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Re: pteros have lift-off

The stroke isn't circular, and wingstrokes don't operate chiefly in the horizontal plane. Wingstrokes are quite a 3-D affair with differences that vary with airspeed and weight and with allometric differences between species. I usually construct the terrestrial manus stance as being somewhat wider than the pedal stance, but that difference isn't particularly significant for any reason having to do with launch. I'm guessing that you are seeing the motions of the forelimb joints during the launch as having a very different locus than Mike and I do.

----- Original Message ----- From: "David Peters" <davidpeters@att.net>
To: "jrc" <jrccea@bellsouth.net>
Cc: <dinosaur@usc.edu>
Sent: Monday, January 12, 2009 9:38 AM
Subject: Re: pteros have lift-off

Like David M says, think of a pterosaur launch as a modified downstroke. The outer wing is already starting to operate as an opening/lifing device as it begins to unfold very early in the cycle.

A little confused here... at the bottom of the downstroke the wings are just coming to the end of a chiefly horizontal segment in their stroke cycle, the south pole of their circular stroke, if you will... unless the wingstroke only operates chiefly in the horizontal plane. Maybe this is the key >> do you envision a manus stance much wider than the pedal stance?