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  #1  
Old 08-22-2018, 01:19 AM
lgr lgr is offline
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Default Centuri Saturn 1B body tube

Hello,

I'm new to the group, but built and launched a lot of Estes rockets back in the mid-1980s. I've taken it back up and over the past couple months built a few, including a #2001 Saturn V, a #1284 Space Shuttle, and a Dr. Zooch Falcon Heavy.

I recently purchased an old Centuri 1/100 scale Saturn 1B kit (#SA-205) off eBay.
Everything seems to be here, but the largest body tube has been crushed.
I've done some measurements and searched online, and it looks like
the Estes version of this tube is:
BT-82A 2.618 OD x 7.635 long

The ID of mine is 65.6mm or 2.58"
The OD of mine is 66.5mm or 2.618"

Do you think a standard BT-80 (2.560" ID / 2.600" OD) is close enough to
work with my other existing parts? Or do you know of anybody making this
exact tube? Or would I perhaps be better off attempting to repair the
one I have?

thanks,
luther
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  #2  
Old 08-22-2018, 09:15 AM
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ghrocketman ghrocketman is offline
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I just checked Semroc/eRockets for a BT-82.
They don't offer it, which is surprising.
The BT-80 'on paper' looks to be close enough, but someone else would have to confirm.
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  #3  
Old 08-22-2018, 10:06 AM
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turbofireball turbofireball is offline
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The Centuri Saturn 1B, and the subsequent rerelease by Estes (#2048) used Centuri sized body tubes. The main tube should be the eRockets sized ST-27.
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  #4  
Old 08-22-2018, 10:18 AM
BARGeezer BARGeezer is offline
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Quote:
Originally Posted by turbofireball
The Centuri Saturn 1B, and the subsequent rerelease by Estes (#2048) used Centuri sized body tubes. The main tube should be the eRockets sized ST-27.


Specs for the ST-27 do not match the OP's specs:

ST-27 ID 2.674" OD 2.700"

I'm thinking this might have been a specialty tube just for these kits.
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  #5  
Old 08-22-2018, 10:49 AM
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Jerry Irvine Jerry Irvine is offline
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The BT-80 is close. U.S. rockets has a 2.60 x 2.70" tube as well. I am selling Semroc/eRockets saturn 1B's right now for $129.95 + $12 ship in case that is an option. Ever since I have been selling these discontinued produces I have heard numerous stories of people buying them from OOP rocketeers and collectors for less. At NARAM one was sold opened and started for only $65.

Jerry
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Old 08-22-2018, 11:51 AM
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turbofireball turbofireball is offline
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So I got my Centuri Saturn 1B out of storage and here is what the instructions say:

2nd stage body tube - 2-5/8" dia. x 7-9/16" long
Aft body tube - 2-11/16" dia. x 1-13/32" long
Aft body tube spacer ring - 2-5/8" dia. x 1/4" long
Nozzle spacer tube - 2" dia. x 1" long
1st stage fuel tubes - 11/16" dia. x 8" long
1st stage exhaust tube - 1-3/16" dia. x 8.-1/2" long
LEM-SM tube - no dimensions stated

And thanks Jerry for providing us sales info on the Estes/Semroc K-29, which has nothing to do with what we are discussing. We are discussing the Estes #2048/Centuri KS-10 1/100 Saturn 1B. Please stay on topic.
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  #7  
Old 08-22-2018, 12:01 PM
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turbofireball turbofireball is offline
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there are some older discussions about this here:

http://www.oldrocketforum.com/archi...php/t-5065.html

http://www.oldrocketforum.com/archi...php/t-9099.html

the second link has body tube dimensions from John Boren at Estes
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  #8  
Old 08-22-2018, 12:29 PM
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Royatl Royatl is offline
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Quote:
Originally Posted by turbofireball
The Centuri Saturn 1B, and the subsequent rerelease by Estes (#2048) used Centuri sized body tubes. The main tube should be the eRockets sized ST-27.


That may be sized for the engine skirt ring, not the S-IVB. The BT-80 may be "good enough" for that.
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  #9  
Old 08-22-2018, 12:51 PM
lgr lgr is offline
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Thanks for all the replies so far. And it makes me happy to know that my first question here is one that isn't straightforward to answer
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  #10  
Old 08-22-2018, 01:34 PM
BARGeezer BARGeezer is offline
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Since the BT-82 tube is not currently available your best shot is to try and see if a BT-80 will work. At worst, you'll have an extra body tube for scratch building. Good thing that's the only tube damaged. In looking at John Boren's list of parts, they all are odd sizes/specialty tubes: BT-82, BT-58, BT-54, BT-83, BT-67, BT-18.

Guess the goal was an accurate 1/100 scale representation. Good luck.

P.S. How badly crushed is the tube? pics?
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