"Garland Gray II" wrote in message
...
And it is desirable for the top to fall off some. The wind gradient
results in apparent wind aloft being some degrees more off the bow than
the apparent wind closer to the deck.


These are also one-piece seamless plastic laminated sails, with extremely
little stretch in them. No doubt that helps keep the head under control. I
rather doubt that a similar design would work with dacron.