Nav wrote:
If set up with dihedral or when heeled, yes they can -but its small as
their area is small.

I'm not saying you're wrong, but the wing keel designers I've talked
with have never mentioned it. First of all the winglet is mostly
horizontal. Here is where Jax's favorite, the 'sine function' comes
in... if the winglets produce a net lift, then it is going to be mostly
up or down unless the dihedral and/or heel angle gets very large, like
greater than 45 degrees.

When you get done emailing Phil Bolger and the SAYRA race officials, you
can email Evan Gatehouse, Stephen Baker, and Paul Kamen to ask them
about it. They all hang out on other sailing forums and are quite
knowledgable about this sort of thing.

Of course, one of the most important functions of a wing keel, which you
forgot to mention, is that it gets more ballast weight down low. A model
airplane designer would not be concerned with that, though

Fresh Breezes- Doug King