This is something we’re after.
Kind of a sled ride- a winch or auto tow launch?
Probably a winch, but I don’t know anything about the video besides what you see there, and another video where a roughly similar vehicle flies with an engine.
Some Dutch company is developing a winch with polyethylene (spectra / dyneema) wire that allow winching really high, say 1 km instead of 300-600 m.
Mike Sandlin has a good info site on “air chairs”, or slow cheap build-it-yourself gliders, he has designed and built quite a few:
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