Christian Gerzner wrote:

> True, providing (as I qualified) you have a point in the distance to
> guide you. Otherwise, no matter how well you might think you
> compensate for the "twist", there is nothing there to advise you as to
> whether you are over - or under - compensating.

The same is true for any swimming underwater.  Unless you have a reference,
you don't know if you're swimming in a straight line or not.  A stronger
leg, a slightly asymetrical set of fins, a fin that's on your foot just a
bit differently on one side than the other, are all things that happen all
the time, all things that will result in something other than balanced
thrust and all things that we all adjust for on every dive.

My only point is that a diver with one fin can use one fin without swimming
in circles.

Lee