low tech rockets...

William George Herbert:

<about his revised low tech rockets>

You give a TL8 LH rocket a specific impulse of about 428.  Why?  The
SSME has a specific impulse of 450+.

The resistojet has a specific impulse of 18 here.  Again, why?  There is
not really any upper limit to such with enough power, and according to my
steam tables, the steam at 232C should have a specific impulse approaching
190, depending on the nozzle design.

Your fusion rocket (experimental) has an Isp of 51,400+.  Your TL9 version

has an Isp of 50,100+.  Why does the production version have LOWER Isp
than the experimental?  And why are the performances so low?  Admittedly,
a fusion rocket is pretty open-ended as far as performance, but I have
seen studies that concluded that a fusion rocket could have an Isp in
the range of 1,000,000 or more.

And why are you using liquid Xenon and such for your ion drives, instead

of cadmium, which has a density of 8.65?

For that matter, why do you assign a density of 1.0 for rocks?  Very few
rocks float, even fewer have neutral bouyancy.  Most seem to have a
density in the range of 2-3.

Later...

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[email removed]

I have learned to use the word "impossible" with the greatest caution.
                                    --W. von Braun