Originally Posted by sailnw777
but something doesn't seem right. spinnaker measurements are slightly bigger than genoa but area is 2.5 times larger.
The genny and the spinnaker are not right triangles.
The spinnaker is cut very wide all the way to the shoulder and then comes in sharply at the head
. The sail is also cut deep.
The genny has a much more acute angle formed at the head
where the leech and luff meet so has a much higher aspect ratio and on average a narrower width from luff to leech.
If you divide the square area by the luff length you can approximate the average width.
35 / 13.7 = 2.55
93 / 13.2 = 7.0
Seems pretty approximate to me.