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Re: Of course nonavian dinosaurs could fly - duh

Ground effect follows the Biot-Savart law and thus has no ceiling, though it does become relatively inconsequential when HAG is much more than a semi-span. Primary effect is a reduction in induced drag when close to the ground, thereby requiring relatively less power to maintain level flight.

----- Original Message ----- From: "evelyn sobielski" <koreke77@yahoo.de>
To: <dinosaur@usc.edu>
Sent: Sunday, September 27, 2009 8:10 AM
Subject: Re: Of course nonavian dinosaurs could fly - duh

The ground effect establishes a ceiling (perhaps a meter above ground) that is tough to break from below - even if you could glide-hop a bit, that does not mean that you were able to become free-flying (even free-gliding), because as soon as you get out of the ground effect "cushion", sustaining airborneness becomes suddenly much tougher.