Instruction manual
3
857-164777 / A
3 ITI GEOMETRY FOR TWIN RIG
Setting up a three wire Twin Rig system isa question of finding the
balance point between a number of forces. The adjustment of the
centre warp is very critical. This is one of the reason for the
positioning of the clump, and hence the balance of forces between
the doors and the warp and sweeps being so critical to get a square
tow.
•
The ITI Geometry System provides the skipper with crucial
information to adjust the Twin Rig correctly and henceoptimise
the efficiency of both trawls during the tow.
The ITI Geometry System is based on measurements of the
distance from the vessel to both trawl doors and to the clump. In
addition, the distances between each door and the clump are
measured based on transponders attached to the clump. Based on
these range measurements, the geometry of the Twin Rig is
calculated with high accuracy since all measurements are relative
to each other.
1.3
30
28
310
307
309
(Cd6891)
The clump position relative to a straightline betweenthe doorswill
affect the geometry of the trawl. To get a square tow, the deviation
from the straight line position should be close to zero.
This is a focus point for the ITI Geometry System. In addition, the
angle between the true course over ground (VTG) and the straight
line between the doors are calculated and displayed.
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