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Re: Spacefraft Aerodynamics [was:Re:AO-40: Plansfor April-June 2001]



----- Original Message -----
From: Margaret Leber (K3XS) <maggie@voicenet.com>
To: Douglas Braun & Nadia Papakonstantinou <doug@dougbraun.com>
Cc: <amsat-bb@AMSAT.Org>
Sent: Thursday, April 05, 2001 12:03 PM
Subject: Re: [amsat-bb] Spacefraft Aerodynamics [was:Re:AO-40: Plansfor
April-June 2001]


> Douglas Braun & Nadia Papakonstantinou wrote:
>
> > At the atmospheric pressures where the satellite is, the classic
concepts
> > of "laminar" and turbulent" flow do not hold.  The reason is...
>
> Wow...that's interesting. You mean near-space is *different* from being on
the
> ground? <giggle>
>
> Seriously, thanks for the enlightenment. This stuff is
> *interesting*...presumambly the drag is not *independant* of the
spacecraft
> attitude. But you have to wonder if it acts with any kind of moment arm,
> exerting a turning force that would interfere with changing the
attitude...sand
> how that force would vary with attitude.

You get an aerodynamic torquing force that works on the spacecraft attitude
if the center of mass (the gravity balance point) is offset from the
aerodynamic center of pressure (the aerodynamic balance point).

As attitude  varies, you will often get a shift in the aerodynamic center of
pressure.

73, Ken N2WWD


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