attwood Outboard Motor Hydro-Stabilizer 9401-7 Improve planing performance and stability For use on outboards under 50 horsepower Designed from engineered molded resins, the Hydro-Stabilizer helps to get up on plane, reduces ventilation / cavitation and poor handling The Hydro-Stabilizer out-performs ordinary flat hydrofoils by reducing drag when the hull goes on plane. Improves getting skiers and wakeboarders up easier and faster