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Re: pteros have lift-off


It should also be understood, and I'll say it again. I can accept a quad lift-off for Q. sp. and northropi. Those taxa are no longer the issue. I'm interested in the pterosaurs with shorter legs, weaker pectoral girdles and much, much longer wings.

I understand your expertise in Q. And, uh, since this is a forum, I've kept my questions on the simple side, understanding that the flight stroke is complex, but certain segments of it, such as when the wings are vertical, or nearly so, during terrestrial locomotion and immediately following a lift-off, are simple.

All I want now is minimum flight speed and apogee as a multiple of the unit specified by CG height at the beginning of the leap. Been gone all day. No reply, so far, to those queries.


On Jan 13, 2009, at 8:07 AM, jrc wrote:

Actually, we did it for the TMM replica by the rather unscientific method of averaging the allometric lengths of the humerus and r/u, which gave us a number on the approximate order of 2.05. One of the reasons that we've continually reiterated that that replica is intended for viewing, not scientific research. So, no -- it wasn't isometric, though 2.05 is within 5%. The Qn torso depth ratio is different -- it is controlled by the dp ratio due to the precise relationship between the dp crest and the coracoid flange. Remember that with the exclusion of the wing, I was the one who generated the long bone dimensions used to construct the missing bits of the TMM replica, so whether they're right or wrong -- I know exactly how they were developed.

----- Original Message ----- From: "David Peters" <davidpeters@att.net

I'll bet you a beer determining torso length in Q. northropi from Q. sp. is essentially isometric, multiplying within 5% of exactly isometric. Which is negligible.

David Peters davidpeters@att.net