Naked Viking Surf: Peregrine (Large) - Apex (Single Tab) with Center Option A The Peregrine Thrusters are our version of the K2.1/WCT templates. We made some modifications to the outline to increase maneuverability, and improved foiling to create a higher performance setup. DETAILS: Side Base : 4.50 inch Height : 4.70 inch Area : 15.82 Sweep : 32.7 Degree Foil : Flat SeriesIII Center (Option A) Base : 4.37 inch Height : 4.47 inch Area : 14.43 sq inch Sweep : 31.9 Degrees Foil : 50/50 SeriesIII