Pre-Preg Carbon Mast for the North Sonar Foil System
North Sonar Carbon Foil Mast
A stiff, responsive and corrosion-resistant carbon mast for wing, surf, kite, tow and downwind foiling.
The North Sonar Carbon Foil Mast delivers direct foil feedback and dependable stiffness through a refined one-piece pre-preg carbon construction. Its tapered profile is engineered for efficient load transfer and reduced surface friction, giving riders a responsive connection between the board and foil across multiple disciplines.
An integrated 165 × 90 mm mounting plate connects directly to compatible foil-board tracks, while North’s GeoLock tapered geometry creates a rigid, load-bearing mast-to-fuselage connection. Choose CF72 for surf, tow and shallower water, CF85 for all-around wing and open-water riding, or CF95 for high-speed kite, wing and race-oriented foiling.
- CF72 / CF85 / CF95
- Pre-Preg Carbon
- 16 mm Minimum Thickness
- GeoLock Connection
- 165 × 90 mm Mounting Pattern
- Mast & Cover Only
Why Choose the Sonar Carbon Mast?
Direct Carbon Response
The stiff pre-preg carbon structure transfers rider input quickly to the foil. This provides immediate feedback when pumping, carving, changing direction or correcting ride height.
Tapered One-Piece Design
North’s refined one-piece construction is tapered for optimal load transfer and lower surface friction. It combines structural strength with a clean hydrodynamic profile suitable for surf, wing, kite and tow foiling.
GeoLock Connection
GeoLock uses tapered locking geometry to transfer loads across the mast’s full cross-section. The screws engage the connection, but the mating surfaces carry the riding loads, creating a stiff and durable mast-to-fuselage interface.
Integrated Board Mount
The carbon mast mounts directly to compatible foil-board tracks through its integrated top plate. No separate Sonar foil-board adapter is required for the CF mast.
Corrosion-Free Mast Structure
Carbon construction eliminates the corrosion concerns associated with an aluminum mast extrusion. Metal screws and connected components should still be rinsed, dried and periodically removed after saltwater use.
Modular Sonar Compatibility
The GeoLock base connects with compatible North Sonar carbon and aluminum fuselages. Riders can change fuselage, front wing and stabilizer configurations while retaining the same mast.
Complete Mast Specifications
| Model | Length | Minimum Thickness | Minimum Chord | Weight | Construction |
|---|---|---|---|---|---|
| CF72 | 720 mm / 72 cm / 28.3 in | 16 mm | 115 mm | 1.75 kg / 3.86 lb | Carbon pre-preg |
| CF85 | 850 mm / 85 cm / 33.5 in | 16 mm | 115 mm | 1.90 kg / 4.19 lb | Carbon pre-preg |
| CF95 | 950 mm / 95 cm / 37.4 in | 16 mm | 115 mm | 2.30 kg / 5.07 lb | Carbon pre-preg |
The 16 mm thickness and 115 mm chord are North’s published minimum profile measurements. Because the mast is tapered, its dimensions vary along its length.
Which Mast Length Should You Choose?
| Model | Best For | Why Choose It | Considerations |
|---|---|---|---|
|
CF72 Surf & Shallow Water |
Prone surf, tow, pump foiling, shallower water and compact foil setups. | The shortest and lightest option offers agile handling, lower swing weight and a more manageable ride during starts and touchdowns. | Provides less clearance in large chop, steep swell or heavily banked turns. |
|
CF85 All-Around Choice |
Wing foiling, kite foiling, open-water surf and mixed-discipline riding. | Balances useful ride-height range with manageable weight and leverage. It gives wing riders enough clearance to cross chop and bank through turns. | Less compact than CF72 and provides less clearance than CF95 in racing or large open-water conditions. |
|
CF95 Speed & Clearance |
Kite foiling, high-speed winging, racing and deep-water riding. | The additional length allows greater heeling and banking angles while keeping the foil submerged through large chop and swell. | Heavier, creates more leverage and is more demanding during starts, low-speed riding and touchdowns. |
Our recommendation: CF72 is the specialist surf and shallow-water size. CF85 is the best choice for most wing and multi-discipline riders. CF95 is intended for experienced kite, race and high-speed riders who specifically need the additional clearance.
Standard Carbon vs. Aluminum, UHM & HM Masts
| Mast | Best For | Why Choose It | Primary Tradeoff |
|---|---|---|---|
|
Sonar Carbon CF Best Carbon Value |
Riders wanting a stiff, responsive carbon mast for multiple foil disciplines. | Strong balance of stiffness, durability, corrosion resistance and price, with 72, 85 and 95 cm options. | Thicker and less hydrodynamically efficient than North’s HM and UHM performance masts. |
| Sonar Aluminum AF | Beginners, schools and value-focused riders prioritizing durability and replaceable components. | Substantially more affordable and well suited to progression or hard everyday use. | Heavier, requires a separate board adapter and offers less immediate feedback than carbon. |
| Sonar UHM73 | Prone surf, pump and downwind riders seeking minimum drag and fast maneuvering. | A 13.5 mm minimum thickness, short 100 mm chord and 1.56 kg weight improve glide, pumping efficiency and turning response. | Specialized 73 cm length and a significantly higher price than CF72. |
| Sonar HM/UHM80 | Prone, pump and downwind riders wanting a longer low-drag performance mast. | The 13.5 mm profile and 108 mm minimum chord reduce drag while High Modulus carbon increases bending and torsional stiffness. | More expensive and less broadly positioned than the standard CF85. |
| Sonar HM/UHM85 | Advanced wing riders seeking better glide, speed and stiffness without changing from an 85 cm length. | Approximately 15% thinner than the standard CF mast, with a wind-focused chord and higher structural stiffness. | Premium price; CF85 remains the better value for recreational and mixed-discipline riding. |
| Sonar HM/UHM95–105 | Foil racing and advanced high-speed kite or wing riding. | Thin 12.5 mm profiles are designed for reduced drag and greater top-end speed. | Premium specialist masts; North states the 95 and 105 cm HM/UHM models are not intended for jumping. |
Choose standard CF for the best balance of carbon performance, durability and price. Choose aluminum for progression and value. Choose HM or UHM only when lower drag, additional stiffness and discipline-specific performance justify the higher cost.
Compatibility
- Compatible with North Sonar carbon and aluminum fuselages using the GeoLock connection.
- Integrated top plate uses an industry-standard 165 × 90 mm mounting pattern.
- Designed to work with North DropBox foil tracks and compatible standard twin-track foil boards.
- No separate Sonar foil-board adapter is required.
- The mast does not include a fuselage, front wing, stabilizer or foil-to-board mounting hardware.
- Not compatible with AK mast-series components.
Confirm your board-track dimensions and fuselage connection before ordering. “Compatible with any Sonar Carbon or Alloy Fuselage” refers to compatible North Sonar GeoLock fuselages—not unrelated foil brands.
What’s Included
Included
- North Sonar Carbon Foil Mast in the selected length
- Protective carbon mast cover
Not Included
- Fuselage
- Front wing
- Rear stabilizer
- Mast-to-fuselage screws
- Foil-to-board mounting screws and track nuts
- Sonar travel bag
This is a mast-only product. Riders needing the mast, C700 fuselage, S270 stabilizer, hardware and travel bag together should choose the North Sonar Carbon Foil Edition.
Frequently Asked Questions
Does the carbon mast require a board adapter?
No. The mast has an integrated 165 × 90 mm top plate and mounts directly to compatible foil-board tracks. The separate Sonar board adapter is used with North’s modular aluminum masts.
Which size is best for wing foiling?
CF85 is the best all-around wing choice. It provides enough ride height for chop, swell and banked turns without the extra weight and leverage of CF95.
Why choose CF instead of UHM?
Choose CF for excellent carbon performance at a lower price and with broader all-around durability. Choose UHM when reduced drag, pumping efficiency or maximum structural stiffness is worth the premium.
Is the mast completely corrosion-proof?
The carbon mast structure does not corrode like aluminum, but connected screws and metal fuselage components still require freshwater rinsing, drying and periodic disassembly after saltwater use.