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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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18-stage coilgun

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PYLEMET-mk2
Sat Dec 12 2009, 09:20AM
PYLEMET-mk2 Registered Member #1513 Joined: Sat May 31 2008, 12:08PM
Location: Russia Klin
Posts: 48
total efficiency is around 5%. Extra coils eficiency is bad - about 3-4%. It is because I cannot measure changing in speed with enough accuracy after each coil to suggest - coil is bad or good, and its position on barrel too
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PYLEMET-mk2
Sat Dec 12 2009, 05:46PM
PYLEMET-mk2 Registered Member #1513 Joined: Sat May 31 2008, 12:08PM
Location: Russia Klin
Posts: 48
in case:
920260
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Backyard Skunkworks
Sat Dec 12 2009, 07:58PM
Backyard Skunkworks Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
28J means you have built one of the most powerful coilguns 4HV has seen! Great job!

Whats your charging system?
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Killa-X
Sun Dec 13 2009, 12:33AM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Very nice speed for the joules! Awhile ago I was messing with single coil, 28J, and it did 10ft..but it couldnt even hole a can. Yours by far is stronger than anything i ever made because i never gone through coffee cans :P Great job! What are the capacitor specs?
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PYLEMET-mk2
Sun Dec 13 2009, 08:02AM
PYLEMET-mk2 Registered Member #1513 Joined: Sat May 31 2008, 12:08PM
Location: Russia Klin
Posts: 48
wrote ...
Whats your charging system?
60W homemade flyback converter, you could see how it works here: Link2
wrote ...
What are the capacitor specs?
12x 400v 390mkf, 7x 400v 330mkf from old monitors
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Steve Conner
Sun Dec 13 2009, 12:41PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Llevellyn please resize your pictures, they are far over the 400 pixel limit! frown

The limit applies to all pictures whether uploaded to the forum or externally hosted. It has nothing to do with bandwidth: it's to preserve readability for users with smaller screens.

Nice project, BTW.
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PYLEMET-mk2
Tue Dec 15 2009, 12:41PM
PYLEMET-mk2 Registered Member #1513 Joined: Sat May 31 2008, 12:08PM
Location: Russia Klin
Posts: 48
I have almost ended my construction.
Photos:

947776

Without cover
935488

Video (just 1 shot for that time, but I plan to record more) Link2
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PYLEMET-mk2
Tue Dec 15 2009, 06:24PM
PYLEMET-mk2 Registered Member #1513 Joined: Sat May 31 2008, 12:08PM
Location: Russia Klin
Posts: 48
archive with photos in hi res (12m) Link2
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Bonehead
Tue Dec 15 2009, 10:12PM
Bonehead Registered Member #2046 Joined: Sun Mar 22 2009, 01:12PM
Location: Stockholm, Sweden
Posts: 23
Insane coilgun! I'm very impressed by the charger as well.
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Turkey9
Wed Dec 16 2009, 01:06AM
Turkey9 Registered Member #1451 Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Wow, that's great! Held on the shoulder like a rocket launcher? Can't wait to see some more videos, maybe a long distance shot?
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