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Otter board (versions). RU patent 2292713.

FIELD: commercial fishery technique.

SUBSTANCE: otter board has lower wing, upper wing and at least one intermediate wing, said wings being curved in direction of advancement of otter board in water so as to define channels therebetween, parallel longitudinal fins and keel. Wings are made of different length and are stepped one above another with different gaps therebetween so as to define V-shaped profile relative to central longitudinal fin. Wings have aerodynamic profile with maximum profile of upper wing making 18% of wing length, and wing length to wing width ratio constituting from about 1:1.3 to about 1:1.4. Angle of V-shaped profile is 155 deg. Fins have unequal arms. Wing front edges are reinforced with stringers. At least one additional guiding and stabilizing fin is provided along the entire length of otter board wings and four additional guiding and stabilizing fins are provided along the entire length of otter board.

EFFECT: increased efficiency, enhanced reliability in operation and reduced consumption of power by increased thrust force, reduced draft, increased vertical stability of otter board at any fish catching depth and substantial angles of attack, and wide range of trawling velocity, reduced overturning tendency and decreased linear sizes of otter board.

8 cl, 4 dwg

IPC classes for russian patent Otter board (versions). RU patent 2292713. (RU 2292713):

A01K73/045 -

Another patents in same IPC classes:

Otter trawl board / 2267271
Otter trawl board has profiled carrier plate, slats, upper and lower washers, ballast adapted for imparting stable position to otter board during trawling and positioned in lower part of otter board, stringers for imparting desirable rigidity to otter board, central stringers for securing of otter trawl board arch, combs for attachment of trawl cables, and wire. Otter trawl board arch is arranged symmetrically to axis of plate and slats. Wire attachment device is positioned on horizontal axis of symmetry of plate and slats. Trawl upper cable is fixed to comb, in the vicinity of upper washer of otter board, and lower cable is fixed to comb in the vicinity of lower washer. Carrier plate and slats are curved along chain line described by formula where , To is horizontal thread tension component; q is weight of 1 running meter of thread, and curvature of slats is identical to that of carrier plate. Combs, central stringers and trawl board arch are equipped with openings for adjustment of otter trawl board in accordance with angle of attack, heeling and trim.

Otter board (versions) / 2292713
Otter board has lower wing, upper wing and at least one intermediate wing, said wings being curved in direction of advancement of otter board in water so as to define channels therebetween, parallel longitudinal fins and keel. Wings are made of different length and are stepped one above another with different gaps therebetween so as to define V-shaped profile relative to central longitudinal fin. Wings have aerodynamic profile with maximum profile of upper wing making 18% of wing length, and wing length to wing width ratio constituting from about 1:1.3 to about 1:1.4. Angle of V-shaped profile is 155 deg. Fins have unequal arms. Wing front edges are reinforced with stringers. At least one additional guiding and stabilizing fin is provided along the entire length of otter board wings and four additional guiding and stabilizing fins are provided along the entire length of otter board.

Trawl otter board / 2323572
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Light mold otter trawl for high-rate trawling that features high hydrodynamic efficiency, methods of its production and application / 2346433
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