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NET MOUTH INCLINATION KEEPING TYPE TRAWL NET FISHERY SYSTEM

Foreign code F120006909
File No. S2006-0797-C0
Posted date Oct 9, 2012
Country WIPO
International application number 2007JP057138
International publication number WO 2008/029533
Date of international filing Mar 30, 2007
Date of international publication Mar 13, 2008
Priority data
  • P2006-241951 (Sep 6, 2006) JP
Title NET MOUTH INCLINATION KEEPING TYPE TRAWL NET FISHERY SYSTEM
Abstract

Provided is a net mouth inclination type trawl net fishery system for controlling a posture autonomously. The trawl net fishery system comprises a trawl net including a body portion of a quadrangular pyramid shape formed of an upper net, a lower net and a pair of side nets, and a cot end portion connected to the leading end of the quadrangular pyramid shape. In the trawl net, the side net of the body portion has a longer side and a shorter side as its upper and lower sides, and the sides forming the net mouth edges such an inclination angle (?) of the side net front edge with respect to the bottom side of the a isosceles trapezoid having a shorter leg as the shorter side as satisfies the relation of the following Formula (1), so that the front edge of the net mouth is enabled to keep an inclination angle (ss) autonomously by the resistance and lift of a water flow with respect to the net: (y1CD?1 - x1CL?1)S1 + (y2CD?2 + x2CL?2)S2 + 2ySCD?SSS + 2awfsinss/(?aV<2>) = 0 - - - (1).

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY,
  • HU, FUXIANG,
  • TOKAI, TADASHI,
  • SHIODE, DAISUKE,
  • OZEKI, YOSHIOKI,
  • KUBOTA, HIROSHI
  • Inventor
  • HU, FUXIANG,
  • TOKAI, TADASHI,
  • SHIODE, DAISUKE,
  • OZEKI, YOSHIOKI,
  • KUBOTA, HIROSHI
IPC(International Patent Classification)

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