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  #1  
Old 04-17-2007, 11:10 PM
Tau Zero's Avatar
Tau Zero Tau Zero is offline
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Thumbs up Centuri Fireflash

Okay, we all know I can't leave well enough alone. (That's a given.)
So anyway, my latest obsession seems to be recreating the Centuri Fireflash:

http://www.spacemodeling.org/JimZ/km-5.htm

As I'm trying to replicate this, I figured out that the "duct tubes" (see the attached file below) inserted into the ST-5 pod and main tubes are about 1/4" in diameter. Now, on the ~191% ST-10 upscale that I'm planning, I can substitute Semroc BT-3's, but what should I use for the original size? (From what I recall of my original Fireflash "back in the day," the duct tubes were something like fish paper.)

Any suggestions on what to use for 0.25" tubes that wood glue would stick to? (Come to think of it, I could slot some BT-3 and slip it in... )
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
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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

Last edited by CenturiGuy : 12-24-2011 at 02:51 PM.
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  #2  
Old 04-17-2007, 11:21 PM
James Pierson James Pierson is offline
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Wink Just Me?

I too, love this design but unfortunately never had one . If it were me I would forget the original ducted tube method and use the rear ejection design that I used in the Tri-Magnum design. Just a thought , JP

Tri-Magnum Design:
http://forums.rocketshoppe.com/show...ighlight=Magnum

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  #3  
Old 04-17-2007, 11:34 PM
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Tau Zero Tau Zero is offline
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Wink JP's Tri-Magnum Rear Ejection

Quote:
Originally Posted by James Pierson
If it were me I would forget the original ducted tube method and use the rear ejection design that I used in the Tri-Magnum design. Just a thought
JP,

Good thought, but you're not exactly helping with this particular exorcism... If You Know What I Mean (from "What's My Line?")


Cheers, buddy,
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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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  #4  
Old 04-17-2007, 11:37 PM
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Carl@Semroc Carl@Semroc is offline
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Quote:
Originally Posted by CenturiGuy

Any suggestions on what to use for 0.25" tubes that wood glue would stick to? (Come to think of it, I could slot some BT-3 and slip it in... )
The original used Centuri LL-3, our LL-330.
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  #5  
Old 04-17-2007, 11:47 PM
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Tau Zero Tau Zero is offline
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Default Carl to the rescue... AGAIN!

Quote:
Originally Posted by Carl@Semroc
The original used Centuri LL-3, our LL-330.
RockSim quotes your LL-330 as having an Outer Diameter (O.D.) of 0.24".

(cough, cough) Yeah, I already have some of that.


Thanks yet again, Carl!


Cheers,
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
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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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  #6  
Old 04-18-2007, 09:44 AM
Arley Davis Arley Davis is offline
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I pretty sure BMS sale a ¼” body tube, and I know you can get a ¼” plastic tube from Hobby Town and just use CA.
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  #7  
Old 04-18-2007, 02:38 PM
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Default

Quote:
Originally Posted by CenturiGuy
(cough, cough) Yeah, I already have some of that.
No way!!!
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  #8  
Old 12-24-2011, 05:16 PM
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Tau Zero Tau Zero is offline
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Thumbs up Rebooting an old thread

As I mentioned on Bob Thomas' 2X Centuri Fireflash thread, I decided I needed to build a 1.00X version before attempted an upscale to ST-10 tubes.

http://www.spacemodeling.org/JimZ/km-5.htm


Here's the parts list from JimZ updated with Semroc numbers.


Qty. -- Part -- Length

4 BC-510P Nose cone -- 1.0"
1 BC-522P Nose cone -- 2.2"
1 ST-565 main body tube -- 6.5"
2 ST-550 pod body tube -- 5.0"
3 TB-7 (CR-57) centering ring (plus 2 extra)
1 TB-5 Thrust block
2 LL-103 Launch lug -- 0.375"
2 LL-303 Launch lug (ejection port) -- 0.375"
1 1/12" dia. Dowel -- 12.0"
1 1/16" T balsa fins

1 CP-12 Parachute
1 1/8" Braided elastic -- 18.0"


The 1/12" diameter birch dowel is cut into 8 - 1" long pieces, 6 - 1/2" long pieces, and you should have about 1" left over to cut the remaining 11/16" long piece.

This will probably be a display model. I'm using a single 6.5" long main body tube instead of the original 2.5" and 4.0" long tubes.

I think the reason the directions say to stuff the original plastic nose cones with clay is so that the model would fly stably on Centuri's 1/2A4-3M, A4-4M, and B4-5M motors.

At any rate, there's the first step.


Cheers,
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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

Last edited by CenturiGuy : 12-26-2011 at 11:53 PM.
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  #9  
Old 12-25-2011, 01:51 AM
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blackshire blackshire is offline
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If you'd like to go "all plastic" with a Centuri Fireflash clone (like the originals), Sirius Rocketry sells resin duplicates of the Centuri PNC-51 elliptical plastic nose cones (see: http://www.siriusrocketry.biz/ishop...products_id=172 ) that were used in the Fireflash's fuel tanks, and the Estes Gnome/Quark BT-5 size (4:1 ogive) plastic nose cone is virtually identical to the Centuri PNC-54 that formed the Fireflash's ramjet nose.
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Last edited by blackshire : 12-25-2011 at 02:02 AM. Reason: This ol' hoss done forgot somethin'.
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  #10  
Old 12-25-2011, 09:09 PM
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Tau Zero Tau Zero is offline
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Thumbs up Thanks!

Quote:
Originally Posted by blackshire
If you'd like to go "all plastic" with a Centuri Fireflash clone (like the originals), Sirius Rocketry sells resin duplicates of the Centuri PNC-51 elliptical plastic nose cones (see: http://www.siriusrocketry.biz/ishop...products_id=172 ) that were used in the Fireflash's fuel tanks, and the Estes Gnome/Quark BT-5 size (4:1 ogive) plastic nose cone is virtually identical to the Centuri PNC-54 that formed the Fireflash's ramjet nose.
Black Shire,

Thanks for the heads up! I had already ordered the balsa replacements during Semroc's fabulous Christmas sale.

As I mentioned elsewhere, I'm building the original size model as a reference for a ~2.00X ST-10/13-based upscale, which should have *plenty* of room for the recovery system.

Thanks and cheers,
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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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