Hydrofoil trawl door

Details Hydrofoil trawl door Hydrofoil trawl door

1977-08-29

1980-01-01

Smith, James G.

Fishing, trapping, and vermin destroying

Fishing

Nets

A01K 7302

Patent

active

041809351

ABSTRACT:
A hydrodynamically superior trawl door with increased efficiency in harvesting fish and reducing fuel expenditures is composed of curved steel panels, which may be of constant radius to allow for economy in manufacturing. The door approximates an ideal hydrofoil surface, presenting a streamlined surface to the flow of water and a relatively sharp hydrodynamic trailing edge, and allowing for a moderate angle of attack and a high lift coefficient. The door is hollow and may be airtight and contains a flood opening with a baffle to allow air to be trapped inside to provide, even when hydrostatically compressed, some measure of vertical stablity. Further, the water ballast is automatically jetisoned during hauling in. The bottom of the door is curved to allow easy clearance of seafloor obstructions.

REFERENCES:
patent: 3281980 (1966-11-01), Luketa
patent: 4028840 (1977-06-01), Wille

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