North Sonar SF Surf Series Wing Set With Aluminium Mast

North Sonar SF Surf Series Wing Set with Aluminium mast

North have engineered their Sonar Surf Series (SF) for super low stall speeds, effortless pumping and surf-style carving. Ideal for riders wanting more from surf and downwind swells (with or without a wing in hand). The foils insensitivity to angle of attack change forgiveness means you don’t have to be an expert or have perfect pumping technique. A refined balance of roll stability and manoeuvrability gives you confidence during pumping and take-offs, and the ability to initiate powerful rail-to-rail carves. Push it harder, lip stall and lay down banking turns, knowing tip ventilation is a thing of the past. Reduced distance between the mast and front wing makes for faster, tighter pivoting turns. North have kept the span similar between the three sizes, providing the same ride feel across the entire size range. The SF promises that frictionless sensation of glide at slower speeds. Responsive and agile. With intuitive recovery. Wakesurfing ten waves back, prone-surfing, wing-surfing, pumping or mastering the downwind. The Sonar SF Series. At one, with it all.

Sizes: SF680, SF830, SF930, SF1080 and SF1230. (See the Size Guide Tab)

Available in a choice of 5 front wing sizes and two Aluminium mast lengths. Choose your mast length from the dropdown menu between the 72cm and the 85cm. All variations (except for the SF680 which comes with an S185 stab) come complete with an S215 rear stabiliser and 600mm fuselage.

The “set” comes complete with all required fixing bolts, tool set, covers for the front and rear wings and a travel bag.

For the features of the SF Range, see the Features Tab.

Features

Features

Progress faster
Moderate anhedral rondure combines with a gentle back-swept plan shape combine to create a good balance of roll stability, for confidence during pumping and take-offs, and manoeuvrability, for initiating turns with ease.

Effortless pumping
To maintain an efficient window of operation at the lowest pumping speed, North needed to generate more lift out of the foil section whilst always trying to balance drag vs lift. So to find that compromise they shifted the peak in the lift-to-drag ratio to the lower end of the speed range. Having more profile thickness and curvature in the front section of the profile makes it less sensitive to angle of attack changes. At the opposite end the North HA Wings have a flatter section at the front, which makes it more sensitive to angle of attack changes. They are high speed, but easier to stall.

Composed glide
The SF can be compared to a high-aspect wing but only at lower speeds. The Sonar HA wings have a phenomenal glide at a higher speed but you need to maintain it somehow. Because the design team loved the frictionless sensation of glide so much, they’ve engineered the same glide into the slower speeds SF-Front Wings.

Responsive turning
The design team also moved the wings as far back on the fuselage as possible for a better turning response, so you may need to move the mast further forward on the track compared to other North wings. Mounting the front wing closer to the mast reduces your yaw stability, so you can initiate turns more easily.

Match with S215 Stabiliser
Because the front wing can operate at such a high-angle of attack without stalling, you need a stabiliser that does the same. With smaller front wings, you want to upgrade to a smaller stab, but it’s important to match the stall speed. The S215 was created with lower stall speed to complement that of the SF front wings.

Materials

• Pre-Preg Carbon
• Titanium Screws