In musing over it I realized that the height of the sail is almost the same as the width of the football field (160 ft.). The bottom of the sail is 37.5 feet. So if you could take the play the length of the boom you would have a first down.

With the jib and the spinnaker flying you would have about 1/4 the area of the grid of a whole football field. That's a lot of cloth!

Later,
Dan