When netting is attached to lines, it should be longer than the lines so as to have a proper looseness.
This excess length is expressed as a percentage of the stretched netting. This is the hanging ratio.
The formula for figuring the hanging ratio is: stretched length of netting minus length of netting, divided by length of netting.
Ratio % = (str length of netting less rope length)/str length of netting)
The shape of mesh is greatly influenced by the hanging ratio.
Multiply the stretch mesh size times the number of mesh deep times the % height to get the total height of net.
Multiply the stretch mesh size times the number of mesh long times the % length to get the total length of net.
The following shows the heights and lengths of the mesh
for different hanging ratios.
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For sports nets such as batting cages and backstops, it is
best if the mesh is close to the same height and length with a ratio of 29.3%.
If possible
hanging ratio should be between 25% and 35%.
Seines are normally hung as close as possible to 1/3
which is a hanging ratio of 33.3%. If possible hanging ratio should be between 20% and 40%.
Gilling type nets are normally
hung between 1/2 and 2/3 which is a hanging ratio of 50% to 66.7%. Generally more is better, but
over 70% will start to become too dark in the water.