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  Mercury - Gemini - Apollo
  Apollo lunar module: Ascent engine failure (Page 2)

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Author Topic:   Apollo lunar module: Ascent engine failure
Rusty53
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Posts: 50
From: Rochester, NY USA
Registered: Jun 2010

posted 12-27-2018 01:13 PM     Click Here to See the Profile for Rusty53     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Jim_Voce:
Could someone please advise on the correct version of these events and any idea when did Armstrong bring up these concerns?
Armstrong floated the idea of having a manually operated valve as a backup that would allow the hypergolics to flow into the combustion chamber and ignite on contact. No ignition source was needed.

oly
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Posts: 669
From: Perth, Western Australia
Registered: Apr 2015

posted 12-28-2018 06:58 PM     Click Here to See the Profile for oly   Click Here to Email oly     Edit/Delete Message   Reply w/Quote
Reading material from Tom Kelly and others involved in the LM and Assent engine designs, the inclusion of some kind of manual valving that would directly control the introduction and mixing of fuels into the combustion chamber of a rocket engine that had experienced serious combustion instabilities for most of its development phase would not be something anyone would want to entertain.

At some point, the valve design would have to breach the LM pressure vessel, which would require structural mass increase, requires sealing and become a source of potential leak, in it's simplest form would have at least 1 astronaut not standing during the ignition of a rocket engine, and introduce numerous hardware items that required design, manufacture, testing, and approval.

On a vehicle that incorporated chemical milling of parts and Kapton foil insulation to find additional weight savings, installing additional hardware may have pushed the early LM design over the show stopper threshold.

SpaceAholic
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Posts: 4251
From: Sierra Vista, Arizona
Registered: Nov 1999

posted 12-28-2018 08:12 PM     Click Here to See the Profile for SpaceAholic   Click Here to Email SpaceAholic     Edit/Delete Message   Reply w/Quote
Would have required a major redesign of the engine's valve package assembly in order to divert around the dual redundant/parallel valves on fuel and oxidizer feeds and vent systems.


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