An interactive steady-state model of a kite on a flexible tether. The flying line's own weight and cross-flow drag are part of the force balance, so the line bows and helps set the elevation angle. Verified against three exact closed forms. Independent reimplementation; runs entirely in the browser and spends no credits. Sources: NASA Glenn's Beginner's Guide to Kites, NASA CR-3622, and the airborne-wind-energy tether-drag literature, all credited in CREDITS.txt.

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