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  #11  
Old 01-08-2019, 10:46 PM
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Tau Zero Tau Zero is offline
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Thumbs up Plunging ahead...

I'm starting with the Centuri information from the "Classic Kit" listing on the old Semroc page.

I'll need to cross-reference it with JimZ and Ye Olde Rocket Plans, as well.

I'll no doubt need help to fill in any knowledge gaps I run into.
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Jay Goemmer
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NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #12  
Old 01-10-2019, 02:09 AM
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Tau Zero Tau Zero is offline
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Question Centuri ST-8 tubes galore

Quote:
Originally Posted by Tau Zero
I'll no doubt need help to fill in any knowledge gaps I run into.

Okay, here's my first call for help.

I'm looking for assistance with the following Centuri kits:


1) Arrow 300

a) Are the body tubes ST-8 (dia. is listed as 0.91, so probably)?

b) How long is the main body tube, and are the first two stages 3" long?


2) Excalibur 2

I suspect the first stage is actually a No. 8 Booster Unit KBB-8.

a) Is the booster's outer body tube 3" long?


3) Flutter-By

The Centuri version appears to be ST-8, with an ST-7 motor tube. Can you confirm or deny this?

Thanks in advance for any help you can give.

.
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
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NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #13  
Old 01-10-2019, 09:30 AM
BARGeezer BARGeezer is offline
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1. From JimZ's: http://www.spacemodeling.org/jimz/centuri/cen5037.txt
2. From the Semroc website: http://www.semroc.com/Store/scripts...arts.asp?ID=570
3. From YORP: http://www.oldrocketplans.com/centu...-9/Cen_KA-9.pdf
Header card says .908" dia. That would be an ST-8. And the motor tube would be an ST-7.
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  #14  
Old 01-10-2019, 07:08 PM
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Earl Earl is offline
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I have an unopened Excaliber II and I can confirm that the booster stage bodytube is 3".

I suspect too that the booster stage is the #8 booster kit that Centuri sold as a separate item, but the parts in the bag are all 'loose'; in other words, that 'kit' of parts for the booster does not appear as a 'separate' bag inside the main kit bag.

Earl
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  #15  
Old 01-10-2019, 11:27 PM
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Tau Zero Tau Zero is offline
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Quote:
Originally Posted by BARGeezer
3. From YORP: http://www.oldrocketplans.com/centu...-9/Cen_KA-9.pdf
Header card says .908" dia. That would be an ST-8. And the motor tube would be an ST-7.

The "fine print" is at the top of the Flutter-By page:

Outside Body Tube: Centuri ST-8 3.0" long
Inside Body Tube: Centuri ST-7 3.0" long
Nose Cone: PNC-80 2" plus shoulder


BARGeezer, thanks for all three of those links! I appreciate it!

Cheers,
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
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NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #16  
Old 01-10-2019, 11:31 PM
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Quote:
Originally Posted by Earl
I have an unopened Excaliber II and I can confirm that the booster stage bodytube is 3".

I suspect too that the booster stage is the #8 booster kit that Centuri sold as a separate item, but the parts in the bag are all 'loose'; in other words, that 'kit' of parts for the booster does not appear as a 'separate' bag inside the main kit bag.
Earl,

After looking closer at the #8 booster instructions, is there an HTC-7B connector (the one that goes *outside* the ST-7 tube) in your Excalibur II, as opposed to an HTC-8, as well?

Please advise. Thanks!
.
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
Semroc SAM #0029
NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #17  
Old 01-11-2019, 12:42 AM
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Earl Earl is offline
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Quote:
Originally Posted by Tau Zero
Earl,

After looking closer at the #8 booster instructions, is there an HTC-7B connector (the one that goes *outside* the ST-7 tube) in your Excalibur II, as opposed to an HTC-8, as well?

Please advise. Thanks!
.


Jay -

Interesting: there does NOT appear to be an HTC-7B in the kit bag. I looked 'inside' the larger #8 tube, the #7 to #8 plastic connector, etc. just to make sure it wasn't hiding somewhere. Again, this is a sealed kit, but I think if that Passport staging connector was in the bag, it would be visible.

The #8 tubing connector to otherwise connect the two stages together WAS in the bag.

Earl
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  #18  
Old 01-11-2019, 12:49 AM
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Tau Zero Tau Zero is offline
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Quote:
Originally Posted by Earl
this is a sealed kit, but I think if that Passport staging connector was in the bag, it would be visible.

The #8 tubing connector to otherwise connect the two stages together WAS in the bag.
Earl,

Okay, thanks! I'll add that to this body tube list.

Cheers,
.
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
Semroc SAM #0029
NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
Reply With Quote
  #19  
Old 01-24-2019, 09:57 PM
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Tau Zero Tau Zero is offline
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Quote:
Originally Posted by Tau Zero
I'll no doubt need help to fill in any knowledge gaps I run into.
Today I'm looking for body tube lengths for the Centuri "Argus" 5039 / KB-9.

I remembered I had the attached PSR-78 reducer and body tube included in a multiple nose cone purchase from Mike Hellmund way back in 2001.

The ST-7 body tube is 6.0” long.

I had this one "back in the day," so I know that the two other tubes are ST-8 and ST-13, but I'm not sure exactly how long they were.


Looking at the attached .PNG file, I estimate the ST-8 at 5.0", and the ST-13 at 10.0". HOWEVER, I need somebody to confirm/deny my suspicions.

Thanks in advance!
Attached Thumbnails
Click image for larger version

Name:  Centuri Argus ST-7 and PSR-78.jpg
Views: 36
Size:  170.2 KB  Click image for larger version

Name:  Argus_cen5309a.png
Views: 31
Size:  66.1 KB  
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
Semroc SAM #0029
NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
Reply With Quote
  #20  
Old 01-26-2019, 12:32 AM
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Tau Zero Tau Zero is offline
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Exclamation Rough draft released - 25 Jan 2019

Quote:
Originally Posted by Tau Zero
I'm starting with the Centuri information from the "Classic Kit" listing on the old Semroc page.

I'll need to cross-reference it with JimZ and Ye Olde Rocket Plans, as well.
Here's my first rough draft, which I hope will be helpful until I can make more progress on this project.

67 Centuri rockets so far, if I counted correctly.


Any feedback or pertinent comments are welcome.

Thanks!
Attached Files
File Type: pdf Centuri Body Tube and Nose Cone List - 25 Jan 2019.pdf (30.2 KB, 53 views)
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
Semroc SAM #0029
NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
Reply With Quote
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