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Originally Posted by FERdeBOER
I'm not saying the sail must be big, I'm saying that is good for stability when navigating. Of course can have cons, everything is good for something and bad for another things.
And, please, what does "Skipjacks were the worst" means? My English is not as good
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He's saying that its the sails that's causing the snap roll effect when turning (the sub turns, and the water pushing on the sail makes the sub roll). From what I read, at higher speeds, the sail also tries to pitch the nose of the sub up and also causes flow irregularities at the aft control surfaces.