UANOFCN Hydrofoil Stabilizer for Outboards 5–150 HP — 10¼" x 8¼" improves planing & reduces porpoising

This compact hydrofoil is engineered to change how small and mid-size boats get onto plane. Crafted for compatibility with most outboards and sterndrives rated from 5 to 150 horsepower, the stabilizer shifts trim behavior so the boat achieves a flatter, more stable ride at lower throttle. The package arrives with mounting hardware and a drill bit so you can fit it yourself or hand to a mechanic for a quick install.

How does the hydrofoil affect acceleration and planing?

By redirecting water flow at the lower unit, the foil helps lift the stern earlier during acceleration, which shortens time-to-plane and reduces bow rise. That means you can achieve cruising speed with less throttle and smoother transition through chop. This improves fuel efficiency indirectly by spending less time at high revs during launch.

• Raises stern to lower angle-of-attack during takeoff
• Reduces bow rise for quicker planing
• Improves throttle-to-speed responsiveness

Will this hydrofoil increase steering stability and reduce porpoising?

Yes — the foil dampens pitch and fore-aft oscillation, which reduces porpoising and frequent trim adjustments. Riders notice steadier tracking at cruising speeds and easier handling when encountering wakes or wind chop. It’s a passive device that works continuously once installed.

• Less fore-and-aft rocking in chop
• More consistent trim angle at speed
• Improved straight-line tracking with fewer steering corrections

Is the UANOFCN foil compatible with my motor and how is it installed?

The hydrofoil measures H 10-1/4" x W 8-1/4" and is made for outboards and sterndrives from 5 to 150 HP. Installation uses the supplied stainless steel screws, nuts, and a 6.5 mm drill bit; most installations take under an hour depending on access. Always follow your engine maker’s recommendations and check for interference with cavitation plates or trim tabs before final fastening.

• Dimensions: 10-1/4" height by 8-1/4" width
• Hardware included: screws, nuts, 6.5 mm drill bit
• Installation: surface mount on lower unit per instructions

What performance changes should I expect after fitting the stabilizer?

Expect improved takeoff, reduced tendency to porpoise, and steadier cruising with smaller trim adjustments. While gains vary by hull type, load, and motor, many operators report a more comfortable, predictable ride and easier trimming. This does not replace trim tabs for heavy load compensation but complements existing trim systems.

• Faster, smoother planing for single or lightly loaded boats
• Reduced need for aggressive trim corrections
• Better comfort for passengers in light to moderate chop

Who this product is for: UANOFCN’s Boat Doel Fin Hydrofoil is designed for recreational boaters, anglers, and small commercial operators running 5–150 HP outboards or sterndrives who want quicker plane, steadier tracking, and reduced porpoising without major engine modifications. It’s well suited to lightweight center consoles, fishing skiffs, runabouts, and anyone seeking a straightforward, bolt-on way to refine your boat’s on-water behavior.