Downwind Machine

The Ultra is unlike any downwind foil you've seen. With a smooth take off and incredible speed range its built to perform in all conditions. What sets it apart is its ability to carve rail to rail in a way that no other downwind foil can. 

Who's it for?

Discipline: Downwind

Skill Level: Intermediate, Advanced

Riding Style: Excelling for downwind riders, but also performing fantastic for wing or prone in rolling swell. 

What Makes The Ultra Different?

Efficiency & Glide

Tubercles and a slim design paired with a high AR foil means it is the ultimate for efficiency and glide through the water.

• Aspect ratio of 14
• Ultra thin design & fast profile
• Tubercles for slippery feeling
• Winglets reduce unwanted tip vortices (drag)

Rail To Rail Carving

As with all AFS foils the Ultra turns incredibly well. Flying downwind on bumps is fun, but what's more fun is ripping them up like an an endless wave.

• Thin tips reduce resistance to roll
• Ultra stiff design increases responsiveness
• Tubercles keep the foil stable at high bank angles
  

Tip Breaching

Designed to push the limits of carving, the ultra excels at tip breaching. 

• Tubercles keep the foil lifting while breaching
• So smooth you don't even notice
• Thin tips slice the water with ease

Monoblock Design—Why It Matters

The front wing and fuselage are one piece, making the Silk incredibly stiff and efficient.

• Less flex, more direct response.
• Slim connection = maximum water efficiency.

Built Different—World-Class Construction

Made in France, Not a Generic Factory

Most foils are mass-produced in China. AFS owns their own factory in France, allowing for:

• Tighter quality control
• Higher level of finish
• More advanced carbon construction

Ultra High Modulus (UHM) Carbon

By using UHM carbon, AFS achieves:

• A stiffer, lighter foil
• More refinement & design freedom
• Better performance in every condition

Tubercles: What Are They & Why Do They Matter?

Tubercles (those bumps on the leading edge) have one job—to delay flow separation.

💡 What’s flow separation?
It’s when water stops following the foil before the trailing edge, causing instability, inconsistent lift, and loss of control. Every foil deals with this problem.

Tubercles fix this by creating tiny vortices that keep water attached to the foil for longer, making the Ultra:

• More stable at all speeds—no unexpected lift changes.
• Incredibly smooth through turns—even at high bank angles.
• More predictable in turbulent water—great for white water and choppy conditions.

You know when your foot pressure changes when a wave builds power or your speed changes?

The Ultra eliminates that. It stays steady no matter what, so you can push harder with total confidence.

Are There Any Downsides?

Only one—a slight reduction in absolute top speed. That’s why AFS race foils don’t use tubercles.

But here’s the thing:

• Unless you’re an expert racing at max velocity, this won’t matter.
• The Ultras stability actually lets you ride faster, because you can push harder without hesitation.
• Thanks to its thin, ultra-efficient design, the Ultra is still one of the fastest downwind foils in the world.

Why Don’t All Foils Have Tubercles?

Simple—they’re harder to design and manufacture.

• Outsourced production = lower quality control → Most brands can’t get tubercles right.
• AFS owns their own factory → They have the precision needed to make them work perfectly.

This is why AFS is the only brand making high-performance tubercle foils at this level.

Tubercles Have Proven Benefits In Research

This isn't just marketing—tubercles have been extensively studied in hydrodynamics & aerodynamics, with CFD simulations and real-world testing proving their ability to reduce flow separation, increase stability, and improve efficiency.

The Bottom Line

The Ultra isn’t just another downwind foil—it’s a precision-engineered machine built for speed, control, and next-level carving. With tubercles for stability, an ultra-thin profile for glide, and a monoblock carbon construction for unmatched stiffness, it delivers a riding experience like no other.

Whether you're chasing endless bumps or pushing hard in rolling swell, the Ultra gives you the confidence to ride faster, turn harder, and stay in control in any conditions.

If you're serious about downwind performance, this is the foil that will take you there.