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  Mercury - Gemini - Apollo
  Apollo service module engine (SPS) firings

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Author Topic:   Apollo service module engine (SPS) firings
Fra Mauro
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Posts: 1624
From: Bethpage, N.Y.
Registered: Jul 2002

posted 07-22-2018 02:10 PM     Click Here to See the Profile for Fra Mauro   Click Here to Email Fra Mauro     Edit/Delete Message   Reply w/Quote
I'm sure it was possible but was the Apollo service module engine (SPS) ever fired in tandem with any of the quad thrusters?

indy91
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Posts: 15
From: Germany
Registered: Feb 2016

posted 07-23-2018 03:33 AM     Click Here to See the Profile for indy91     Edit/Delete Message   Reply w/Quote
That was done in many cases actually, but only to settle the propellants for the SPS before a SPS burn. So if the SPS propellant tanks were not 100% full anymore you would fire the RCS for a few seconds shortly before the SPS burn.

But I don't think the RCS was ever fired for the full duration of a SPS burn to shorten the burn duration or so. Wouldn't make much difference because the SPS had a much higher thrust and would so only waste RCS propellant.

All times are CT (US)

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