[quote=Dogboy]What you've shown (double block on the tack) would be a 4:1 purchase. This is OK on the 18 and was the max that was allowd by the class rules for many years. The class rules now allow up to 8:1 purchase and allow two exit blocks so the downhaul can be trimmed from the side of the boat while under way. For casual sailors it is probably overkill, but for more serious sailors and racers, it is definitely a noticable improvement.
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