Texas Goose - Semi Foiling in low wind

Light wind, but enough to take a look at any gains from the foils, while not completely flying the hull. There is a transition from static buoyancy (displacement) to dynamic buoyancy (planing/foils) as speed increases. The drag cost goes down as the weight shifts to the more efficient lift of the foils and less hull is pushed through the water. It seems clear that a speed advantage exists as low as 2-3kts when compared to a Goose with no foils.

It's not necessary to fly the hull to have a net gain from foils. In addition, if the foils are arranged outboard, the increasing dynamic lift is also moving the center of lift to leeward, increasing stability. More stability with no drag penalty.