Walkalong glider

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Person flying a Walkalong glider.

A walkalong glider is a lightweight, slow-flying model aircraft designed to be kept aloft by

slope soaring in that the orographic lift (or "hill
") is following the plane as it flies in the air and thus no other wind is required.

Types of walkalong gliders have been patented.

windrider, the tumblewing and the follow foil.[3]

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.

History

The first description of a walkalong glider appears in the 1955 patent of J. E. Grant.

Academy Award winning documentary The Flight of the Gossamer Condor.[5]

Walkalong glider design

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

balsa wood sticks and tissue paper.[10][11]

The paddle should be made from a sheet of light weight 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.

See also

External links

References

  1. ^ US Patent 2718092 Joseph E Grant 1950 - "A virtually vertical baffle is then moved beneath the airplane in a direction transverse to the plane of the baffle and in the desired direction of flight... gives rise to an updraft and the airplane rides along..."
  2. ^ US Patent 5100357 Mcready et al. 1992. Refers to Grant's later patent - "A toy airplane is launched; and an air flow deflecting surface is located in spaced relation to a V-shaped, swept-back wing of the airplane to deflect air flow generally upwardly toward the flight path of the airplane to aid in sustaining or balancing its flight. That surface is movable relative to the wing, and may be hand-held beneath the flying wing..." -- This patent adds details to the construction of a walkalong glider which will fly in a swooping tilt after each "boost".
  3. ISBN 978-1580085779
    .
  4. ^ Method of Flying Toy Airplane and Means Therefor
  5. ^ Walkalong Glider Inventor's Interview Page and New Directions
  6. ISBN 978-0071790550
    .
  7. ^ Rossoni, P. Youtube video titled "Comparison of Tumblewings Made from Different Weight Paper." ,2012
  8. ISBN 978-0071790550
    .
  9. ISBN 978-0071790550
    .
  10. ^ Aronstein, D. youtube video titled "Model B-17 Flying Fortress Walkalong Glider", 2008
  11. ^ Rossoni, P. Web page titled "Stick And Tissue Model Aircraft" , 2011
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