Wally,
What does being incompressible have to do with the situation?
Hydrofoils sure generate lift.
So does the keel of most modern boats, but it is "lift" to weather.
This is why you want to set up a little weather helm so the keel (foil)
has some attack angle.
Matt Colie A.Sloop "Bonne Ide'e"

Wally wrote:

Does the concept of 'lift' apply to the fins or other underwater structure
on a sailboat?

If so, and if water is non-compressible, then what is its effect and how
does it work?


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.