Davis Instruments Doel-Fin Hydrofoil Stabilizer Fin, Black, for Outboard and Stern Drive Motors 5 HP and Up

The Davis Instruments Doel-Fin is the original hydrofoil stabilizer fin, engineered by an aeronautical engineer to improve overall performance on boats powered by outboard motors or outdrive units. Molded in two pieces of guaranteed unbreakable, high-strength plastic, each foil flexes independently to absorb shock from waves and rough water, protecting the mounting hardware and smoothing out the ride. The Doel-Fin (Manufacturer Part Number 440) is designed for use with small motors, big motors, and inflatable dinghies alike, making it a versatile stabilizer across a wide range of boats.

Once installed, the Doel-Fin delivers greater stability at speed, consistent planing at lower RPM, faster out-of-the-hole acceleration, steadier turns, higher top-end speeds, and lower bow rise throughout the RPM range. Because the boat climbs onto plane sooner and rides flatter, the engine runs more efficiently, which can save up to 30 percent on fuel consumption. This also means faster starts and a smoother pull for water skiers and wake boarders.

The Doel-Fin fits all newer outboard and stern drive motors from 5 horsepower, with the exception of Volvo Penta outdrives. Installation takes about 15 minutes and all necessary hardware is included, so it can be mounted without special tools. It is finished in black and weighs 2 pounds.

Specifications

• Brand: Davis Instruments
• Manufacturer Part Number: 440
• Color: Black
• Material: High-strength plastic (two-piece molded)
• Weight: 2 pounds
• Compatible Motor Types: Outboard motors and stern drive (outdrive) units, 5 horsepower and up, except Volvo Penta outdrives
• Additional Compatibility: Inflatable dinghies
• Installation Time: Approximately 15 minutes
• Included Hardware: Yes
• UPC: 011698001859

Fitment

Fits all newer outboard and stern drive motors from 5 horsepower, except Volvo Penta outdrives. Also suitable for small motors, big motors, and inflatable dinghies.

Frequently Asked Questions

What is the Davis Instruments Doel-Fin? The Doel-Fin (Manufacturer Part Number 440) is a hydrofoil stabilizer fin that mounts on outboard motors or outdrive units to improve boat performance, originally developed by an aeronautical engineer.

Will the Doel-Fin fit my outboard motor? The Doel-Fin fits all newer outboard and stern drive motors from 5 horsepower, with the exception of Volvo Penta outdrives.

What is the Doel-Fin made of? It is molded in two pieces of guaranteed unbreakable, high-strength plastic, with each foil flexing independently to absorb shock.

How much fuel can the Doel-Fin save? Installing the Doel-Fin 440 hydrofoil can save up to 30 percent on fuel consumption by helping the boat plane at lower RPM.

How long does installation take? Installation of the Doel-Fin takes about 15 minutes, and all necessary hardware is included.

Can the Doel-Fin be used on inflatable dinghies? Yes, the Doel-Fin is designed for use with small motors, big motors, and inflatable dinghies.

What color is the Doel-Fin available in? The Doel-Fin 440 is finished in black.

How much does the Doel-Fin weigh? The Doel-Fin hydrofoil stabilizer weighs 2 pounds.

What performance benefits does the Doel-Fin provide? Benefits include greater stability, consistent planing at lower RPM, faster out-of-the-hole acceleration, steadier turns, higher top-end speeds, and lower bow rise at all speeds.

How is the Doel-Fin different from the Whale Tail XL stabilizer? The Doel-Fin is a two-piece molded high-strength plastic hydrofoil that flexes independently to absorb shock, while the Whale Tail XL is an aluminum stabilizer fin that extends out behind the prop to capture prop wash energy for lift.

Is the Doel-Fin a genuine Davis Instruments part? Yes, this listing is for the genuine Davis Instruments Doel-Fin hydrofoil stabilizer, Manufacturer Part Number 440.

Does the Doel-Fin help reduce bow rise? Yes, the Doel-Fin 440 lowers bow rise at all speeds while also steadying turns and improving overall stability.