The cunningham tightens the luff of a mainsail. In other words the forward part of the sail that is connected to the mast. There are many different ways to set this up. Here is what our setup looks like on Paikea
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Flying the Code 0 and Staysail plus full main on our way past Sardinia.
This is the Gunboat 6602 SV Outnumbered doing windspeed in light airs.
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a glimpse of the Gunboat66 forward cockpit in action as we punch into the waves upwind