Walkalong glider
A model aircraft sustained by the pilot's moving updraft.
A walkalong glider is a model aircraft that is both light and slow-flying. It stays airborne through controllable slope soaring, using the rising air created by the pilot walking beneath it, typically while holding a paddle. Updrafts can also be generated with hands or even the forehead. This form of soaring is distinct from other slope-soaring methods because the orographic lift—the "hill" of air—moves along with the plane, so no external wind is needed.
Several walkalong glider types have been patented, with named designs including the air surfer, the windrider, the tumblewing, and the follow foil. The activity is sometimes called controllable slope soaring, but it should not be mistaken for dynamic soaring. Ground effect is also not the same as ridge lift when explaining how these gliders stay up. Ground effect involves a horizontal surface, while ridge lift requires a sloping one. In ground effect, air does not need to move relative to the ground, whereas ridge lift demands wind blowing horizontally against a ridge. Walkalong gliders are sustained and steered by the ridge lift produced by the moving paddle.
The earliest known description of a walkalong glider comes from a 1955 patent by J. E. Grant. The first flight of a working walkalong glider appears briefly in the Academy Award-winning documentary *The Flight of the Gossamer Condor*.
For a walkalong glider to function, it must fly at or below walking speed. Using light materials and specific design choices reduces its flying speed. For instance, a paper walkalong glider made from lower-density paper has reduced wing loading and thus a lower airspeed. Different designs have varying wing loadings; tumblewing types, for example, have lower wing loading than traditional nose-weighted paper airplanes made from the same paper. In nose-weighted designs, the wings should include twist or washout to improve roll control near stall speed. While most walkalong gliders are flying wings (as are nearly all flying and gliding animals), designs based on traditional fixed-wing aircraft—with a tail or empennage—have been built from balsa wood sticks and tissue paper.
The paddle should be made from a lightweight but rigid sheet, such as corrugated cardboard or foamcore. A larger sheet creates a stronger updraft at its top edge.
- First description
- 1955 patent of J. E. Grant
- First flight appearance
- The Flight of the Gossamer Condor
- Typical paddle size
- 1-meter square area
- Typical materials for paddle
- corrugated cardboard or foamcore
Lore & Background
The first description of a walkalong glider appears in the 1955 patent of J. E. Grant. The first flight of a functional walkalong glider appears briefly in the Academy Award winning documentary The Flight of the Gossamer Condor. Walkalong gliding has also been referred to as controllable slope soaring but should not be confused with dynamic soaring. Ground effect should not be confused with ridge lift when explaining how walkalong gliders stay up. Ground effect involves a horizontal surface. Ridge lift requires a sloping surface. In ground effect the air does not have to move relative to the ground whereas ridge lift requires the wind to be blowing horizontally against the ridge. Walkalong gliders are sustained and controlled in the ridge lift produced by the moving paddle.
A walkalong glider must fly at or below walking speed. Light weight materials and specific design will reduce a walkalong glider's flying speed. For example, using a lower paper density will reduce a paper walkalong glider's wing loading and thus its air speed. Walkalong glider designs have differing wing loadings; for example, the tumblewing type designs will have lower wing loading than traditional nose weighted paper airplane designs made from the same paper density. For nose weighted walkalong glider designs, the wings should include a twist or washout to improve roll control close to stall speed. Although many walkalong gliders are flying wing designs (as are almost all flying and gliding animals), walkalong glider designs based on traditional fixed-wing aircraft (incorporating an empennage or tail) have been made from balsa wood sticks and tissue paper. The paddle should be made from a sheet of lightweight but rigid material such as corrugated cardboard or foamcore. The larger the area of the sheet the stronger the updraft created at the top edge. A 1-meter square area paddle is large enough to fly most walkalong gliders.
Reader's Guide
Walkalong gliding represents a unique intersection of human-powered flight and slope soaring, requiring no external wind. Its significance lies in demonstrating that a person can sustain a model aircraft in flight solely through the ridge lift generated by a moving paddle, hands, or forehead. The concept has been patented, and specific named designs such as the air surfer, the windrider, the tumblewing, and the follow foil have been developed. The practice is distinct from dynamic soaring and from ground effect, relying instead on the moving 'hill' of air created by the pilot. The appearance of a functional walkalong glider in the documentary The Flight of the Gossamer Condor links it to the broader history of human-powered flight. The design principles—low wing loading, lightweight materials, and washout for roll control—are clearly established, and the construction of paddles from common materials like corrugated cardboard or foamcore makes the activity accessible. The legacy of walkalong gliding is that it offers a form of flight that is entirely dependent on the pilot's motion, with no need for wind or engines.
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