Path: utzoo!attcan!uunet!know!samsung!umich!dgsi!gregc
From: gregc@cimage.com (Greg Cronau/1000000)
Newsgroups: sci.space.shuttle
Subject: Re: Liftoff Question
Message-ID: <1990Sep14.072353.7492@cimage.com>
Date: 14 Sep 90 07:23:53 GMT
References: <52900004@uxa.cso.uiuc.edu>
Reply-To: gregc@dgsi.UUCP (Greg Cronau/1000000)
Organization: Cimage Corp, Ann Arbor, MI
Lines: 16

In article <52900004@uxa.cso.uiuc.edu> sfn20715@uxa.cso.uiuc.edu writes:
>
>When the shuttle lifts off, what is used to make it turn and roll?
>(roll/pitch? turn/yaw? you know what I mean...)
>I would assume that the orbiter's aerodynamic surfaces are not used,
>as they are not directly exposed to the air, and its not going
>_that_ fast when it clears the tower and starts the turn, and I would
>assume that the SSME's are not vectored, right?  Which one of these
>is wrong?

The SSME's can be gimbaled(sp?) and the SRB's have the ability to gimbal
their exhaust nozzles a few degrees. The SRB's have thier own onboard
APU's to power the hydralics that drive the nozzle hardware. The SRB's are
*alot* more complicated than a couple of pipes stuffed with Solid rocket fuel.

gregc@cimage.com