Rear wings

A rear wing (rear wing or stabilizer) is the small rear wing of a hydrofoil in watersports. It is located at the rear end of the fuselage and works hand in hand with the large front wing. Its main job is not to generate lift, but to stabilize the entire foil system underwater and maintain the balance around the pitch axis.

Design and operation

• Material & shape: Just like the front wings, stabilizers are usually made of stiff carbon. They are significantly smaller than the front wing and often feature an inverted camber (negative profile) to generate a slight downward force that offsets the lift of the front wing.
• Trimming: The angle at which the rear wing is bolted to the fuselage (angle of attack) largely determines the flight characteristics. Many modern systems allow this angle to be adjusted minimally using small washers (shims) to perfectly tune the foil to the conditions.

Features and characteristics

• Flight stabilization (pitch control): Without the rear wing, the foil would tip uncontrollably forward or backward. It ensures that the board maintains a stable flight height and does not immediately dive or shoot away with every small shift in the rider's weight.
• Size controls damping: Larger stabilizers offer more resistance to tipping movements. This makes the board feel extremely forgiving, smooth, and stable. Smaller models reduce damping, making the foil noticeably livelier and more responsive.
• Impact on speed: Since the rear wing is smaller, it generates less hydrodynamic drag than the front wing. A very small, thin stabilizer minimizes drag in the water to the maximum, thus enabling significantly higher top speeds and a better glide.