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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

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