As I watched the last 30 seconds of that A cat video, it showed me exactly why I don't want to foil! Up down, Up down, you are basically riding a teeter-totter, and he was in flat, smooth water. Now, imagine trying to ride that hobby horse in some waves!

The previous video, with the Phantom, also shot while sailing on flat water, but obviously it has some type of foil on the rudders that is helping both to lift and stabilize the boat. I think that is the biggest problem to overcome, trying to keep the boat stable, up on the foils, while also going up and down over waves.

The C class Cats tried it a long time ago, and finally abandonded it, I thought because it was only faster when going downwind, not upwind?

So, if we are going to go down the Foiling road, we may need to change our race course layout to more reaching/downwind.