I read somewhere that a raindrop is the most perfect aerodynamic shape. And then in an article about raindrops, I found the attached, computer-generated drawing of a virtual raindrop.

It will look very familiar to anybody who has a Hobie bob.

So, IF a raindrop is indeed the most perfect aerodynamic shape, even if a Hobie bob doesn't provide any lift, at least it seems that it would present the least possible amount of drag.