwater) otter trawl. 1: trawl warp, 2: otter boards, 3: longline chains, 4 hunter, 5: weights 6: headline with floats, 7: pre-net, 8: tunnel and belly, 9: codend. The body of the trawl is funnel-like, wide at its "mouth" and narrowing towards the cod end, and usually is fitted with wings of netting on both sides of the mouth.
Some otter trawlers are also outrigger trawlers (above), using outriggers to tow one or two otter trawls from each side. [22] Usually otter trawlers have the superstructure forward, though it can be aft or amidship. Gallows are on the stern quarters or there is a stern gantry for operating the otter boards.
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[11] [12] Paravanes and otter boards operate underwater on an analogous principle. Man-lifting kites were made for reconnaissance, entertainment and during development of the first practical aircraft, the biplane. Kites have a long and varied history and many different types are flown individually and at festivals worldwide.
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