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"valveless" cartridge concept

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 07, 2010 11:13 pm

Ragnarok wrote:Well, if you're only looking for a few holes in a fairly modest target and some brass flying off, then what you've got will suffice


Realistically, even with a locked breech, given the calibre and size it's not going to be more than that, but it's enough for my purposes :)

For better power I'm best off developing the hybrid cartridges further, which would also remove the need for an on-board air supply.

edit: a-a-a-a-almost there :) but the flimsy magazine broke, moar Araldite!

[youtube]http://www.youtube.com/watch?v=GZ6tuswt2zQ[/youtube]

edit 2: here's the shot that wrecked the magazine, fail but I love the spent cartridge flying out dangerously close towards the camera (and actually hitting the tripod...) :D

[youtube]http://www.youtube.com/watch?v=rmbcywD0Jlo[/youtube]

I encased the base of the magazine in epoxy in the meantime, more testing tomorrow :)
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 09, 2010 11:55 am

WIN!!!!!

[youtube]http://www.youtube.com/watch?v=6RU4fWYFZMs[/youtube]

Now to modify another cartridge to see if it will go full auto :D
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Unread postAuthor: Gun Freak » Tue Nov 09, 2010 12:15 pm

YESS!!! :D
Did you fire the second one? Was it even loaded?
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 09, 2010 2:06 pm

HAHAHAHAHA!!!!

WIN!!!!!!

[youtube]http://www.youtube.com/watch?v=ov7z-mMTJPY[/youtube]

With constant airflow, it not only rechambers a new round but fires it too :D

Very reliable too, works every time! Here it is from various other angles at 420 frames per second :)

[youtube]http://www.youtube.com/watch?v=CpQEDsw-HZE[/youtube]

The plan now is to modify a couple more carts for some longer bursts, then make a "proper" launcher without the ghetto breech and mag substituting rubber bands for springs etc.

Ah, the clatter of spent brass, you should see the grin on my face :D
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Unread postAuthor: Gippeto » Tue Nov 09, 2010 2:21 pm

jackssmirkingrevenge wrote:Ah, the clatter of spent brass, you should see the grin on my face :D


We could if you weren't so camera shy... :wink:

Congrats Jack! :D
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Unread postAuthor: Gun Freak » Tue Nov 09, 2010 2:33 pm

Ahhh SUCCESS. Great job!!! How about a real time video? How fast is the ROF? How loud is each shot? How's the power? :lol: hehe this is sick, hopefully it will work again when you make the proper model. :)
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Unread postAuthor: JDP12 » Tue Nov 09, 2010 3:02 pm

awesome!! congrats JSR!
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Unread postAuthor: POLAND_SPUD » Tue Nov 09, 2010 3:07 pm

you has ejecting cartridges!! :wink:
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Unread postAuthor: maverik94 » Tue Nov 09, 2010 4:31 pm

The failparade is over!! :D Congrats Jack!
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Unread postAuthor: Gun Freak » Tue Nov 09, 2010 4:32 pm

Hey Jack the second video still isn't working, there was probably an issue during uploading.
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Unread postAuthor: jrrdw » Tue Nov 09, 2010 5:04 pm

Gun Freak wrote:Hey Jack the second video still isn't working, there was probably an issue during uploading.


You Tube wrote:This video is not yet processed.


Is there music in the second video? They cross check them if so...

Nice win Jack.
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Unread postAuthor: Gun Freak » Tue Nov 09, 2010 5:08 pm

jrrdw wrote:
You Tube wrote:This video is not yet processed.


It doesn't take 3 hours to process normally.
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Unread postAuthor: Zeus » Tue Nov 09, 2010 6:41 pm

Well done, good to see some dakka dakka with brass.

I even stopped being a tight ars3 and watched the video.

Could you adapt a FN FAL mag or any other 7.62 X 54 mag and use that to feed it?

You'll have to choose a more difficult project next, perhaps a minigun version?
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 10, 2010 2:42 am

Cheers guys :) still grinning! I re-uploaded the second video:

[youtube]http://www.youtube.com/watch?v=2wtPZF_skMU[/youtube]

Gippeto wrote:We could if you weren't so camera shy... :wink:


It's for my own good ;)

How about a real time video? How fast is the ROF? How loud is each shot? How's the power?


This is to answer your first 3 questions ;)

[youtube]http://www.youtube.com/watch?v=zIcB1S1-YhU[/youtube]

Power isn't spectacular, it will go through the bottom of a soup tin quite happily but not much else. To be honest though the flying brass means I'm not too bothered :D

Could you adapt a FN FAL mag or any other 7.62 X 54 mag and use that to feed it?


Not unless I change the way the bolt strips a new cartridge from the magazine, I fear it doesn't have enough power to do so.

You'll have to choose a more difficult project next, perhaps a minigun version?


Let's not get ahead of ourselves ;) putting this together neatly is more of a challenge for me than a minigun version!
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Unread postAuthor: Labtecpower » Wed Nov 10, 2010 11:43 am

Works great!!
looks like crap


Maybe you could remake it with some durable materials?
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