Ultralight glider
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Glider wings have very high aspect ratios -- their span is very long compared to their width. This is because drag created during the production of lift (known as induced drag) can account for a significant portion of the total drag on a glider. One way to increase the efficiency of a wing is to increase its aspect ratio.
History of Jim Marske Flying Wing - 60+ years designs, experimentation, XM-1 Flying Plank, Pioneer Sailplane, Monarch Ultralight.