Davis® Whale Tail XL Hydrofoil Stabilizer.
Works wonders by stabilizing bow light boats! Increases top end, saves fuel, pops up skiers in half the usual time! Made in the USA of non-flexing marine aluminum finished with a baked-on powder coat. Use on fishing boats, runabouts, pontoon boats, cruisers, ski boats and bass boats.
The unique design extends out behind the prop and utilizes prop wash energy. It transforms that energy into lift against the Whale Tail XL for immediate response when you apply the throttle. Installs in 5 minutes with stainless steel hardware which is included.