Join Date: Nov 2007
Location: SF Bay area
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If a big (half your boat length or higher), steep, breaking wave hits you broadside or from the quarter, it really could care less whether the water next to your boat is slick or rough.
Possibly the sea anchor the Pardy's use would keep the boat in position relative to the waves. The slick produced would keep most waves from breaking through your windward portlights.
IIRC, the Pardeys admit the possibility that a wave could come from an unexpected direction and break on them, and that that would be bad. I think the idea is that most breaking waves that are dangerous will be approaching from windward.
s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27