Re: 10 meter diameter CaLV


"jonathan" <Write@xxxxxxxxxxx> wrote in message
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"Douglas Holmes" <noholmesdgspam@xxxxxxxxxxx> wrote in
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Leave it to NASA
If there is an easy way and a hard way they choose the hard way.

All that just so they can have one launch instead of two.

Huh?

They *are* going to have two launches - one CLV and one CaLV.

NASA calls it 1.5 launches.

Regardless of the nomenclature, your objection still makes no sense.

If NASA increases the number of launches they can use:
4 segment solid rockets already in production.
The existing fuel tank.
RL-10 engines for the upper stage also aready in use.

If they stick with the current architecture they need:
NEW 5 segment solid rockets
NEW taller wider fuel tank
NEW upper stage engine.


The first rocket is much easier to design and build then the second.
NASA is choosing the second or the hard way.


If we were to build two new launchers, one for manned and
the other heavy lift /without/ the requirement of a moon mission.
But for earth orbit missions only, what would be the best
design then?



Very interesting question.
To answer that fully I would need more info on what NASA is planning.

Based on the existing space station or a simple follow on:
Most of the modules are only about 12.5 tons docking equipment
would take that up near 20 tons.
No design needed the existing EELVs can handle it.
Although you would probably want to get them to upgrade
the upper stage to two RL-10s.


What about a manned booster?

Based on a 6 man station shared with the Russians

EELVs can easily handle that as well.

A Soyuz only masses a little more then 7 tons for three people.
The smallest EELV the Delta IV medium can lift almost 9 tons to ISS.
With a duel RL-10 it would be over 11 tons to ISS.


.

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