Re: Shuttle Aerodynamics

Jim in Houston wrote:

On Thu, 20 Sep 2007 22:34:20 -0500, "Jorge R. Frank"
<jrfrank@xxxxxxxxxxx> wrote:


More of a Danny question. I believe they move together during first
stage and for pitch/yaw control during second stage, and independently
for roll control during second stage. But I could be wrong.
Thanks again for the prompt reply. Can you direct me to a site which
discusses such subjects?

Andy Foster has a very good set of web pages on the subject of Shuttle
ascent.
http://www.theandyzone.com/index.html
I think you'll have to ask him to put them back up if you really want to
read them.

The SSME are moved independently, it's the flight control portion of the
On-Board flight software and the mixing logic that transforms the error
signals into gimbal movements. This mixing logic is changed during flight
for various reasons. So, with respect to pitch rate errors, they all move
together because the flight control mixing logic commands them to do it
that way.

Or, google groups sci.space.shuttle, there are plenty of good discussions in
the past about this subject.
--
Craig Fink
Courtesy E-Mail Welcome @ WeBeGood@xxxxxxxxx
.

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