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Re: was Arcjet, now solid boosters



Firing solids on orbit is going out of style, and may even be considered
"bad manners".  Check out
http://sn-callisto.jsc.nasa.gov/newsletter/v2i2/v2i2-2.html#news3

de KM1P

----- Original Message -----
From: "Drew Glasbrenner" <glasbrenner@mindspring.com>
To: "amsat-bb" <amsat-bb@AMSAT.Org>
Sent: Monday, June 04, 2001 6:10 PM
Subject: [amsat-bb] was Arcjet, now solid boosters


> This is not my field of expertise, but here goes. Seems to me that
multiple
> solid boosters is a BAD idea. What if one of a pair fires but not the
other?
> Another tumbling satellite is what we will have. Also, assume the rate of
> catastrophic failure for similarly designed motors, large or small, is
> equitable. Several small motors will greatly increase the risk of a
failure
> as opposed to one or two. I believe this is the logic behind the recent
> trend of newer intercontinental aircraft having two instead of four
engines.
>
> This IS rocket science, and while it is fun to listen to some of the
ideas,
> I'd rather trust the guys who do this for a living with my satellite
money.
>
> Drw, KO4MA
> ----- Original Message -----
> From: Tom Blubaugh <mjrtom@home.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Monday, June 04, 2001 5:47 PM
> Subject: Re: [amsat-bb] Arcjet Motor
>
>
> > Hi James, Greg and All:
> >
> > I had an idea:
> > Get lets say 7 (could be more or less) smaller solid rocket
> > motors ( 6 around 1 in the middle).Set up the attitude of the satellite.
> > Fire off the 1st set of outside 2 motors. Evaluate orbit. Change
> > attitude if neccessary. Fire off the 2nd set of 2 outside motors.
> > Reevaluate orbit. Change attitude if neccessary.  Fire off 3rd set
> > of 2 or if smaller boost is needed, use the one in the middle
> > or save the rest for later use.
> > This was one example. This way you can set up any different combination
> > of motor ignition for different amounts of thrust needed as long as an
> > even number (2,4,6) of outside opposing motors are burned at the
> > same time. This I think would help keep the thrust at the C/G of the
> craft.
> >
> > Could this work or am I missing something?
> >
> > Just a thought...I'm here to learn.
> >
> > 73
> > Tom / N7HXP
> > mjrtom@home.com
> >
> > ----- Original Message -----
> > From: "James Sharp" <jsharp@psychoses.org>
> > To: "Greg D." <ko6th_greg@hotmail.com>
> > Cc: <amsat-bb@AMSAT.Org>
> > Sent: Monday, June 04, 2001 11:37 AM
> > Subject: Re: [amsat-bb] Arcjet Motor
> >
> >
> > >
> > > Yeah, you could, but then you'd have to start comprimising on orbital
> > > changes if you need them.  Example:  Do you a) increase the orbital
> > > inclination to 68 degrees, b) adjust the perigee by 4000km, or c)
change
> > > the inclination to 45 degrees and adjust the perigee by 2000km.
> > >
> > > And adjusting multiple orbital parameters in one burn can get more
than
> a
> > > little hokey.
> > >
> > > > Could we do the orbit change in one burn, using a solid motor?
> > > > Very reliable, light weight, good thrust.
> > > >
> > > > I'd still put the ArcJet on board, for tweeks.
> > > >
> > >
> > > ----
> > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

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