Data sheet updated in May 2026
KR737-FCM-325-75/BB, The Ultimate Surf & Carve Machine. This modular complete foil kit, crafted from full carbon, is engineered for attacking critical wave sections. It masterfully blends the razor-sharp speed of the 737 Front Wing with a flat, slippery stabilizer. This enables explosive snaps and surgical carving. You'll experience granite-like stability through deep bottom turns, alongside the complete freedom to release the tail. This lightweight, stiff setup is purpose-built for high-speed rail-to-rail action.
KEY INFORMATION
SABFOIL RAZOR 737 BLACKBIRD MODULAR FULL CARBON COMPLETE FOIL KIT
What we like
- Razor 737 Front Wing: At 648 cm² with an AR of 8.4, its refined leading edge “bites” into the water during deep carves, preventing ventilation.
- Flat SF/325 Stabilizer: Its flat geometry lets you release the tail for snaps and redirects, delivering that characteristic skatey feel.
- FC/M Modular Fuselage in Full Carbon: Experience maximum torsional stiffness and direct transmission of your energy.
- Blackbird 75 Mast in UHM Carbon + W-Core: This compact mast is perfect for surf foil and wave riding.
- Shim set included: Both positive and negative shims are included to optimize your trim.
- Speeds of 13-15 / 25-27 knots for surf and carve-oriented wing sessions.
Kit Type
Modular Full Carbon
Color
Black
Disciplines
Wing foil Surf foil
Recommended for
Ideal for Surf, Wave, Fast Downwind, Freestyle, Freerace, and Prone Surf.
Included in the kit
- ✓ Sabfoil Razor 737 Blackbird Front Wing (WR737/BB) x 1
- ✓ Sabfoil Flat 325 Stabilizer (SF/325) x 1
- ✓ Blackbird Full Carbon modular fuselage size M (FC/M) x 1
- ✓ Sabfoil Piantone Blackbird 75 Mast (M75/BB) x 1
- ✓ Sabfoil Carbon Rail Plate with titanium inserts (CP02K/Ti) x 1
- ✓ Sabfoil Screw Set for Q02K (MHQ02) x 1
- ✓ Foam Pads for plate (MH144) x 1
- ✓ Hardware Carbon Plate to Mast (MH164) x 1
- ✓ Hardware Carbon Plate to Rail Board (MH160) x 1
- ✓ Sabfoil S325 Hardware Kit (MH108) x 1
- ✓ Negative Shim Set for stabilizers (MHW060) x 1
- ✓ Positive Shim Set for stabilizers (MHW061) x 1
- ✓ Additional Blackbird screw set MH173 x 1
- ✗ Board (sold separately)
- ✗ Protection bag (sold separately)
SURFING THE LIMITS OF PHYSICS
The Art of the Perfect Turn
In the pocket of a powerful wave, there's no room for hesitation. The true surfer seeks that elusive 'lock-in' feeling during a bottom turn, followed by the total freedom to snap the tail at the lip. While most high-aspect foils excel in a straight line, they often fall short when it's time to lean hard. The KR737-FCM-325-75/BB was designed for the carver, the rider who sees every wave as a high-speed canvas for drawing deep, aggressive lines.
Precision in the Pocket
This setup is a tactical attack against drag and instability. By combining the scalpel-sharp efficiency of the Razor 737 Front Wing with the Flat SF/325 stabilizer and the Blackbird 75 high-modulus carbon mast featuring W-core technology, Sabfoil has created a complete foil kit that thrives under G-forces. The FC/M carbon fuselage acts as the rigid backbone of the system. It ensures that energy from your legs is transmitted directly into the water without the dampening effect of traditional materials. It's lightweight, it's stiff, and it's built for rail-to-rail performance.
Technology & Feel: Surf, Carve, Repeat
Razor 737 Leading Edge: Designed with a refined profile that 'bites' the water during deep carves, preventing ventilation even when you push the foil to its structural limits. SF/325 Flat Tail 'Loose': The flat geometry of the stabilizer is key to radical surfing. It lets you release the tail for snaps and redirects. This offers a skatey and playful feel that traditional turned-up stabilizers can't match. FCM Carbon Torsional Stiffness: The full carbon modular fuselage eliminates any 'mushy' sensation. You'll feel the texture of the wave through your feet. This provides the granite-like stability needed to hold a high-speed rail-to-rail transition. Explosive Acceleration: The ultra-low drag of the 737 Front Wing lets you outrun the fastest sections and hit the lip with more vertical speed than ever before. High-G Recovery: Lift distribution is optimized for surfing, ensuring that after a radical maneuver or a deep cutback, the foil immediately regains its flight without stalling.
Who is it for?
This is the ultimate weapon for the Prone Surf purist and the carve-addicted wing rider. If your goal is to draw the tightest lines, reach the most critical sections of the wave, and experience the raw speed of a professional-level carbon setup, the KR737-FCM-325/BB is your instrument of choice.
| Specifications | |
|---|---|
| Sabfoil Reference | KR737-FCM-325-75/BB |
| Range | Blackbird |
| Range | Razor |
| Type | Modular Backtail Full Carbon |
| Disciplines | Wing foil, Surf foil |
| Recommended for | Surf, Wave, Fast Downwind, Freestyle, Freerace, Prone Surf |
| Front Wing, Wingspan | 737 mm |
| Front Wing, Surface | 648 cm² |
| Front Wing, Aspect Ratio | 8.4 |
| Front Wing, Root Chord | 108 mm |
| Front Wing, Maximum thickness | 14.7 mm |
| Stabilizer, Wingspan | 325 mm |
| Stabilizer, Surface | 155 cm² |
| Stabilizer, Aspect Ratio | 7.05 |
| Stabilizer, Root Chord | 58.9 mm |
| Stabilizer, Maximum thickness | 6.4 mm |
| Fuselage, Type | FC/M Modular Full Carbon |
| Fuselage, Total length | 645 mm |
| Mast, Height | 750 mm |
| Mast, Construction | UHM Carbon + W-Core |
| Mast, Board Connection | Carbon Plate |
| Total weight | Not communicated by Sabfoil |
| Take-off speed | 13 to 15 knots |
| Top speed (80 kg rider) | 25 to 27 knots |
| Color | Black |
FAQ, SABFOIL RAZOR 737 BLACKBIRD MODULAR KIT
Sabfoil presents the KR737-FCM-325-75/BB as the ultimate weapon for the Prone Surf purist and the carve-addicted wing rider. It's designed for surf, wave, fast downwind, freestyle, freerace, and prone surf. Expect take-off at 13-15 knots and top speeds of 25-27 knots (for an 80 kg rider).
The Balz Pro kits (805/905/965), endorsed by Balz Müller, are geared towards freestyle and wave. They also feature Front Wing surfaces specifically for wing foiling and speed. The Razor 737 kit, with its surf and carve orientation, uses a narrower high-aspect Front Wing (648 cm², AR 8.4) specifically designed for deep bottom turns and snaps. It also integrates a shorter 75 cm mast (compared to 85 cm for the Balz Pro). This makes it ideal for surf foil in shallow water.
The Piantone Blackbird 75 mast (750 mm) is more compact. This makes it particularly well-suited for surf foil and wave riding where clearance is less critical than in wing foil. It delivers improved responsiveness and minimizes the risk of hitting the bottom in shallow water. Its construction is identical to the M85. It features UHM Carbon + W-Core technology and a race-optimized profile.
Sabfoil offers the Razor range with four Front Wing sizes (737, 847, 977, and 1077). Each size is available in Integrated Backtail and/or Modular Full Carbon versions. The 737 (this complete foil kit) is exclusively available in the Modular version. While larger Front Wings (847, 977, 1077) offer an earlier take-off, they are less focused on radical surf.
Yes, this complete foil kit includes all necessary components: the WR737/BB Front Wing, FC/M fuselage, Flat 325 stabilizer (SF/325), Piantone Blackbird 75 mast, Carbon Rail plate with titanium inserts (CP02K/Ti), and the complete screw set and shims (MHQ02, MH144, MH160, MH164, MH173, MH108, MHW060, and MHW061). Only the board needs to be provided.
Sabfoil does not provide the total weight in its official specifications. An update will be provided as soon as the supplier communicates it. The only component weighed and sourced by Sabfoil in this kit is the M75/BB mast, at 1.665 kg.
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