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District 9 Gas Projector (video added)

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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District 9 Gas Projector (video added)

Unread postAuthor: marcin411 » Thu Dec 15, 2011 11:30 pm

Latest triumph of PVC and sleepless nights. Somewhat replica of the District 9 gas projector gun.
Basics are:
1" barrel
2" x 9" chamber
tazer ignition
internal vent fan
metered propane
muzzle loader
All custom PVC parts

[http://www.youtube.com/watch?v=LotPxMix9P8]
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Attachments
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Left side view
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rear view
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before the paint
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some guts
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DSCF0018 (700x525).jpg
DSCF0052 (700x525).jpg
Last edited by marcin411 on Tue Jan 10, 2012 9:35 pm, edited 1 time in total.

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Unread postAuthor: mark.f » Thu Dec 15, 2011 11:46 pm

Wow! Where to start?

Amazing job picking a theme and sticking to it, amazing attention to detail, and amazing follow-through.

Didn't really get a chance to comment on your past submissions, so wonderful job overall!
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 16, 2011 12:34 am

Very impressive, kudos!

You've captured the look while integrating a metering system, brilliant. All we need now is to see it in action :D
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Unread postAuthor: JDP12 » Fri Dec 16, 2011 1:30 am

wow!!! I'm a huge fan of the District 9 guns.. and that is an awesome version congrats!
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Unread postAuthor: marcin411 » Fri Dec 16, 2011 9:14 am

Thanks guys, I'll do a little video demo hopefully in the next week or so.
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Unread postAuthor: marcin411 » Tue Jan 10, 2012 9:43 pm

Test fire video added, enjoy.

http://www.youtube.com/watch?v=LotPxMix9P8
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Unread postAuthor: Gun Freak » Tue Jan 10, 2012 10:05 pm

Wow... :shock:

That is unbelievable. You must have spent so much time on the custom PVC. I did the same with my M16 (link in sig) so I know what it's like!

Smooth operation... I'm impressed. Nice work.

Shouldamadeitpneumatic :D
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Unread postAuthor: evanmcorleytv » Tue Jan 10, 2012 10:13 pm

Looks GREAT!! I was a little frightened by the delay in the video though!!
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Unread postAuthor: marcin411 » Tue Jan 10, 2012 11:22 pm

The PVC fabrication took the majority of time. With a few hours of work a week it took about 8 months to finish. Nice work on the airsoft M16.

I'm puzzled by the delay in fire as well, It happens every once in a while. I'm definetly getting spark each time but it took three sparks to ignite in the video. Any ideas?
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Unread postAuthor: Crna Legija » Wed Jan 11, 2012 1:17 am

marcin411 wrote:I'm puzzled by the delay in fire as well, It happens every once in a while. I'm definetly getting spark each time but it took three sparks to ignite in the video. Any ideas?


probably fuel wasn't mixed well or you might have let it sit and the fuel collects at the bottom of the chamber
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 11, 2012 1:25 am

I love the way you patted it lovingly when it actually did fire :D

Could your meter calculations have been off?

Crna Legija wrote:probably fuel wasn't mixed well or you might have let it sit and the fuel collects at the bottom of the chamber


If you let it sit, it's even better ;) the gas diffuses and forms a more homogenous mixture.
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Unread postAuthor: cowscankill » Sun Oct 21, 2012 4:38 pm

I usually see two pressure gauges on metered propane combustion cannons. Not sure where yours is connected exactly. Anyone wanna tell me how I can get by with one so I can save on costs?
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Unread postAuthor: MrCrowley » Sun Oct 21, 2012 4:50 pm

You only need one gauge in the meter and that's it. Don't see the point in having two gauges unless one is on a regulator.
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Unread postAuthor: marcin411 » Mon Oct 22, 2012 4:29 pm

As MrCrawley noted one gauge is enough, I use one on the outlet of the regulator. This gives me a pressure reading and a fixed metered gas volume for setting the proper mix.
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Unread postAuthor: marcin411 » Mon Oct 22, 2012 4:32 pm

As an update I was getting a gas leak with the pvc meter pipe and have since switched to steel pipe and brass valves for the metering pipe. Live and learn.
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