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  #1  
Old 12-25-2011, 08:19 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Design -- Dark Star

Here's a design I've been tinkering with since 2008. Going with the open-frame fins seems to work visually.

You will need a 48" x 3/16" launch rod, since all engines take at least 34" to reach safe flight V.

Length: 47.00"
Diameter: 1.34" (ST-13)
Fin Span: 8.43"
Weight: 3.63 oz


C11-5.......434'......Dv 19 FPS
D12-5.......970'......Dv 26 FPS
E9-6.......1565'......Dv 16 FPS


Enjoy!
Attached Thumbnails
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Name:  Dark Star V10 3D.jpg
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Name:  Dark Star Fin Sheet V10.PNG
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Name:  Dark Star V10 2D.jpg
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Size:  66.6 KB  
Attached Files
File Type: zip Dark Star Fin Sheet V10.cdr.zip (30.6 KB, 28 views)
File Type: rkt Dark Star V10.rkt (98.3 KB, 31 views)
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  #2  
Old 12-25-2011, 09:50 PM
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Another nice one, Craig. Excellent work.
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  #3  
Old 12-26-2011, 01:13 AM
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Thanks, John.
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  #4  
Old 12-26-2011, 04:37 PM
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Question File Type

Craig what type of file is the fin sheet saved as? I do not have a program tha will open it. Is there any way you can save it as a pdf. File? Very cool rocket by the way. I may build that one. Thanks for the help.
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Old 12-26-2011, 05:04 PM
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Quote:
Originally Posted by nukemmcssret
Craig what type of file is the fin sheet saved as? I do not have a program tha will open it. Is there any way you can save it as a pdf. File? Very cool rocket by the way. I may build that one. Thanks for the help.



Corel Draw. Why that? That is the format Semroc accepts for laser cutting.


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Old 12-26-2011, 07:15 PM
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Quote:
Originally Posted by nukemmcssret
Craig what type of file is the fin sheet saved as? I do not have a program tha will open it. Is there any way you can save it as a pdf. File? Very cool rocket by the way. I may build that one. Thanks for the help.


The file included in the ZIP is in CDR10 format, which, as Bill said, is the format Carl requires for a cutting pattern that can be fed directly into his machine. The other file in the post is in PNG format, which is generally as readable as JPG and TIF. Download a copy of GIMP to open it and print it out on a sheet of sticky label. You can trim away the text from the image before printing using GIMP.
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  #7  
Old 12-27-2011, 09:22 AM
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Or use RockSim to print out the fin templates
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  #8  
Old 12-27-2011, 12:01 PM
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Quote:
Originally Posted by pantherjon
Or use RockSim to print out the fin templates


True, but I do a bit of editing in Corel Draw to the patterns. The changes are usually subtle, but sometimes they're noticeably visible...
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Old 12-27-2011, 07:26 PM
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Excellent design Craig.

What I didn't notice at first glance is that the parachute is located in the forward section of the design. I had just assumed it was located behind the transition in the main airframe thinking the HTC-13 was a solid bulkhead .....

It was only after I looked over the RockSim file that I noticed the four parts used to couple between the mid section cone and transition were not dowels but were actually T-6 airframes ..... a pass-thru for the ejection charge gas to the forward section.

Very cool indeed.



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  #10  
Old 12-27-2011, 09:11 PM
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Quote:
Originally Posted by snaquin
Excellent design Craig.

What I didn't notice at first glance is that the parachute is located in the forward section of the design. I had just assumed it was located behind the transition in the main airframe thinking the HTC-13 was a solid bulkhead .....

It was only after I looked over the RockSim file that I noticed the four parts used to couple between the mid section cone and transition were not dowels but were actually T-6 airframes ..... a pass-thru for the ejection charge gas to the forward section.

Very cool indeed.



.


Thanks, Steve. Now, getting Carl to explain how to drill those four holes through the NCs without tearing the balsa to shreds is going to be interesting...

Pass-throughs is another design element I've been trying to work out for some time. The Trident has etched that idea into my brain so deeply...
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