Otter board

A - Human Necessities – 01 – K

Patent

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Details

A01K 73/045 (2006.01)

Patent

CA 2251079

The invention relates to an otter board (20) which may be used for generating a spreading force in connection with trawl fishing. The otter board according to the invention comprises at least two foils (1-3) which are suspended between a number of longitudinally extending ribs (5, 6, 10, 17, 26, 27) in such a way that at least one tapered channel is formed in which the flow of water is passing through the otter board. The channels are curved and formed so that water is ejected at a high speed in relation to the towing speed in a direction slightly downwards and along a respective end section of an adjacent lower or intermediate foil extending from the outlets of the channels, whereby turbulence is prevented from occurring even at high angles of attack of the otter board.

L'invention concerne un panneau de chalut (20), utile pour produire une force d'ouverture du chalut, en liaison avec le remorquage de celui-ci. Ce panneau comprend au moins deux feuilles métalliques (1-3) suspendues entre un certain nombre de nervures (5, 6, 10, 17, 26, 27) s'étendant longitudinalement, de façon à former au moins une voie d'écoulement rétrécie permettant au flux d'eau de traverser ledit panneau. Les voies d'écoulement du panneau sont courbes et formées de manière que l'eau soit éjectée à grande vitesse, par rapport à la vitesse de chalutage, et ce légèrement vers le bas et le long d'une section d'extrémité respective d'une feuille métallique adjacente, inférieure ou intermédiaire, s'étendant à partir des sorties des voies d'écoulement, empêchant ainsi la formation de turbulences, même lorsque les angles d'attaque du panneau sont importants.

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