Category: Tips
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Downriggers and Depth Finders
Here are some thoughts on the geometry of downrigger lines and 2-D sonar displays. This example is based on the data from the previous post “Trolling Angles with Downriggers“. Transponders The transponder is below the surface, in this example by 2 feet. The green area shows the effective span of the transponder’s signal cone. A…
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Trolling Angles with Downriggers
When trolling with downriggers, compared to long-line trolling, you may think you understand how deep your lure is, but you may be wrong. The rigger has a line counter, and the line is somewhat vertical. The trolling rigs behind the cannonball may be short enough or neutral enough that one does not need to take…
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Line Angles are Not Dependent on Depth
Claim The angle of a trolled fishing line at a given point, measured at the surface, does not change as more line is deployed and the rig is lowered into the water. Forces The forces acting on a trolled line are characterized as weight, hydrodynamic drag and hydrodynamic lift of both the terminal tackle and…
