The StingRay XRIII hydrofoils are one of the most effective and affordable ways to improve your boat's performance. Their unique design captures the Prop Wash (mass of water) and channels the power for additional thrust. The StingRay hydrofoil reduces bow lift, stops cavitation, and assists in towing a skier. It installs in 5 minutes, easily and without drilling or damaging your engine. Achieve maximum possible speed and enhance your thrust.