[quote=DamonLinkous][quote=bruiser] the assumption I had, was you are taking sail away from the back half of the sail and moving sail area up to the top to get a more uniform wing from top to bottom with the result being a higher aspect shape than what you get from a pin head main. This result is more pressure forward rather than sideway for a faster sail.[/quote]
That is how the Squaretop main I have from EP is done, the total size (SqFt) of the main is virtually the same as stock (less than 5% difference) even though it has a pretty large 53 inch top.
Most stock beachcat sails (on the older design boats) have a large roach (curve on the back) of the main so there is plenty of material that can be relocated to the top.
If you entering races using the Portsmouth ratings the penalty for a Non-Standard (within 5% area) main is only .995 but an oversize main is much more (can't locate the ratings on [url=http://www.ussailing.org/]http://www.ussailing.org/[/url] right now)
So if you have one custom made be sure and specify to the sailmaker to keep the sq.ft. close.[/quote]
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