Cut Quad 
The majority of the fin sits deep in the water, creating lift and acceleration. In combination with the flat foil front and rear fins, the cut-away base allows for quick direction changes, and maneuverability. 
 
Front
Height:    4.71"
Base:        3.59"
Area:        15.05
Foil:           Flat
 
Rear
Height:    4.24"
Base:        3.59"
Area:        15.05
Foil:           Flat