Armstrong DWP Downwind Foil WingDWP Development of the Downwind Performance foil began by collecting waveform and real world riding data from Hawaii's interisland channels to set specific performance parameters for the design process. A team of leading fluid dynamics experts optimized a foil shape with extreme top end glide at high speeds, but with enough low end lift to still make average conditions accessible. The result is a very high aspect ratio outline with swept wingtips and