A Parawing flies thanks to lift. When wind passes over its profile, air accelerates on top and creates a depression that pulls the wing upward and forward. Lines connected to the bar keep it in tension, and you adjust its angle of attack in the wind to transform this lift into useful traction.
Flying is just the beginning. A Parawing moves forward, accelerates, goes upwind, but can also stall or collapse. All of this stems from the same aerodynamic laws. Here, phenomenon by phenomenon, is what really happens.
At a glance
| Behavior | Why |
|---|---|
| It flies | The profile's lift raises and pulls it |
| It moves forward | Part of the lift is directed forward |
| It accelerates | Lift exceeds resistance, apparent wind increases |
| It slows down | Drag overcomes traction |
| It goes upwind | Forward traction plus foil's anti-slip |
| It stalls | Angle of attack is too high, air leaves the profile |
| It collapses | It loses internal tension or pressure |
What creates lift?
Lift comes from the curved shape of the wing. Air circulating over the top moves faster and exerts less pressure than slower air underneath. This pressure difference generates a net force upward and forward. Another way to say it: the wing deflects air downward, and in reaction the air pushes the wing upward. Lift increases with surface area, angle of attack, profile thickness, and air speed.
Why does it also generate drag?
Drag is air resistance to the wing's passage. It has three sources: the wing's shape, air friction on the fabric, and vortices created at the wing tip by lift itself, induced drag. Drag slows you down, but it is inseparable from lift: you reduce it with a thin profile and good aspect ratio, but you never eliminate it.
Why does a Parawing move forward?
Because lift is not purely vertical: part of this force is directed forward. This component pulls you, and the foil converts traction into speed by eliminating water resistance under the board. A Parawing is not pushed by wind like a sail: it pulls, thanks to the lift of its profile.
Why does it accelerate?
When you sheet in or place the wing in the powerful zone of the wind window, angle of attack increases, lift rises, and traction grows. The loaded foil erases the hull's drag. Apparent wind then strengthens with speed, which maintains acceleration: the faster you go, the more power the wing has.
Why does it slow down?
When resistance exceeds traction. By easing, you reduce angle of attack and power. A wing that starts to collapse creates mostly drag. And if the foil stalls at low speed, the hull falls back in the water and brakes you hard.
Why does it go upwind?
Because the wing's traction is directed slightly forward and the foil prevents the board from slipping. Going upwind doesn't mean heading straight into the wind, but advancing diagonally against it. The finer your heading and the higher your speed, the better your real gain to windward, your VMG. The subject is covered in detail in our article can you go upwind in Parawing.
Why does apparent wind change everything?
At rest, you only feel the true wind. As soon as you move forward, your speed creates a headwind that adds to the true wind: this is the apparent wind, stronger and more directed forward. It's what moves the Parawing forward, even when true wind weakens, and that's why you must sheet in the wing toward the front as you accelerate.
Why does a Parawing stall?
When the angle between the wing and the wind becomes too large. Air no longer follows the profile, separates, lift drops suddenly, and the wing falls. We call this critical angle the stall angle. In Parawing, this often happens when pulling too hard on the bar or losing line tension.
Why does a Parawing collapse?
When it loses internal tension and its leading edge folds. A Parawing is a flexible wing that holds its shape thanks to wind pressure and its bridle system. If tension drops, during a wind gust that fades or a sudden movement, the leading edge folds and the wing collapses. The tips, the ears, are the first affected.
Can you reduce lift without deforming the wing?
That's the whole point of power management systems. On a fixed-geometry wing, reducing power means changing angle of attack: the wing moves back in the flight window and your heading degrades. Some designs instead act on the wing's geometry itself to decrease loaded surface without touching angle of attack. The principle is explained in our technical analysis of dynamic ease-sheet with the PushBar System®.
Frequently asked questions
Does a Parawing fly without wind?
No. Without air flow over the profile, there is no lift. True wind, or your movement once launched, is essential.
Do you need strong wind for a Parawing to fly?
No. Takeoff requires a minimum of wind, but once the foil is launched, apparent wind takes over and the wing continues to pull, even in moderate wind.
Does a light Parawing fly better?
In light wind, yes. The lighter the wing, the less lift is needed to sustain it. A light and water-resistant material takes off earlier and remains efficient even after contact with water.
Can you head directly into the wind?
No. No wing makes progress straight into the wind. You advance at an angle, then chain tacks to gain to windward.
Why does a Parawing sometimes fall?
Because air no longer flows correctly over the profile: angle of attack too low or too high, loss of line tension, or wind too light.
What's the difference between a Parawing and a Wing foil?
The Parawing is controlled by lines connected to a bar, like a kite. The Wing foil is held in your arms thanks to an inflatable boom. Both create lift, but their handling differs.
About the author
Bruno Sroka is a three-time world champion in Kitesurfing and Kitefoil. He completed the Cape Horn crossing (2008), the English Channel record (2012), and the France-Ireland link of 444 km (2013). A former PE teacher, he is the founder of SROKA Company, a Breton brand specializing in foil, Wing foil, SUP, and Parawing, and the designer of the PushBar System®.
To go deeper: lift, apparent wind, angle of attack, and VMG in the glossary. On piloting, see all the moves to fly a Parawing. If you're discovering the discipline, start with what is a Parawing and the guide to 30 essential questions. After your session, remember to maintain your Parawing. Discover all our wings in the Parawing collection.
