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MMK-3 French QDV airgun

Built a pneumatic 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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Unread postAuthor: Mimikool » Wed Jun 01, 2011 8:12 am

Hello all, i recome to show ou two videos of my 1" 1/2 qev launcher.
It's only work at 10bar, i've a fridge compressor but i don't know how cabler it. I give it to my electronic teacher, i'llcan receive it next week.

I notice that it didn't do "PAF" but "pwof", so now i use burst disk, and it's better of course :D Best sound !


[youtube]http://www.youtube.com/watch?v=Ue4HlBxiJuc[/youtube]


(You can notice the useness of holes in muzzle, altough they aren't big)
[youtube]http://www.youtube.com/watch?v=pThkiyDSrgk[/youtube]
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Unread postAuthor: Gun Freak » Thu Jun 02, 2011 6:33 pm

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Unread postAuthor: drunpal » Sun Jun 05, 2011 8:12 am

I think that pump is this one, at least it looks the same. http://www.zefal.com/zefal/produit.php?key=092002
And really nice cannon, my QEV will be pretty similar.
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Unread postAuthor: Mimikool » Mon Jun 06, 2011 12:47 pm

Yes, it's the second, the zefal pump.

Thanks :D
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Unread postAuthor: exotechmaster » Mon Jun 06, 2011 5:54 pm

its a nice one...looks clean and easy to make

i like the flash of vapour coming out the muzzle brake (holes at end)
it makes me feel all fuzzy inside :twisted: when i see it


also muzzle brakes reduce recoil and projectile tumble
i spent about 4hrs debating the pro's/con's with a mate
yesterday about them
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Unread postAuthor: Mimikool » Tue Jun 07, 2011 12:33 pm

Muzzle brakes reduce the recoil because gases are redirected back, toward the shooter, and apply force in opposition with recoil.

Here, there are just holes, so the recoil is not reduced, but the projectile tumble yes ;)
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Unread postAuthor: Labtecpower » Tue Jun 07, 2011 12:51 pm

Looks good!

Do you only shoot with potato slugs?
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Unread postAuthor: Mimikool » Tue Jun 07, 2011 1:28 pm

No I think shoot 25mm marbles, i've got three, but i haven't target witch will no break, i want shoot in safety, for myself and others.
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Unread postAuthor: Labtecpower » Tue Jun 07, 2011 2:09 pm

ahh nice :D

I recommend a thick layer of newspapers as a backstop. A thick enough layer will stop everything.
Be sure to pick a nice target! :wink:
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Unread postAuthor: Labtecpower » Fri Jun 17, 2011 11:38 am

Have you shot one of the ballbearings yet? I would like to see some damage pics :D
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Unread postAuthor: Mimikool » Fri Jun 17, 2011 12:02 pm

No, the O-ring of the piston was taken off when i shooted yesterday.

So i will remplace the stainless by a plastic piston, lighter, and i'll put a seal of tap held in place by a screw.

Unfortunatly, it's not for now, ma father can't machine it some time before.

As soon as i have the piston, i make some shoots, some pics, some vidéos to you ;)
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Unread postAuthor: Labtecpower » Fri Jun 17, 2011 1:04 pm

define plastic?

Nylon and HDPE are tough and relatively flexible. PVC is somewhat brittle, but I didn't break it in my QDV.

Also take in account that a plastic piston will have less impact energy, thus less power to damage itself.
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Unread postAuthor: saefroch » Fri Jun 17, 2011 1:15 pm

Labtecpower wrote:Also take in account that a plastic piston will have less impact energy, thus less power to damage itself.
Let's not get into this again...
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Unread postAuthor: Labtecpower » Fri Jun 17, 2011 1:24 pm

I didn't read that, but after reading it I will accept that I was wrong :D

Still, I like plastic pistons more than metal ones, because of the easier machining.
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Unread postAuthor: Mimikool » Fri Jun 17, 2011 1:39 pm

Yes, i imagine what it give for you, i write with the little i learn me my teacher this year... :D
And at school, we learn stupid sentences in a stupid situations that never you will say or live in real life. While we should teach us things that will be useful if you go to States or England.

So... it will certainely be PA66 or PA6 plastic, a full cylinder, diameter 40mm and 60mm long.
I will put a seal at the back to cushion th shock and make sealing to reduce losses.

(I don't understant all about turtes dicussion.. :D )

Machine plastic is easy, yes, but you can't be accurate, you can machine 1 or 2mm in only one time, but to remove 0.2mm it's difficult !
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