Ye Olde Rocket Forum - BARCLONE Designer's Studio 2008

#51

03-31-2008, 01:11 AM

A Fish Named Wallyum A Fish Named Wallyum is offline

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Join Date: Mar 2005

Location: Ft. Thomas, KY

Posts: 8,612

Quote:

Originally Posted by CenturiGuy

In the "Scrounged-Up Designs 2006" thread, James Pierson wrote at 07:56 PM on 08-02-2006:

"I personally think that Jay is holding out on us and keeping his best designs for himself. (Feel the love, Jay.)"

I hate to admit this, but Jim was right.

However, I recently noticed that EMRR had a "Box O' Parts" contest (which I was too busy to participate in, due to the recurring intrusions of real life), and I threw together a list of parts that *I* would have included. Then I took it one step further, and tried to figure out how *I'd* put them together.

To that end, I present the "Zeta" (pronounced "ZAY-tuh").

Parts list (all components by Semroc):

BC-760 Nose cone
SE-14 Screw eye
ST-7120 Body tube
ST-530 Body tube (2)
ST-1040 Body tube
CR-710 Centering rings (2)
EH-28 Engine hook
TR-7 Thrust ring
LL-117 Launch lug
EC-130 Elastic cord
SCK-24 Kevlar shock cord
CP-12 Parachute (Use a streamer for B and C-powered flights.)
3/32" balsa

(This may take a few consecutive posts, so I apologize in advance.)

As always, pertinent comments or questions are welcome. Impertinent ones will be dealt with accordingly.

Thanks, and cheers,

That cone is becoming quite the workhorse out west.

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

#52

03-31-2008, 08:58 AM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by A Fish Named Wallyum

That cone is becoming quite the workhorse out west.

I'd be interested in seeing some production numbers from Carl as to how many of these cones he's pulled from the Krellvenator since Jay got him started. The "Tau" series really needed them, and I think there's a few more possibilities with it in the future...

__________________
Craig McGraw

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AMA 352635

#53

03-31-2008, 10:21 PM

James Pierson James Pierson is offline

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Join Date: Dec 2005

Location: Washington State

Posts: 654

Great Design Jay!

Quote:

CenturiGuy Quote:
In the "Scrounged-Up Designs 2006" thread, James Pierson wrote at 07:56 PM on 08-02-2006:

"I personally think that Jay is holding out on us and keeping his best designs for himself. (Feel the love, Jay.)"

I hate to admit this, but Jim was right.

Yes! We have managed, once again, to squeeze another great design from Jay. Its good to hear from you Buddy and hope all is going well in your neck of the woods

Quote:

CPMcGraw Quote:

I'd be interested in seeing some production numbers from Carl as to how many of these cones he's pulled from the Krellvenator since Jay got him started. The "Tau" series really needed them, and I think there's a few more possibilities with it in the future...

I agree Craig. I would really like to see an ST-10 based Tau Cone someday soon. Hint Hint Jay

.

As for me here in WA the weather really sucks! Still below 50 degrees, snowed again Friday & Saturday so I cannot primer the prototypes yet. I am waiting to post pre-testflight photo's after at least one coat of primer is on. Pre-testflight photo's just in case some don't come back in one piece

. Still consumed with starting the build of the Tranquility 9 but still have not started it yet

.

James Pierson
NAR# 77907

#54

04-01-2008, 10:51 PM

Tau Zero

Incurable SEMROC Fan

Join Date: Mar 2005

Location: Twin Falls, Idaho, USA

Posts: 2,318

A Modest Proposal -- BC-1082

Quote:

Originally Posted by James Pierson

I would really like to see an ST-10 based Tau Cone someday soon. Hint Hint Jay

That would be up to Carl, should he reconsider releasing more than just *one* nose cone.

(That April Fools' joke pretty much rivaled Nick's at EMRR several years back.

)

Dredging up the original file posted on Ye Olde Rocket Forum (YORF) back on 06-08-2006:

http://forums.rocketshoppe.com/show...83&postcount=81

...I have updated it per young Mr. JP's request.

The cone section is 7.2" long, while the transition is 1.0" long. The widest point is 1.43", while I'm suggesting a shoulder of 0.75" long.

I humbly submit that its designation should be BC-1082. [EDIT] Instead of 10820... I got carried away and added that extra zero, which is used in *body tube lengths.*

Please notify Mr. McLawhorn if you feel his most excellent company should make this nose cone available. (Oh, and have him bring the dowels back. Gordon "Sandman" Agnello would probably like that.

)

Cheers,

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	TauZero_NoseCone_137X_01.tif (132.9 KB, 83 views)
	TauZero_NoseCone_137X_02.tif (135.5 KB, 73 views)

__________________
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 : 04-02-2008 at 09:53 AM.

#55

04-02-2008, 12:13 AM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

In for a penny, in for a pound...

Jay,

An upscale Andromeda SLS was proposed HERE, so I think another variant would be appropriate. Probably could work it into a 24mm power package (the SLS was 29mm)...

If Carl says yes, I'll get one or two and try building this upscale.

Of course, this also means I need to upscale the Andromeda fin patterns, which Carl would need to feed into the Krellvenator to produce laser-cut frames; and some new bulkheads, too, for those shrouds...

#56

04-05-2008, 10:41 PM

James Pierson James Pierson is offline

Master Modeler

Join Date: Dec 2005

Location: Washington State

Posts: 654

New Design: Galactic Goblin

I don't know if I have posted this design of not?

Cannot find it posted anywhere so here it is. I call it the Galactic Goblin and am posting version 3 of 5 with this design. It looks OK, but is not as stable as I would like it to be. This design really needs an ejection charge of 3 seconds on B motors according to Rocksim for better DV's.

Enjoy and Thanks Again, JP

Galactic Goblin (18mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
A8-3..................125.45308 Ft.............21.9994 ft/s
B4-4..................314.03970 Ft.............18.4159 ft/s
B6-4..................320.77789 Ft.............13.9452 ft/s
C6-5..................713.53347 Ft.............18.4870 ft/s

James Pierson
NAR#77907

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#57

04-05-2008, 11:25 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

...Galactic Goblin...not as stable as I would like it to be...needs an ejection charge of 3 seconds on B motors...

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
A8-3..................125.45308 Ft.............21.9994 ft/s
B4-4..................314.03970 Ft.............18.4159 ft/s
B6-4..................320.77789 Ft.............13.9452 ft/s
C6-5..................713.53347 Ft.............18.4870 ft/s

Interesting images, James. 19 and 14 FPS are not horrible DVs, but if they could be brought down a bit it would make for a not-quite-such-a-nail-biter at chute time...

Could the altitude performance be sacrificed for a softer DV? Larger diameter shroud, or larger fins (greater margin)?

#58

04-06-2008, 11:34 PM

James Pierson James Pierson is offline

Master Modeler

Join Date: Dec 2005

Location: Washington State

Posts: 654

Input Appreciated.

Quote:

CPMcGraw Quote:

Interesting images, James. 19 and 14 FPS are not horrible DVs, but if they could be brought down a bit it would make for a not-quite-such-a-nail-biter at chute time...

Could the altitude performance be sacrificed for a softer DV? Larger diameter shroud, or larger fins (greater margin)?

I tried both and they did raise the margin only slightly. Maybe what this design needs is more length and some nose wieght, but it just don't look right any longer. Besides after it's built it will most likely be heavier than RocKsim says, as usual, and be better off with some nose wieght and a 2 second delay just like the Sabre Tooth on a C motor

.

Thanks for your input Craig, JP.

James Pierson
NAR# 77907

#59

04-08-2008, 10:21 PM

James Pierson James Pierson is offline

Master Modeler

Join Date: Dec 2005

Location: Washington State

Posts: 654

New Design: Sky Champ

Here is another variation of a Lander I came up with called the Sky Champ. It uses an
BnC-55BE as a nose cone and the main body is shaped by using an BTC-70HZ hollow balsa
transition. I cheated the Static Margin reference for this file as I felt the Maximum Frontal
Diameter is too much for this short wide design.
I also added for extra drag at the bottom of the landing legs some CR-7 kockouts of
Carl's .05 cardstock to look like landing pads. I always save these and know I finally ahve a
purpose fro them. I don't know how to sim the drag for the landing pads so I will leave it up
to Jay to fiqure that out. These pads may just be the thing needed to fix the Neptune Lander

CG-CP as well.

Enjoy and Thanks Again, JP

Sky Champ (18mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
1/2A3T-2..............70.68996 Ft..............4.7838 ft/s.
A10T-3................204.79724 Ft.............7.3262 ft/s

James Pierson
NAR# 77907

.

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#60

04-08-2008, 10:54 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

Here is another variation of a Lander I came up with called the Sky Champ. It uses an BnC-55BE as a nose cone and the main body is shaped by using an BTC-70HZ hollow balsa transition...

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
1/2A3T-2..............70.68996 Ft..............4.7838 ft/s.
A10T-3................204.79724 Ft.............7.3262 ft/s...

I've GOT to build this one!

Great looking design, James! Let me guess (without looking at the RS file), the A3-4T has too high a Dv, or it deploys during the down-swing...

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