How the Rogallo Flexible Wing Kite Works

A 1948 patent for a kite with a flexible, non-rigid wing that uses air pressure to maintain its shape during flight.

What it covers

The patent describes a kite wing made of flexible material that lacks a rigid frame. Instead of using wooden struts to hold its shape, the wing relies on the pressure of the wind to inflate and maintain an airfoil shape while tethered. This design allows the kite to be lightweight, foldable, and capable of stable flight without heavy structural supports.

What it doesn't cover

• —Does not cover rigid-frame kites like traditional box or diamond designs.
• —Does not cover motorized aircraft or powered flight vehicles.
• —Does not cover wings made of rigid materials like metal or wood panels.

The clever bit

The inventors realized that a wing does not need a solid skeleton if the air pressure itself can act as the structural support, drastically reducing weight and complexity.

Why it matters

This design became the foundation for modern hang gliders and paragliders. By proving that a flexible, fabric-based wing could provide stable lift, the Rogallos enabled the development of recreational foot-launched aviation.

Real-world examples

• 1.Modern hang gliders
• 2.Paragliders
• 3.Stunt kites
• 4.Parafoil parachutes