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Re: starship-design: Re: Starship design
In a message dated 9/30/97 12:54:37 AM, firstname.lastname@example.org (Steve VanDevender)
> > Glad you liked the site. We were trying to inspire people. ;)
> > We did actually consider something like your design called M.A.R.S.
> > (Microwave Augmented Rocket System). In M.A.R.S. a microwave sail was
> > and the microwaves focused back to drive a deceleration rocket. I'm not
> > where we finished with that, but it had two problems. Forst the amount
> > energy causes tremendous waste heat problems. Secound, the sail is so
> > efficent at producing forward thrust, its difficult to generate enough
> > reverse thrust to counteract it. Can't remember if its proponent (Kevin
> > Houston) was ever sure it could slow down?
>As I recall there was a great deal of debate about this, mostly around
>the physically impossible idea of slowing down using beamed power from
>Earth without using reaction mass. If you use some sort of reaction
>mass (and in a real sense, a retromirror is reaction mass -- it gains
>the forward momentum so the payload can lose its momentum) then you can
I'm not sure, but I think your right. Thou for technical reasons a
retro-mirror system, is probably unworkable.
>I suspect that it may be more practical to exploit drag from the
>interstellar medium to decelerate down from high relativistic speeds,
>then use a fusion rocket or the like to do the final braking into the
>target system. Then you need neither beamed power nor to carry extra
>reaction mass that increases power requirements during the boost phase
>of the trip.
I'm not sure, but I think we gave up on using interstellar media for drag?
Probably their just isn't enough of it to be worth using. Anyone remember?
>Of course, this isn't very helpful for the return trip unless the
>travelers can build a boost beam in their target system, but I believe
>that among the other advances needed for interstellar travel, we'll have
>to advance past the notion that explorers should always return from
?! This is an advance? Throwing away a ship and crew to save fuel costs?