Centuri body tube list
Is there a kit by kit list of the body tubes used, and lengths, in a similar way to the published pdf for estes kits?
I have had need lately to look up 3 different centuri kits body tube info with very difficult to zero success . Currently I am trying to ascertain which tubes were used in the ss america 5310 |
There is this:
http://www.ninfinger.org/rockets/body_tubes.html Scroll down to the Centuri information. To get tube names for the lengths, go to the Semroc page: http://www.semroc.com/Store/scripts...s.asp?SKU=KV-77 and click on the PDF instruction manual. Scroll down to the parts view. If Body Tube "C" is designated as ST-16120, it is a 16 series tube, 12" long. If the tube were designated as ST-1675, it's another ST-16 series tube, 7.5" long. That should get you started - The older Semroc website is a great source for builds. |
thank you very much
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The classic SEMROC site, Ninfinger, JimZ, and YORF/YORS are the holy grail for classic model rocketry. :cool:
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+1 to what tbzep said above.
Holy Grail. |
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The Semroc USS America is a retro repro, a close reproduction of the original Centuri kit. The Semroc kit uses 24mm motors as opposed to the originals' 18mm motor tube. Unfortunately the links to the Centuri plans for that kit on the JimZ website are not working, but I was able to get the Centuri parts list from an archived page on the JimZ plans site from a few years ago: https://web.archive.org/web/2010071...ica/cen5310.txt Love the Wayback Machine! Here's a tip (you might already know, if so, ignore): At the bottom of the JimZ plans if there is a picture of a compass, caliper, and ruler, that is the link to the parts list. If you are looking for the retro repro, erockets still sells the Semroc kit. If you are looking to CLONE the original Centuri kit, then you can get all the parts from erockets as well. They sell the Centuri ST tubes and even the ramjet cones and nozzles: http://www.erockets.biz/semroc-plas...ets-sem-pc-5rj/ Sirius also sells the ramjet cones/nozzles, but they are currently out of stock.Would be nice if someone like Mr Brohm could compile a list for Centuri kits similar to the one he compiled for the Estes kits, but that would be another monumental undertaking. As a cloner I'm just thankful for the Estes compilation. Cheers. |
Centuri Body Tube List: A Modest Proposal
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What do"all y'all" think of something like the attached .PDF file? Please respond. Thanks! |
Excellent start! Maybe we can do this as a joint effort, with everybody chipping in a little.
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Yes, that is an excellent start for a comprehensive Centuri parts list.
Allen |
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. :D I'll no doubt need help to fill in any knowledge gaps I run into. ;) :D :cool: |
Centuri ST-8 tubes galore
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Okay, here's my first call for help. ;) :D 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. :D . |
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. |
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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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! :D :cool: Cheers, |
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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! :D . |
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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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Okay, thanks! I'll add that to this body tube list. :D Cheers, . |
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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! :D |
Rough draft released - 25 Jan 2019
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67 Centuri rockets so far, if I counted correctly. Any feedback or pertinent comments are welcome. Thanks! |
Great work Jay! Your work will help us all.
I always like the Centuri body tube sizing by diameter and length, Not just random letters like with the Estes parts. |
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Jay, When you have a "final" version or are close to it make a new post in the Plans forum and post it there. I'll then make it a sticky. |
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Jay, Sandman has an Argus kit for sale. Maybe he could measure the tubes, provided they can be easily measured in the bag? Unless you are wanting the kit, in which case for $80 you get the kit, and the measurements! ;) |
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Thanks for the heads up. Unfortunately, I'm short on cash due to looming hospital bills (wife had her gall bladder removed). :eek: ;) :) Also, this message below is all I get. (There is no joy in Mudville...) |
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Will do! :D :cool: . |
Jay,
Sandman's site is only up for ordering during the day when he can "manage" the inventory manually. Also...you can add the Viking, catalog #5440 (one kit) or #5441 (box of 12 kits) with the same parts as the Akela-1 to the body tube list. ....and, best of luck to you and your wife with respect to the gall bladder surgery. My wife went through the same thing a couple of years ago. It was "interesting" for a few days. Don't be afraid to stay ahead of the pain. |
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Sorry Jay! Hope your wife is doing well. I find it’s best for me to only try to visit Gord’s site at night. I’ve saved a lot lately ... ;) |
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I sent Gord a PM, and he was kind enough to take measurements for me. ;) :D :cool: |
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Back in the day, I remember discussing body tube "names" with an Estes fan. The best they could come up with was, "You can put three BT-20s in a BT-60, and have a three-motor cluster. See? It *does* make sense!" --I *still* wasn't convinced. However, it depends on how you were conditioned. ;) :D |
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Yep, it's been a couple of months, so she's doing *much* better. Quote:
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Bill Simon has said he wished that he'd done that tube size naming some other way (he claims responsibility). And yes, that's exactly how BT-60 got to be BT-60. If you look at the oldest Estes catalogs you'll see the first place it was used is the Ranger and Cobra - both three motor cluster models. |
It seemed like a good idea at the time...
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After wrestling with the (very rough) attached section, I wish Bill had done it some other way, too. "If the tube ends in '-J,' that means it's 2.75" long? Say WHAT?" :eek: "And why do the big letters have little (i.e., shorter) tubes?" :rolleyes: . |
I'm not sure but I think that some of the Estes tube length length codes just sort of "happened". If you think that the J designation for a 2.75" tube was interesting. What about the BT-5T and BT-20AE? Both tubes are 1.5" long. There were some tubes that had some pattern to their length code (i.e. BT-5BJ (2.0"), BT-20DJ (4.0"), BT-63CJ (3.0"), BT-50EE (5.5")), and then there were some that had codes specific to a particular kit (i.e. 1298 X-Wing Fighter used an XW length code, but the LL-1, BT-3, BT-5, and BT-20 tubes were all different lengths).
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Centuri Thunderroc 5340
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Centuri Thunderroc 5340 / ST-16180 (3) / 1.640” O.D. / 1.600” I.D. (1980 - 1983) Thanks yet again! |
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I don’t think Bill will take the blame for the letter suffixes. I always just assumed that this happened the same way the nose cone letters seem to have happened....pretty much when a new size (or shape) was needed they just incremented the letter by one. Although if that were strictly true I’d expect the body of the K-1 Scout to be BT-30A and the nose cone to be BNC-30A. For the body tube that turns out to be right, but the nose cone is BNC-30D. Oh well.... :rolleyes: |
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Per the Centuri plans at JimZ's, it is catalog #71043. Searching the Semroc "Classic Cross Reference" pages, that catalog # is a PNC-60AH. Interestingly, catalog #s 71013 and 71014 also show as PNC-60AH. So I would take it with a grain of salt. http://www.semroc.com/Store/scripts/xref.asp |
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It also seems like it could be one of those things that get set up initially, and then whoever picks up the process has to muddle through it. Whether the muddling is successful, though... :rolleyes: It's additional proof that "your mileage may vary." . |
Back in the 50's and 60's money was pretty tight, especially for hobbies. The Estes/Centuri folks probably never had a clue how big the company would grow, much less realize how many dozens of nose cones and tubes they would eventually carry. I imagine when they came up with designations, they figured they wouldn't need something extremely organized for just a few variations.
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UPDATE: 26 Feb 2019
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Here's what I've got for now. It's not entirely complete, but it's been languishing on my hard drive for a month now without any updates. (I was laid off [again] recently, so the whole job search scenario has been occupying my time.) Please note the few "red letter" entries, for which I still need solid information. Submit any questions/corrections/etc. on this thread. Thanks! :D Cheers, |
Awesome work, everyone.
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