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  #31  
Old 09-01-2005, 11:03 PM
Snakeman Snakeman is offline
Junior Rocketeer
 
Join Date: Sep 2005
Posts: 6
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Hi there!
that's MY Goblin 8" Upscale.


here's a link to my Level 3 website with some pics and a video, etc.

http://home.usamedia.tv/robwegner/images/L3

Enjoy!
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  #32  
Old 09-01-2005, 11:10 PM
WiK WiK is offline
Fire's a beautiful sound...
 
Join Date: Sep 2005
Location: Guildford, UK
Posts: 1
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Hi there,

Its nice to see my project appearing here. Thats my rocksim of a BT80 based Two Stage Goblin. Check out this thread on The Rocketry Forum. It sims out to around 2300ft on 8 D12s. It is almost finished, and should fly at the end of September. Check the thread for more information and pictures.

Just saying, you might want to include credit with pictures from other websites in the future. I look foward to seeing how your Goblin turns out!

Phil
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  #33  
Old 09-06-2005, 04:27 PM
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Thor Thor is offline
BAR Crazy about der GOBLIN
 
Join Date: Jun 2005
Location: Rio Rancho, NM
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Well, I decided rather than stage my heavy 2X Goblin, I now have my first two F motors to try it out. Now to figure out how to use these copperhead ignitors. The motors are Aerotech Econojet F21-4W. I put one motor in the mount and weighed it at 16 ounces. Any idea if it will make 800' on one of these? Thanks Craig for all the help you have given me.
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  #34  
Old 09-06-2005, 05:22 PM
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CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
Default Motors for 2X Goblin

Quote:
Originally Posted by Thor
...The motors are Aerotech Econojet F21-4W. I put one motor in the mount and weighed it at 16 ounces. Any idea if it will make 800' on one of these?


Go with the F21W-6 instead -- the 4-second delay is an instant shredder with a 77 fps Dv...

Deploys about 12" pre-apogee with a 12.4 fps Dv. Nice and smooth for this model...
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  #35  
Old 09-06-2005, 05:32 PM
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CPMcGraw CPMcGraw is offline
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Join Date: Mar 2005
Location: Mobile, Alabama
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Quote:
Originally Posted by Thor
I put one motor in the mount and weighed it at 16 ounces.


I re-simmed the model with an additional 3 oz of mass, to bring the weight up to ~16 oz. You should still use the 6-second delay instead of the 4. The overall altitude drops to 1200', and the Dv becomes 11.3 fps, with deployment still pre-apogee by about 3".

Enjoy that puppy!
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