Launcher Option 2: Space Shuttle and Titan
Using one Space Shuttle launch and a Titan IV cuts
the cost of launch, and still uses solely American launchers. It saves $100 M
from one of the launches, as the Titan IV is (only) $300 M. The Titan IV
also has a slightly larger payload shroud than the Space Shuttle, which is
very useful when handling low-density cryogenic hydrogen. Also, the Titan
is able to carry cryogenics, which is a hole in the all-Shuttle plan.
At a total cost of at least $700 M, this is still a very expensive
launch setup. Having one of the launchers not man-rated (the Titan has
mediocre reliability) reduces the flexibility of launching the
crew. The lack of a second mission with a Remote Manipulator
System, and the flexibility of a flight crew present adds to mission risk
and detracts more from flexibility.
The Titan IV has a lower payload capacity than the Space Shuttle, and we will in
all likelihood need another small launch, or sacrifice significant mission
objectives. A Titan III is another $100 M, and has a capacity of 26,000 lbs
The Titan IV has a payload of about 48,000 lbs (22,000 kg), and the
Space Shuttle, 55,000 lbs (25,000 kg) [which may be upgraded to about
62,000 lbs (28,000 kg)]. This gives a total capacity of
103,000 - 110,000 lbs (47,000 - 50,000 kg). This is just borderline
feasible for the manned mission in terms of payload capacity, and it is
likely another small launch would have to be booked. For another $100 M, a
Titan III could be
bought, which would bring total payload capacity up to a nice 129,000 -
136,000 lbs (59,000 - 62,000 kg), but for a whopping $800 M.
| Launcher || Payload || Cost|
| Shuttle + Titan IV || 103,000 lbs (47,000 kg) || $700 M |
| Shuttle (upgrade) + Titan IV || 110,000 lbs (50,000 kg)|| $700 M |
| Shuttle + Titan IV + Titan III || 129,000 lbs (59,000 kg)|| $800 M |
| Shuttle (upgrade) + Titan IV + Titan III || 136,000 lbs (62,000 kg) || $800 M|
Although it has a higher payload than the two Shuttles option, it lacks a
second man-rated launch and adds the complexity of a second rendezvous, and
it is no cheaper, so this is an unlikely scenario.
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