[quote=klozhald][quote=MN3]- a new jib creates less disruptive air to the main vs an old jib that will cause disruption to the main ... so even if the main is new, it has already had it's air flow effected[/quote]
+1
Arvel Gentry (among others) estimated that 80% of a sail's power comes from the leeward side, just like an airplane's wing. Having a jib that creates a proper slot to pass wind back to the leeward side of the main is all good.[/quote]
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