I think I
"Get It" now...HOW they do it.
EACH hull (left and right) in this case, has what we all know as a "Daggerboard". Been around for decades. It's usually a straight verticle blade that is inserted down through a hull to prevent lateral (Sideways) movement of the boat as it travels through the water. The "Sunfish" has one. The depth of the insertion can be regulated. The hull currently OUT of the water (multihull) will have it's daggerboard totally retracted (lifted) to eliminate any Drag on that side.
WHAT's NEW: Hydro-Foils.
These daggerboards are Shaped/Curved inward in an ARC...with a slight "Twist" & "Shape" in a hydro-dynamic way.. I believe this curved ARC Daggerboard IS the major
lifting hydro-foil....any thoughts..??
NB
PS: The little "
Moth Foil Sailers" have little
horizontal foils at the bottom of the vertical.."Daggerboard" ....which provide the Lift.