Ancient gliders powered via catapult

I vaguely recall a claim somewhere that the Ancient Egyptians, or rather that ancient extraterrestrials showed them, used catapults to give gliders flight. Now, I'm pretty sure that a catapult used to hurl stones is nowhere near as close as a catapult used to send a glider in the sky (I think they're called "slingshots") but if anyone knows what I'm talking about please refresh me. Where did this claim originate? Is it true (at least before the Medieval age) to some extent, if any? What are the strength(s)/flaw(s) with this claim (aside from perhaps maybe the obvious).



Thanks in advance.

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