Two new designs of Polar pelagic doors are showing promising results, greater spreading force and, equally important, reduced resitance. The new design is similar to the Jupiter and Mars pelagic doors but with double compartment as the doors’ main body to generate greater spreading power.

The design was tested in SINTEF’s flume tank in Hirtshals achieving one of the highest Cl measured, but more importantly, with very low resistance at the desired angle of attack.

Two prototypes of the new design, named Jupiter hydro-wing and Mars hydro-wing to indicate their hydrodynamic design and airwing shape, where built and tested.

A pair of 7.0 square metre Jupiter doors for high speed close to the surface and deeper water fishing in Mauritania, showed almost equal spread compared to Jupiter’s traditional 8.0 square metres doors but with substantially less resitance.

The other prototype, a pair of 12 square metre Mars double doors, is being tested fishing redfish in the Irminger Sea and the first indications are very good, with greater spread than with previous 13.5 squar metres doors, very stable opening of the trawl, quick to put trawl in optimal fishing condition after turning, and easier to haul and shoot.

The new pelagic doors have the same performance characteristics as the sinlge plate doors. The v-shaped Jupiter doors are more suitable for fishing in shallow water and close to the surface while the Mars doors are more suitable for traditional pelagic fishing.

Since the first pairs of Polar pelagic doors where tested at the end of last year, the Mars 9.0 pair on “Rio Caxil” in Spain and the Jupiter 8.0 pair on “Geysir” in Mauritania, more than 20 pairs have been sold with very promising result.

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