Sail Profile

The overall profile of the sail is important. While in-boom systems go a long way toward providing a powerful main with sufficient roach to power the boat to windward, it's unwise to attempt to add too much sail area. Ultimately, an even curve from head to clew will provide an even rollup in the boom cavity. Try and stack roach up high in the sail like an America's Cup racer and you will find that the straight leech down low will cause an uneven roll with a lot of fabric bunching up at

The gooseneck and luff feed system on an in-boom furling unit.

The gooseneck and luff feed system on an in-boom furling unit.

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