The wind socks on Delaware's Du Pont airport hung limp and damp. The sun was pale through the heat haze. A plane flying less than 15 ft. off the ground churned through the air toward two uprights, like football goal posts, set up on the airport. Squatting under the plane's line of flight was a glider, tethered to a rope which looped in a big "U" over the two posts and back to the plane. The plane swooped in. hooked the rope. The glider shot aloft, trailing.
Thus tested and proved last week was the...
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