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Re: RE: starship-design: Pellet track
In a message dated 8/18/97 4:25:11 PM, firstname.lastname@example.org (L. Parker)
>Just a general observation for everyone to think about...we are doing this
>Kelly and Isaac were (are) having a conversation from which this is
>>>Assuming a .1% percentage, a rocket with a 10:1 thrust/weight ratio
>>>and 1 millions sec Isp would be absorbing 10^12 watts/kg in waste
>>>heat. Without massive heat rejection systems (which would adversely
>>>affect the thrust/weight ratio), that's going to melt the rocket in
>>>a fraction of a second.
>>>Therefore I don't consider the Bussard Votage compressions system
>>>to truly offer a plausible chance at such high thrust/weight ratios,
>>>considering how various components are directly impacted by fusion
>>>products (thus implying a significant waste heat problem).
>>Actually the Bussard system use anti-nutronic fuels that convert virtually
>>all the power of the fusion reaction into the kinetic energy of the charged
>>waste particals. Efficency is about 99.9+%. (give or take). Most of the
>>waste can just be vented to the sides.
>There is a great deal more, but the relevant parts have already been stated.
>First, any sort of rocket propulsion capable of propelling a starship needs
>ISP of about 1 million give or take a few.
>Second, any such propulsion system is going to generate waste heat.
>Third, it is fairly likely that the total thermal gain to the ship is going
>be significant, NO MATTER WHICH SPECIFIC DRIVE YOU USE.
>Fourth, the ship will be subjected to this temperature continuously for
>long periods of time and will therefore also be subject to thermal and
>There are no metals, alloys, ablatives, or EM fields currently available to
>with this thermal gain. It will occur with fusion drives, plasma drives,
>drives and antimatter drives. It will even occur with Kyle's ZPE drive. So
>reverse engineer this thing. Start by assuming a particular metal alloy for
>skin of the ship, determine its melting point, divide by two for a safety
>now; what efficiency is NECESSARY in order to get an ISP of 1 million
>exceeding the figure we just arrived at? Can we design a and build a drive
Good point but a little misstated. The specific impulse isn't related to the
heat load. And the question is what is the heat gain, and the wait of te