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  #21  
Old 05-21-2020, 04:31 PM
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Quote:
Originally Posted by BEC
David - here's a chart that should give you ODs for Centuri tube guides: http://www.ninfinger.org/rockets/body_tubes.html, though I expect you already have the info.

Interestingly, that chart doesn't have ST-9. It has the same ID as BT-50 but .024 walls (per eRockets data), so it's a touch larger OD than what BMS sells as BT-50H.

ST-8 is the odd one that doesn't really have an Estes tube size that is close by. It's a size that I like to use on scratch builds.


Back in the day, I don’t think Centuri ever listed the ST-9 tube in their catalog. Besides their Mini Max and Enerjet line (which is outside what we are talking about here anyway), they did not offer a D engine (and hence motor mounts of that size) until their 1980 catalog, with their ‘Magnum D’ line. And even then, just plain old tube stock of the 24mm size was not in their catalog. So, that size tube, as an “ST-9” never was really in their catalog. They did offer a line of Magnum D motor mounts to fit a 24mm D motor into their ST-13, 16, and 20 size tubes.

However, by their 1982 catalog, they had dropped all their “ST” tubes and parts and had gone all Estes tubes, cones, etc., since they, by that time, were listed as a Penrose post office box and the end was close at hand. In their last catalog, in 1983, they did not even list tubes, cones, reducers, etc. at all, sadly.

I think the first time I ever saw a tube labeled as an “ST-9” was in Semroc’s tubes offerings.

So...that may explain why the list you referenced for David did not show at ST-9.

Earl
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Last edited by Earl : 05-21-2020 at 06:32 PM.
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  #22  
Old 05-21-2020, 05:08 PM
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I thought that might be the case. I was a little surprised at seeing Bill include it in his responses to David.
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  #23  
Old 05-21-2020, 05:44 PM
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Talking Semroc / "Centuri" ST-9

Quote:
Originally Posted by BEC
David - here's a chart that should give you ODs for Centuri tube guides: http://www.ninfinger.org/rockets/body_tubes.html, though I expect you already have the info.

Interestingly, that chart doesn't have ST-9. It has the same ID as BT-50 but .024 walls (per eRockets data), so it's a touch larger OD than what BMS sells as BT-50H.
From http://www.erockets.biz/semroc-body-tube-9-3-0-long/

Semroc Body Tube #9 3.0" Long SEM-ST-930

OD: 0.998

ID: 0.950

Thickness: 0.024


Quote:
ST-8 is the odd one that doesn't really have an Estes tube size that is close by. It's a size that I like to use on scratch builds.
Wasn't ST-8 particularly desireable for scale builders? I seem to recall something to that effect, but memory isn't what it used to be.

Speaking of which, there are two signs of advancing age. One of them is memory loss.

I forget what the other one is.
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"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #24  
Old 05-21-2020, 06:34 PM
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Jay - yeah, eRockets is where I got that "same as BT-50 ID but .024 walls" bit. 0.950 is the same ID as BT-50, but they only have .013 walls....

So....what were those signs again...?
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  #25  
Old 05-21-2020, 06:35 PM
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Quote:
Originally Posted by Tau Zero
From http://www.erockets.biz/semroc-body-tube-9-3-0-long/

Semroc Body Tube #9 3.0" Long SEM-ST-930

OD: 0.998

ID: 0.950

Thickness: 0.024


Wasn't ST-8 particularly desireable for scale builders? I seem to recall something to that effect, but memory isn't what it used to be.

Speaking of which, there are two signs of advancing age. One of them is memory loss.

I forget what the other one is.


You probably don’t WANT to know what the other is!

Earl
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  #26  
Old 05-21-2020, 08:32 PM
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Pic of my DIY fin alignment tool.

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  #27  
Old 05-21-2020, 10:03 PM
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Quote:
Originally Posted by ghrocketman
I use a pair of accurately calibrated eyeballs as my DIY alignment tools.
TLAR, SWAG, and KISS certified.

If you need a definition of those acronyms, I can gladly provide.
Just make sure to avoid SNAFU, FUBAR, and BOHICA.


Don’t forget LSMFT.
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  #28  
Old 05-21-2020, 10:55 PM
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Quote:
Originally Posted by tbzep
Pic of my DIY fin alignment tool.


https://www.youtube.com/watch?v=LsrtCIC4EWM
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NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #29  
Old 05-21-2020, 11:51 PM
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Quote:
Originally Posted by Tau Zero

Almost. Jack Elam.

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  #30  
Old 05-21-2020, 11:54 PM
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Quote:
Originally Posted by tbzep
Almost. Jack Elam.
Like deserves like.
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


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