Kirby Radar Kite

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Slingsby Kirby Kite prototype - Shuttleworth Airshow 2023 > .

Kirby Radar Kite

"Almost all the Kirby Kites still flying at the outbreak of World War II were impressed into the Royal Air Force for use as training aircraft for assault glider pilots. Kirby Kites were also used, along with other types of glider, to assess the ability of the Chain Home radar system to detect aircraft largely constructed of wood. These tests carried out over the English Channel were successful in showing that even gliders with very little metallic content could be detected, though the strength of return depended on how much metal was on board. After use by the Glider Training Schools the surviving Kirby Kites were passed to the Air Training Corps. Seven complete Kirby Kites survive, plus another that had no wings. New wings have been built for this Kite."
https://en.wikipedia.org/wiki/Slingsby_Kite