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  Possible Atlas 113-D part from Mercury-Atlas 8

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Author Topic:   Possible Atlas 113-D part from Mercury-Atlas 8
Skytrotter
Member

Posts: 19
From: Indianapolis, IN USA
Registered: Sep 2013

posted 09-03-2013 06:48 AM     Click Here to See the Profile for Skytrotter   Click Here to Email Skytrotter     Edit/Delete Message   Reply w/Quote
I purchased several Rocketdyne items from Norton Sales on July 23, 2013.

One particular part has a tag on it that states "Removed from 113D." The sales person from Norton Sales thought it might be from an Atlas missile, but wasn't sure.

Of course Atlas 113-D was the Atlas that launched Wally Schirra on his Mercury Sigma 7 mission in October 3, 1962.

I've done some Internet research to see if there is any mention of a valve being replaced on 113-D, but the only reference I could find that mentioned a part replacement was a valve on the Mercury capsule, and I doubt that would have been a Rocketdyne part.

I assume that this Rocketdyne valve was related to the engines or the missile/engine interface, but I haven't found any good photos or documents on the "boat tail" end of the Atlas. Because of the boat tail end is covered with a insulation blanket, good photos of the engine/missile interface are rare. It is possible that this valve was removed at Convair long before the missile was shipped from the factory.

Any help in locating information about this part would be greatly appreciated!

Several photos and part/serial numbers are located at this site. — Mark Trotter

Lou Chinal
Member

Posts: 1089
From: Staten Island, NY
Registered: Jun 2007

posted 09-04-2013 01:53 PM     Click Here to See the Profile for Lou Chinal   Click Here to Email Lou Chinal     Edit/Delete Message   Reply w/Quote
I am familiar with diagrams of the Atlas plumbing but as far as looking at a certain valve or part, I don't know.

My best guess is to call Paul Thomarios of Akron Oh. He restored #D-152 a few years ago.

ApolloEra
Member

Posts: 13
From: Woodland Hills, CA, USA
Registered: Feb 2013

posted 09-11-2013 02:44 AM     Click Here to See the Profile for ApolloEra   Click Here to Email ApolloEra     Edit/Delete Message   Reply w/Quote
Welcome to collectSPACE and the adventure of rummaging through a dark and dusty warehouse! I live about 15 miles from Norton and visit every month or two. That's an great find... I'm more of an Apollo guy so unfortunately I can't help you too much with this one. The part doesn't look familiar, but the 113-D sounds like a strong possibility. Keep us posted...

Skytrotter
Member

Posts: 19
From: Indianapolis, IN USA
Registered: Sep 2013

posted 10-26-2013 06:44 PM     Click Here to See the Profile for Skytrotter   Click Here to Email Skytrotter     Edit/Delete Message   Reply w/Quote
I have no real new information on this item, however I did do a little more research on the information on the tag that is attached to the valve.

Writing on the tag attached to the valve states...

Removed from 113D
Per R1079-53
GMA- ECP MA2-41

I still assume that "113D" refers to the Atlas D of Wally Schirra's Mercury-Atlas 8 - Sigma 7.

I did find a few documents that suggest the "ECP" stands for "Engineering Change Proposal" and that "MA2" is the booster engine cluster of the Atlas D, otherwise known as XLR89-5. Perhaps "MA2-41" is a specific engine number.

My understanding is that the Atlas D used a single turbo pump to provide fuel and oxidizer to both booster thrust chambers. I believe the sustainer engine had its own turbopump since the booster engines were jettisoned in later in flight. See: XLR89-5.

I have not found any references to what "Per R1079-53" might mean. Perhaps this is a directive to remove this part from the Atlas while it was at Convair or while the engine was at Rocketdyne. If the "Removed from 113D" refers to the Atlas D, then it seems that the part would have been removed at Convair.

Skytrotter
Member

Posts: 19
From: Indianapolis, IN USA
Registered: Sep 2013

posted 10-17-2014 04:32 PM     Click Here to See the Profile for Skytrotter   Click Here to Email Skytrotter     Edit/Delete Message   Reply w/Quote
Since I originally posted this over a year ago, I thought I'd bump this to the top in case any new members had any information or contacts to someone that might have information on this valve.

Any help would be appreciated.

mikej
Member

Posts: 415
From: Germantown, WI USA
Registered: Jan 2004

posted 10-23-2014 05:11 PM     Click Here to See the Profile for mikej   Click Here to Email mikej     Edit/Delete Message   Reply w/Quote
I agree that "ECP" likely means "engineering change proposal" in this context, but it seems more likely that "MA2-41" is the number of the ECP.

Some common Rocketdyne F-1-related documents have a list of engine modifications. The table listing these modifications has columns for "Approved ECP No.", "MD No.", and the date of the manual describing engines containing the change. The approved ECP numbers for the F-1 are of the form "F1-57", so it would seem likely that "ECP MA2-41" indicates that it's the 41st ECP for the MA2 engine.

Just a wild guess regarding "per R1079-53," but many Rocketdyne manuals begin with R, have 4 digits, and may optionally have a dash with additional digits. For example, "R-3896-6" is the Rocketdyne manual regarding F-1 Rocket Engine Thermal Insulation Installation and Repair.

Of course, there's no dash between the leading 'R' and the four digits (which might be rationalized away by saying that someone was being a bit informal on a hand-written tag). Harder to rationalize away would be the "-53", when the (presumably more complex) F-1 only had 11 manuals in its series.

On the other hand, many approved ECPs were retrofitted onto already-manufactured and already-installed engines. Presumably, there'd be some manner of instructions accompanying the retrofit kit, which might well have a document number such as "R1079-53". (Unfortunately, I have no copies of any Rocketdyne retrofit instructions, so this is pure speculation on my part. Pratt & Whitney went with the more straightforward method of using names like "RL10A-3 Engine Service Bulletin No. 51".)

Lou Chinal
Member

Posts: 1089
From: Staten Island, NY
Registered: Jun 2007

posted 10-24-2014 12:38 PM     Click Here to See the Profile for Lou Chinal   Click Here to Email Lou Chinal     Edit/Delete Message   Reply w/Quote
Good going, Skytrotter and mikej.

Joel Katzowitz
Member

Posts: 450
From: Marietta GA USA
Registered: Dec 1999

posted 10-24-2014 03:58 PM     Click Here to See the Profile for Joel Katzowitz   Click Here to Email Joel Katzowitz     Edit/Delete Message   Reply w/Quote
I feel your pain Skytrotter. I've got a couple of what I believe are Atlas parts that I'm also trying to ID with little to no luck. Circumstantial evidence suggest my components came from Atlas 50-D, the launch vehicle for MA-1.

Good luck!

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