ASA and PSIA Instructor
Join Date: Apr 2000
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I don't think there be any performance benefit from an inner jib, probably the reverse is more likely. First, the sail couldn't be too large, consider the shorter I and J measurements you start with on an inner forestay, and secondly that sail would more likely mess up the existing airflow in the slot more than it would contribute drive. This is just my opinion, but consider that you don't see double headsails used in ultimate performance configurations where the boat is not constrained by rating or rule. You do see double headsails being used on some offshore racing boats, but I've always thought that more due to the advantages of easily adjusting area by furling/dropping one or the other than by the pure advantage of two used together.
I'd think the best you could do to improve upwind performance in light air is run a high performance 150% (or get a bigger stick).
Last edited by sailingfool; 10-31-2006 at 11:22 AM.