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Originally Posted by BROJD
4) Related question -- does using full rudder at all affect my acoustic signature? Or does it just slow me down when I'm trying to sneak away?
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It slows you down considerably -- by a knot or more if you are running 2-3 knots. And that tempts you to rev it up a bit, which is when they find you (they go after RPMs, not speed).
10 degree rudder is the most I use unless I simply must present a better profile.
Full rudder doesn't affect your signature; that's all angle and depth.