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Old March 1 2013, 06:54 PM   #70
gturner
Admiral
 
Location: Kentucky
Re: manned Mission to Mars discussion

JanewayRulz! wrote: View Post
IIRC, they also discuss the heat of earth re-entry from such a high speed descent is greater than any current heat shield protection would allow.
Dragon's heat shield is already designed for Mars re-entry. Using PICA or PICA-X it's not much of a problem.

The entry velocity would be between 15 and 21 km/sec, versus a lunar entry velocity of 11 km/sec or a low-orbit entry velocity of 7.9 km/sec, and the re-entry window is easy to hit even with mid-1960's technology.

1966 NASA report on re-entry from Mars
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