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Light mold otter trawl for high-rate trawling that features high hydrodynamic efficiency, methods of its production and application. RU patent 2346433.

FIELD: mechanics.

SUBSTANCE: proposed otter trawl incorporates one or two slats arranged with their front edges in compliance with the position of the front edge of one primary deflector that features a shape wherein the said deflector outer side surface has larger curvature than the inner side surface. The said deflector profile thickest part is arranged ahead of the center. The outer side surface is bulged while the inner side one is concave. The proposed otter trawl is made from synthetic material containing a polymer material mixed with elastomer. The said otter trawl synthetic part takes up whatever impacts without damages.

EFFECT: light-weight, high-strength design of otter trawl along with ease of manufacture and use.

58 cl, 5 dwg

IPC classes for russian patent Light mold otter trawl for high-rate trawling that features high hydrodynamic efficiency, methods of its production and application. RU patent 2346433. (RU 2346433):

A01K73/045 -

Another patents in same IPC classes:

Trawl otter board / 2323572
Trawl board has two interconnected trapezoidal profiled bearing shields, equipped with stringers, slats, ballast, devices for fixing cables and warp. Bearing shields are installed with possibility of rotation around one axis. Each shield is equipped with middle stringer mounted at an angle with shield. Stringers have opposed pockets where elastic elements limiting the angle of rotation of shields are installed. Middle stringers are equipped with flaps.

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.

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.

Light mold otter trawl for high-rate trawling that features high hydrodynamic efficiency, methods of its production and application / 2346433
Proposed otter trawl incorporates one or two slats arranged with their front edges in compliance with the position of the front edge of one primary deflector that features a shape wherein the said deflector outer side surface has larger curvature than the inner side surface. The said deflector profile thickest part is arranged ahead of the center. The outer side surface is bulged while the inner side one is concave. The proposed otter trawl is made from synthetic material containing a polymer material mixed with elastomer. The said otter trawl synthetic part takes up whatever impacts without damages.

Trawl toggle / 2432739
Proposed device comprises set of bent plates, lengthwise stringers oriented in parallel to make toggle rigid, upper and lower washers confining said plates, ballast, trawl gallow, and trawl cable ropes fastening rakes. Trawl gallow is arranged on toggle horizontal axis and secured in central stringers. Trawl gallow, central stringers and rakes allow adjusting trawl toggle to angle of attack, heel and pitch. Plates are oriented and fastened so that their front edges, in cross section, are located along arc. Every plate is bent in direction of trawl toggle travel. Plate rear edge is arranged with clearance to next plate.

Construction of allopelagic trawl board of improved efficiency, obtained using materials and methods of universal accessibility / 2501214
Trawl board has front and rear edges, at least one main deflector housing and at least one slat. At least a part of the trawl board has a profile in which at least one slat has a front edge located in front of the rear edge of at least one main deflector housing. In the first version, at least one slat is located at an internal angle formed by converging of the first imaginary straight line connecting the shortest distance between the front and the rear edges, at least one slat and the second imaginary straight line connecting the front and the rear edges selected from the group consisting of front and rear edges, at least one main deflector housing, and the front and the rear edges of the trawl board. In the second version, each of at least two slats is located at an internal angle formed by converging of the first imaginary straight line connecting the shortest distance between the front and the rear edges of each of at least two slats, and the second imaginary straight line connecting the front and the rear edges selected from the group consisting of the edges of one main deflector housing and the edge of the trawl board.