The Profile View (Elliptical Shape)Instead of a straight triangle or a blocky rectangle, your fin profile must look like a smooth, teardrop curve.The Base (Root Chord): Keep your 8 cm length glued flat against the bottle body.The Height (Span): Keep your 12 cm length extending straight outward.The Curve: Curve the front edge upward smoothly toward the tip.The Tip: Round off the outer tip cleanly rather than leaving a sharp point.The Trailing Edge: Curve the rear edge back down toward the bottle base.Why it wins: An elliptical curve produces the lowest possible induced drag. It prevents energy-robbing vortex swirls from forming at the fin tips. Mehr sehen