Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > BARCLONE > Designer's Studio
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Closed Thread
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-01-2007, 08:09 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default Andromeda Update for 1-1-07

I just created a new simulation file of the Andromeda, with the addition of two CR-713 centering rings mounted at the openings of the shrouds. This will block off the flow of air through the shrouds and prevent them from acting as ringfins. The first indication that this may be important is the altitude gained: 910' versus 881' over the non-plugged non-ringfin simulation. The second indication that something changed was the stability margin; when using a C6-5 the margin dropped to 0.74. A ballast weight of 0.10 oz was added to the back of the nose cone, and the margin came back up to 1.13.

The fins were altered to allow the shrouds to fit better, and a slot was drawn in to allow for the two centering rings. A corresponding interlocking slot needs to be cut into both rings.

I'll work up the latest patterns and post them later tonight, or tomorrow.
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
  #2  
Old 01-01-2007, 10:09 PM
James Pierson James Pierson is offline
Master Modeler
 
Join Date: Dec 2005
Location: Washington State
Posts: 654
Question Huh??

Craig said,
Quote:
I just created a new simulation file of the Andromeda, with the addition of two CR-713 centering rings mounted at the openings of the shrouds. This will block off the flow of air through the shrouds and prevent them from acting as ringfins. The first indication that this may be important is the altitude gained: 910' versus 881' over the non-plugged non-ringfin simulation. The second indication that something changed was the stability margin; when using a C6-5 the margin dropped to 0.74. A ballast weight of 0.10 oz was added to the back of the nose cone, and the margin came back up to 1.13.


This leads me to suspect that just maybe Rocksim is not accounting for airflow through both the Ringfins and Tubefins. I wonder?? It may be the extra wieght of the added CR-713 that accounts for the altitude change.

James Pierson
NAR# 77907
Reply With Quote
  #3  
Old 01-02-2007, 12:03 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Exclamation Andromeda Update for 1-1-07, Revised

Here's the latest incarnation of the Andromeda, incorporating the changes I mentioned in the earlier post. I'll try to get the outlines of the modified centering rings posted sometime tomorrow.
Attached Thumbnails
Click image for larger version

Name:  Andromeda Mk IV 2D.jpg
Views: 570
Size:  86.0 KB  
Attached Files
File Type: rkt Andromeda Mk IV.rkt (80.6 KB, 395 views)
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
  #4  
Old 01-02-2007, 12:08 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Exclamation Andromeda Update for 1-1-07, Revised

Here's the latest incarnation of the Andromeda, incorporating the changes I mentioned in the earlier post. I'll try to get the outlines of the modified centering rings posted sometime tomorrow.

Length: 23.95"
Diameter: 1.04" (BC-760) [Shrouds ST-16]
Fin Span: 5.799"
Weight: 1.9112 oz

CP = 14.8467" from nose tip

A8-3......138'......Dv 18 FPS......Requires 40" of guide length
B4-4......374'......Dv 3 FPS.......Requires 36" of guide length
B6-4......384'......Dv 4 FPS.......Requires 36" of guide length
C6-5......908'......Dv 16 FPS......Requires 36" of guide length

Enjoy!
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
  #5  
Old 01-02-2007, 12:10 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default Oops...

Sorry for the almost-duplication. Computer-related glitch...
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
  #6  
Old 01-02-2007, 12:36 AM
A Fish Named Wallyum's Avatar
A Fish Named Wallyum A Fish Named Wallyum is offline
BP Mafia
 
Join Date: Mar 2005
Location: Ft. Thomas, KY
Posts: 6,918
Default

Quote:
Originally Posted by CPMcGraw
Sorry for the almost-duplication. Computer-related glitch...


When I read this, the first thing that popped into my mind was
"There's a town I know where the hipsters go called BEDROCK, glitch, glitch."
Must be the anti-biotics....
__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I was SAM 0058

On the build floor: Centuri Stellar Hercules, Semroc SLS Scorpion, Semroc Squire, RDC V-Max

Ready to fly: Canaroc Green Hornet, Estes Astron Farside X, FSI Eos, FRW Magnum Spartan, Centuri Stellar StarLifter, Estes World Federation Star Probe, Estes Astron Apogee
Reply With Quote
  #7  
Old 01-02-2007, 12:56 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default

Quote:
Originally Posted by A Fish Named Wallyum
When I read this, the first thing that popped into my mind was
"There's a town I know where the hipsters go called BEDROCK, glitch, glitch."
Must be the anti-biotics....


Wowsy, wowsy, woo, woo...

"And I can't get it outta my head..."
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
  #8  
Old 02-18-2007, 04:54 AM
Mark+3 Mark+3 is offline
Intermediate Rocketeer
 
Join Date: Jan 2007
Posts: 45
Default Need RockSim Help

OK folks this one has me stumped. Flight simulation says it won't leave the rod and 2D profile shows it starting parallel to the ground (launch rod @ 0 degrees). Did I miss something? Software problems? Any help would be appreciated.
Attached Files
File Type: rkt nofly2.rkt (29.9 KB, 195 views)
Reply With Quote
  #9  
Old 02-18-2007, 08:11 AM
snaquin's Avatar
snaquin snaquin is offline
The_Ripper
 
Join Date: Jun 2005
Location: Louisiana
Posts: 1,440
Default

Quote:
Originally Posted by Mark+3
OK folks this one has me stumped. Flight simulation says it won't leave the rod and 2D profile shows it starting parallel to the ground (launch rod @ 0 degrees). Did I miss something? Software problems? Any help would be appreciated.


Look at the fin thickness of the rocket image when you prepare for launch to load a motor or view the line diagram in the 2D base view of the design.

It's your fins. I'm assuming that you wanted 0.09380 instead of your 0.9380 for the thickness of the fin material since these fins are almost an inch thick? You also selected "custom" for the fin material and that has a "zero" mass for the fins. Instead choose balsa or one of the other materials.

I changed the design to balsa and 0.09380 for the fin thickness and it flys fine.

The 3D export did look kinda cool .....

.
Attached Thumbnails
Click image for larger version

Name:  _nofly2.jpg
Views: 210
Size:  14.9 KB  
__________________
Steve Naquin
TRA# 677 L2
NAR# 85518 L2
SAM# 0052

Last edited by snaquin : 02-18-2007 at 08:28 AM.
Reply With Quote
  #10  
Old 02-18-2007, 03:13 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default BARCLONE Update Alert

Everyone,

The first of several updates to the BARCLONE website have now been posted and those plans are available for download. It has taken longer to do this than was originally planned, but shortly we hope to have all of the 2006-Series plans up and visible. One of our goals was to reach 300 plans before December, and I think we accomplished that before September. The new goal is to reach 500 plans before the end of 2007; if we have the same degree of contributions that we had in 2006, we should reach this goal just as easily.

Thanks to all who participated!
__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635
Reply With Quote
Closed Thread


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 05:49 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2019