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  Mercury - Gemini - Apollo
  Apollo 13 S-II inboard (center) engine shut down

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Author Topic:   Apollo 13 S-II inboard (center) engine shut down
Fra Mauro
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Posts: 1624
From: Bethpage, N.Y.
Registered: Jul 2002

posted 12-30-2014 09:32 AM     Click Here to See the Profile for Fra Mauro   Click Here to Email Fra Mauro     Edit/Delete Message   Reply w/Quote
How close was the mission to being aborted during the launch phase as a result of the second stage center engine shutdown?

Would the early shutdown of the engine increase the g forces or the pogo oscillations on the crew to a dangerous extent? Most accounts play down this part of the mission as a minor hiccup.

Jim Behling
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Posts: 1488
From: Cape Canaveral, FL
Registered: Mar 2010

posted 12-30-2014 02:41 PM     Click Here to See the Profile for Jim Behling   Click Here to Email Jim Behling     Edit/Delete Message   Reply w/Quote
It wasn't close to an abort and the g loads were reduced by 20%. It would negate any pogo effects since the thrust was reduced. Margins were reduced due to the lost of the engine but that is what happens when you lose redundant systems.

Fra Mauro
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Posts: 1624
From: Bethpage, N.Y.
Registered: Jul 2002

posted 12-31-2014 03:21 PM     Click Here to See the Profile for Fra Mauro   Click Here to Email Fra Mauro     Edit/Delete Message   Reply w/Quote
That's what I thought but John Young made it sound more dramatic in his book.

Tom
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Posts: 1610
From: New York
Registered: Nov 2000

posted 01-01-2015 08:06 AM     Click Here to See the Profile for Tom   Click Here to Email Tom     Edit/Delete Message   Reply w/Quote
If it wasn't for the "major hiccup" two days later, the second stage issue may have received more attention.

Paul78zephyr
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Posts: 678
From: Hudson, MA
Registered: Jul 2005

posted 01-04-2015 09:09 AM     Click Here to See the Profile for Paul78zephyr     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fra Mauro:
That's what I thought but John Young made it sound more dramatic in his book.
It's interesting that Young discusses it in his book because Jim Lovell in 'Lost Moon' doesn't mention it at all. It was in the movie 'Apollo 13' but not in the book (at least the original 1994 edition). I've always thought it very odd that that 'glitch' was left out of 'Lost Moon'.

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