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Old 12-26-2018, 08:11 PM   #4
Rain Dog
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City: Pensacola, FL
Country: United States
Vessel Name: Rain Dog
Vessel Model: Grand Banks 42 Classic
Join Date: Feb 2016
Posts: 184
Most sails are "wings" not "kites", so to be effective the sideways force they exert on the boat must be counteracted by an underwater appendage (keel or centerboard) that generates lift, or form stability (flat wide hull). Adding a sail like this to a trawler is a bad idea without substantial modifications to the boat.

A "kite" sail, like a traditional symmetric spinnaker, should be fine to use on a trawler in light winds as far as the hull is concerned. However, a sail like this puts extreme loads on the "rigging", of which a trawler has none. Adding rigging to handle a sail like this is probably extremely expensive, but your local rigger could give you a price quote. Any competent rigger should be able to make the modifications.
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