"Ned Pike" wrote in
:

Well, they're overly complex, they don't fail gracefully, and their
mass fraction stinks. Soyuz/Shenzhou, OTOH, can survive a guidance
failure and ballistic descent (assuming Shenzhou can due to its
obvious Soyuz commonality).

I'm curious - since you are obviously an expert on entry guidance, what
*does* happen to the US space shuttle if primary guidance fails?

grin

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