Prone Surf • Wing Surf • Parawing • Wake • Pump • Assisted Foiling
North Sonar SF Front Wing
Super-low stall speed, effortless pumping and surf-style carving — engineered to stay connected when the wave loses power.
The North Sonar SF Front Wing combines the low-speed lift of a dedicated surf foil with the glide and efficiency normally associated with a higher-aspect design. Its forgiving foil section helps the wing recover from near-stalls with one or two pumps, while the refined area distribution, moderate anhedral and swept outline deliver controlled rail-to-rail carving. Available from the compact, performance-focused SF530 to the lift-rich SF1230, the range covers prone surfing, wing surfing, parawing, wake foiling, pumping and assisted foiling.
- Super-Low Stall Speed
- Effortless Pumping
- Surf-Style Carving
- Pre-Preg Carbon
- Titanium Hardware
- Six Sizes
- 82.2–190.7 sq. in. (530–1230 cm²)
- North Sonar Modular System
Why You’ll Love the North Sonar SF
Stay Flying at Lower Speeds
The SF’s evolved foil section generates strong lift at the lower end of its speed range. This gives you more time in the pocket and helps the foil continue flying when wave or wake energy fades.
Pump Back into the Ride
The profile is forgiving of sudden angle-of-attack changes. When the foil approaches a stall, a well-timed pump can quickly rebuild speed and help connect another wave or wake.
Carve with Confidence
Reduced area toward the tips lowers the force required to roll the foil. The result is responsive rail-to-rail control without sacrificing the stability needed for pumping and takeoff.
Ride a Smaller Wing
Because the SF produces substantial low-speed lift for its area, experienced riders may be able to choose a smaller, more responsive wing than expected while retaining useful pumping performance.
Designed for Surf-Focused Foiling
Prone Surf Foiling
Low-speed lift gives riders more time to paddle, catch the wave and establish stable flight. Once flying, the SF delivers the roll control and tight banking response needed for surf-style lines.
Wing Surfing and Parawing
The SF lifts efficiently without requiring excessive board speed. Riders can choose a smaller, more maneuverable front wing for carving swell while retaining a forgiving lower speed range.
Wake and Assisted Foiling
Efficient pumping and strong low-speed energy transfer help riders connect boat wakes, ride farther back or use assisted power to access waves before switching attention to the surf.
Pump and Downwind Practice
The SF favors a manageable pumping cadence, composed glide and easy recovery. It is a versatile choice for riders developing pump technique or working toward open-water downwind skills.
Key Features
Low-Speed Foil Section
Additional profile thickness and curvature in the forward section help generate lift at lower speeds while making the wing less sensitive to aggressive or imperfect pumping inputs.
Efficient Area Distribution
Area is distributed across the span to balance pump stability with responsive turning. Reduced tip area lowers the rolling moment, allowing the foil to bank with less rider effort.
Moderate Anhedral
The front-view curve provides useful roll stability for takeoffs and pumping while retaining enough freedom to initiate smooth rail-to-rail carves.
Gently Swept Outline
The swept planform supports controlled yaw response and intuitive turning, helping the foil move from smooth drawn-out carves into tighter surf-style redirects.
Composed Low-Speed Glide
North developed the SF to deliver an efficient gliding sensation at a lower speed than its dedicated HA Series. This helps riders stay with slower waves instead of outrunning them.
Responsive Fuselage Position
The front wing sits farther back on the fuselage than some other North wings. This reduces yaw stability slightly and makes it easier to initiate a turn.
Pre-Preg Carbon Construction
The carbon laminate provides the stiffness and direct feedback required for efficient pumping, controlled loading through turns and predictable response across the speed range.
Six Size-Specific Designs
Each size has its own span and aspect ratio. Smaller sizes become progressively more performance-oriented, while larger sizes prioritize lift, low-speed support and accessible pumping.
Performance Feel
Takeoff
Lift builds early and predictably, helping the rider rise onto foil without the high entry speed associated with thinner, speed-focused front wings.
Pumping
The SF accepts both deliberate full-body pumps and smaller corrective inputs. Its forgiving recovery helps maintain flight when timing or pitch is not perfect.
Carving
The foil rolls smoothly from side to side and responds quickly to rider input. Refined tips support powerful banking turns without making the foil feel excessively locked in.
Glide
Glide is calm and controlled rather than dependent on maximum speed. This makes it easier to stay in the wave’s usable energy and prepare for the next turn or pump.
SF, MAv2 or DW?
Choose the SF Series For
- Super-low stall speed
- Effortless pumping and stall recovery
- Surf-style rail-to-rail carving
- Prone, wake, wing surf and parawing
- Staying with slower waves and wakes
- A balance of glide and maneuverability
Choose the MAv2 Series For
- All-around freeride performance
- Predictable pitch stability
- Progression across multiple disciplines
- Controlled early lift
- Learning and recreational wing foiling
- A more general-purpose front wing
Choose the DW Series For
- Maximum downwind glide and projection
- Low drag over longer distances
- Open-water swell and SUP downwinding
- Higher-aspect performance
- Ventilation resistance during tip breaches
- Experienced riders prioritizing efficiency
The SF Sweet Spot
The SF sits between the accessible versatility of the MAv2 and the specialized glide of the DW. It is the surf-focused choice when pumping, turning and low-speed connection matter more than maximum straight-line projection.
Sizes and Recommended Stabilizers
| Front Wing | Item Number | Area | Wingspan | Aspect Ratio | North Recommended Stabilizer | Included Screw Pack |
|---|---|---|---|---|---|---|
| SF530 | 85004.250132 | 82.2 sq. in. (530 cm²) | 29.5 in. (750 mm) | 10.6 | S185 | Pack H M8 × 0.91 in. (23 mm) |
| SF680 | 85004.240095 | 105.4 sq. in. (680 cm²) | 31.1 in. (790 mm) | 9.2 | S185 | Pack D M8 × 0.98 in. (25 mm) |
| SF830 | 85004.240096 | 128.7 sq. in. (830 cm²) | 34.1 in. (865 mm) | 9.0 | S185 or S215 | Pack D M8 × 0.98 in. (25 mm) |
| SF930 | 85004.230091 | 144.2 sq. in. (930 cm²) | 35.4 in. (900 mm) | 8.8 | S215 | Pack D M8 × 0.98 in. (25 mm) |
| SF1080 | 85004.230092 | 167.4 sq. in. (1080 cm²) | 36.0 in. (915 mm) | 7.8 | S215 | Pack D M8 × 0.98 in. (25 mm) |
| SF1230 | 85004.230093 | 190.7 sq. in. (1230 cm²) | 36.6 in. (930 mm) | 7.1 | S215 | Pack F M8 × 1.18 in. (30 mm) |
Important: The SF sizes use different mounting-screw lengths. Always use the screw pack supplied for your specific front wing and verify correct thread engagement before entering the water.
Recommended Stabilizer Pairing
SF530 and SF680 — S185
North recommends the S185 Surf Series Stabilizer for both the SF530 and SF680. Its smaller area complements the speed, roll response and maneuverability of these compact front wings while retaining suitable low-speed support.
SF830 — S185 or S215
The SF830 can be paired with either the S185 or S215. Choose the S185 for a faster, looser and more responsive feel, or the S215 for additional pitch support, front-foot pressure and low-speed stability.
SF930–SF1230 — S215
North’s direct recommendation for the SF930, SF1080 and SF1230 is the S215 Surf Series Stabilizer. It was developed with a low stall speed to complement the larger SF front wings.
Advanced Glide Alternative
North also identifies its Glide /2 stabilizers as compatible performance options for the SF Series. The flatter S142 or S192 can produce a faster, looser and lower-drag ride, but requires more advanced foil control and careful sizing.
Best starting point: Use the Surf Series recommendation listed for your front-wing size. Move to a Glide /2 stabilizer only when you specifically want less drag and a more technical, performance-oriented feel.
Which SF Size Should You Choose?
SF530
The smallest, highest-aspect and most performance-focused SF. Best for advanced riders, powerful surf, assisted foiling and situations where speed, tight turning and minimal front-wing area are priorities.
SF680
Fast, highly maneuverable and surprisingly efficient for its area. A strong option for experienced surf and wing foilers who want compact-wing response with useful pumping ability.
SF830
A versatile performance size that balances low-speed lift, glide and responsive carving. The choice of S185 or S215 allows the setup to be tuned toward looseness or stability.
SF930
A balanced all-around surf size with approachable low-speed performance. It suits prone, wake and wing-surf riders looking for a blend of pumping, glide and maneuverability.
SF1080
Provides additional lift and low-speed support for softer conditions, easier pumping and riders who need more carrying capacity without moving to the largest SF.
SF1230
The largest and most lift-oriented SF. Choose it for maximum low-speed support, smaller waves, lower-energy wakes, pump-focused sessions or riders who need the greatest carrying capacity.
Front-wing choice depends on rider weight, skill, board, power source and wave or wake energy. Smaller does not automatically mean better: choose enough area to launch reliably and remain connected in your usual conditions.
Compatibility and Setup
North Sonar System
The SF Front Wing is designed for the modular North Sonar foil system and must be connected to a compatible North Sonar fuselage, mast and stabilizer. It is not a universal front wing.
Stabilizer Sold Separately
This listing is for the front wing only. The recommended S185 or S215 stabilizer, fuselage, mast and board-mounting components are required to complete the foil and are sold separately unless stated otherwise.
Size-Specific Mounting Screws
SF530, SF680–SF1080 and SF1230 use different screw packs. Do not assume the mounting screws from another North front wing are the correct length.
Mast-Track Position
Because North moved the SF wing farther back on the fuselage to improve turning response, some riders may need to move the mast slightly farther forward in the board track compared with other North front wings.
Who Is the North Sonar SF For?
Best Rider Profiles
- Prone surf foilers who need dependable low-speed lift
- Wing surfers prioritizing waves and carving
- Parawing riders seeking early lift and pumpability
- Wake foilers connecting multiple wakes
- Assisted-foil riders transitioning onto wave energy
- Foilers developing pump and downwind technique
- Experienced riders sizing down for more maneuverability
What You’ll Notice
- Early, progressive lift
- A remarkably low stall speed
- Forgiving recovery after a speed loss
- Efficient pumping between waves
- Smooth rail-to-rail roll
- Responsive banking turns
- Composed glide at lower speeds
- More surf freedom than a straight-line foil
Foil Safety
Hydrofoil wings and stabilizers have hard, sharp edges. Keep the protective cover installed during transport and assembly, inspect all components and mounting hardware before every session, and avoid contact with swimmers or other water users. Open-water pumping and downwinding require appropriate training, flotation, leashes, communication equipment, route planning and local knowledge.
What’s Included
Included
- North Sonar SF Front Wing in selected size
- Protective front-wing cover
- Size-specific titanium mounting screw pack
Not Included
- S185, S215 or Glide Series stabilizer
- North Sonar fuselage
- Foil mast
- Board adaptor or board-mounting hardware
- Foilboard
- Wing, parawing, paddle or assisted-foil system
- Leashes and personal safety equipment
Need help selecting an SF size or stabilizer? Call Windance and talk to a foil expert. We can help match your setup to your weight, experience, board, local waves and preferred discipline.
North Sonar SF FAQ
What does SF mean?
SF identifies North’s Surf Front Wing Series. The range is designed around low-speed lift, efficient pumping and surf-style turning.
Is this a complete foil?
No. This product includes the selected front wing, its cover and the correct mounting-screw pack. A compatible North Sonar stabilizer, fuselage and mast are required.
Which stabilizer does North recommend?
North recommends the S185 for SF530 and SF680, either the S185 or S215 for SF830, and the S215 for SF930, SF1080 and SF1230.
What is the difference between S185 and S215?
The smaller S185 creates a faster, looser and more maneuverable ride. The larger S215 adds stability, low-speed support and front-foot pressure.
Can I use a Glide Series stabilizer?
Yes. North identifies the Glide /2 Series as compatible with SF front wings for advanced riders seeking less drag and a looser feel. The Surf Series recommendation remains the best starting point.
How is the SF different from the MAv2?
The SF is more surf- and pump-focused, with a lower stall speed and more carving freedom. The MAv2 is the more general-purpose choice for progression, pitch stability and all-around freeride use.
How is the SF different from the DW?
The SF prioritizes low-speed lift, pumping and turning. The higher-aspect DW Series prioritizes low drag, long-distance glide and open-water downwind efficiency.
Will I need to change my mast position?
Possibly. North notes that the SF sits farther back on the fuselage for quicker turning response, so you may need to move the mast slightly farther forward in the board track.
Do all SF sizes use the same screws?
No. The SF530 uses M8 × 0.91 in. (23 mm), SF680–SF1080 use M8 × 0.98 in. (25 mm), and SF1230 uses M8 × 1.18 in. (30 mm) mounting screws.
Which SF size should I choose?
Smaller sizes favor speed and maneuverability, while larger sizes provide more lift and low-speed support. Consider rider weight, experience, board, wave energy, power source and how reliably you need the foil to launch.
Why North Sonar SF?
The North Sonar SF Series is built for the part of foiling where connection matters most: staying with the wave, rebuilding speed with a pump and turning without losing flow. Its low-speed foil section, composed glide, responsive outline and six-size range create a versatile platform for prone, wing surf, parawing, wake, pump and assisted foiling.
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