Author Topic: Agena upper stage  (Read 24088 times)

Offline Blackstar

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Agena upper stage
« on: 03/09/2009 07:43 PM »
We were having a discussion on another thread (threads?) about the Agena.  I mentioned that I had a copy of an early 1970s era congressional hearing devoted to several variants of Space Tug, including Agena options.

Attached is the second half of that hearing doc.  Sorry about the poor quality of the scan; I had to photocopy the original doc and the scan of the photocopy loses detail.  Scanning the original would be rather laborious.

I'll post part 1 here in a few days.  Requires a lot of standing over a copier machine.

I've also located my other Space Tug and Agena upgrades documents and can scan those as well.

Offline Analyst

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Re: Agena upper stage
« Reply #1 on: 03/10/2009 07:29 AM »
A study about using a modified Agena as upper stage for STS.

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Offline Blackstar

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Re: Agena upper stage
« Reply #2 on: 03/10/2009 04:15 PM »

Offline Blackstar

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Re: Agena upper stage
« Reply #3 on: 03/10/2009 04:15 PM »

Offline Blackstar

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Re: Agena upper stage
« Reply #4 on: 03/10/2009 04:15 PM »

Offline Blackstar

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Re: Agena upper stage
« Reply #5 on: 03/10/2009 04:16 PM »

Offline Blackstar

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Re: Agena upper stage
« Reply #6 on: 03/10/2009 04:17 PM »

Offline Blackstar

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Re: Agena upper stage
« Reply #7 on: 03/10/2009 04:20 PM »
Not everybody wants to read stuff.  Here are some line drawings excerpted from the Agena B study that show several payloads scheduled to fly, including:

Samos 1/2
Midas
Samos E-5
Samos E-6
SNAPSHOT
Advent (comsat, never built)

Offline Art LeBrun

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Re: Agena upper stage
« Reply #8 on: 03/10/2009 05:00 PM »
Many thanks, Dwayne. Out of the dark into the light........appreciate
the time and effort.
1958 launch vehicle highlights: Vanguard TV-4 and Atlas 12B

Offline gwiz

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Re: Agena upper stage
« Reply #9 on: 03/10/2009 07:09 PM »
Interesting to note from the Agena B Standardization Study that the Program 102 vehicles (Samos-F2 ferrets) didn't have solar power.

Offline Blackstar

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Re: Agena upper stage
« Reply #10 on: 03/10/2009 08:20 PM »
Many thanks, Dwayne. Out of the dark into the light........appreciate
the time and effort.

Glad there's something you find interesting.  I think I owe you one, or two, or three, for your past help.
« Last Edit: 03/10/2009 10:54 PM by Blackstar »

Offline Art LeBrun

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Re: Agena upper stage
« Reply #11 on: 03/10/2009 08:28 PM »
Many thanks, Dwayne. Out of the dark into the light........appreciate
the time and effort.

Glad there's something you find interesting.  I think I owe you one, or two, or three, for you past help.

I downloaded 7 pdf so I now "owe" you.....this is a great site to share
and exchange.
1958 launch vehicle highlights: Vanguard TV-4 and Atlas 12B

Offline Analyst

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Re: Agena upper stage
« Reply #12 on: 03/11/2009 08:27 AM »
What satellite do we see on page 155 (pdf page 11) of the first document "SpaceTugPart2.pdf"?

Is this just a generic satellite sketch or could it be a SDS-1 satellite? It looks like an Intelsat 4 based bus and shows an Ascent Agena on Titan 3B. I remember some articles (Spaceflight magazine) by Blackstar, but I am pretty sure they did not include pictures of SDS-1 (but some of SDS-2 based on the Intelsat 6 bus).

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Offline gwiz

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Re: Agena upper stage
« Reply #13 on: 03/11/2009 01:47 PM »
What satellite do we see on page 155 (pdf page 11) of the first document "SpaceTugPart2.pdf"?

Is this just a generic satellite sketch or could it be a SDS-1 satellite? It looks like an Intelsat 4 based bus and shows an Ascent Agena on Titan 3B. I remember some articles (Spaceflight magazine) by Blackstar, but I am pretty sure they did not include pictures of SDS-1 (but some of SDS-2 based on the Intelsat 6 bus).

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I've seen an almost identical drawing, but with a different payload, a satellite with an array of small dish antennae vaguely like the Eutelsat I series.  Perhaps Lockheed produced these drawings when bidding for launch contracts and the one in the Space Tug presentation actually is an Intelsat IV.

Offline Analyst

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Re: Agena upper stage
« Reply #14 on: 03/11/2009 02:23 PM »
Interesting to note from the Agena B Standardization Study that the Program 102 vehicles (Samos-F2 ferrets) didn't have solar power.

Probably the satellites did separate from the Agena and it was only used as an upper stage.

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Offline gwiz

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Re: Agena upper stage
« Reply #15 on: 03/11/2009 04:20 PM »
Probably the satellites did separate from the Agena and it was only used as an upper stage.

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It appears not, as the quoted mission lifetime is several days, compared with the under-an-hour lives of the NASA upper-stage misions.

Offline jcm

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Re: Agena upper stage
« Reply #16 on: 03/11/2009 04:59 PM »
Probably the satellites did separate from the Agena and it was only used as an upper stage.

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It appears not, as the quoted mission lifetime is several days, compared with the under-an-hour lives of the NASA upper-stage misions.

I can confirm that the satellites remained attached to Agena
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline Blackstar

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Re: Agena upper stage
« Reply #17 on: 03/11/2009 05:21 PM »
Two documents on a proposed upper stage in 1963.  The upper stage, named HYLAS, was not built.  One contains references to a secondary propulsion system for Agena.
« Last Edit: 03/11/2009 05:40 PM by Blackstar »

Offline Blackstar

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Re: Agena upper stage
« Reply #18 on: 03/11/2009 05:22 PM »
The first page of an article on the Space Tug for the shuttle.  Also a two page memorandum from 1973 regarding NASA's views on responsibility for building the Space Tug.  It says that they wanted USAF to build it.
« Last Edit: 03/11/2009 05:41 PM by Blackstar »

Offline Blackstar

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Re: Agena upper stage
« Reply #19 on: 03/11/2009 05:25 PM »
Two collections of documents on the Agena.  These are part of the Agena history collection mentioned elsehwere on this site.  These are not the complete collection of Agena documents from that source.  I cherry-picked the best ones.
« Last Edit: 03/11/2009 05:42 PM by Blackstar »

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