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Re: pteros have lift-off
On Jan 13, 2009, at 7:00 AM, jrc wrote:
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.
Jim, Jim, Jim,
Don't be silly.
----- Original Message ----- From: "David Peters"
To: "jrc" <firstname.lastname@example.org>
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
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?