> Water on the wave face moves up the wave. When your boat is parallel to
> the wave on the wave face, a rudder or skeg is sticking down into this
> upward moving water while the boat is trying to move down the wave. This
> will have two possible effects, it may steer you back towards
> perpendicular to the wave (good), or it will try to flip the boat over as
> the skeg tries to move up with the water and your head tries to move down
> with gravity (bad).

That makes sense to me now. Thanks. I know there are many things that could affect this, but what size waves are we talking about? Is it possible/probable that the 1- 2' wind driven river waves I've encountered could cause this? Or is this an ocean/great lake size wave we're talking about?

Woody