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" Old Shatterhand" 5 shot mag now cycling on vid.

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: daniel323 » Wed May 20, 2009 10:43 am

good work BtB glad to see it firing
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Unread postAuthor: LeMaudit » Wed May 20, 2009 11:46 am

Coming late on the comments... but that's a beautiful gun!
:D
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Unread postAuthor: Brian the brain » Wed May 20, 2009 3:05 pm

now I need to get it to diesel... :D
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Brian the brain » Thu May 21, 2009 4:14 pm

Woops..I was only kidding before.
I think I've just done it.

I used another leadslu with foam tail, so it would be nice and snug.Pushed it in with the bolt.
Opened up the bolt again and sprayed in axe.Didn't expect anything really.

The bang was so loud my ears rang and the recoil was noticable..
Now I never saw a flash, so I'm not 100% sure.

Went back into the house and my wife asked me if I was okay.
She heard a much louder than usual BOOM coming from the shed and wondered if anything had gone wrong.

The slug was pretty much flattened, it hit sideways...wich normally doesn;t happen..

I'll have to test it again, but if this was really autoignition at work, I'm worried about the noise.....
( Pressure used was around 30 bar)
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Mr.Sandman » Thu May 21, 2009 5:53 pm

wow dit is een mooie afsluiter ontwerp je hebt er Ik miste je creatieve werken. ook, hoe is mijn Nederlands?
:D
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Yeah, it's that important.
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Unread postAuthor: POLAND_SPUD » Thu May 21, 2009 8:28 pm

hmmm... so did it diesel?
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Unread postAuthor: Brian the brain » Thu May 21, 2009 11:48 pm

Your Dutch is typically " online translator" ...
It's so far off, if I didn't understand English grammar I couldn't understand it.

I think it dieseled..I'm not sure.When I get a chance I'll try it with starterfluid, in a dark room...

The only way to be sure is to see a muzzleflash..
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Thu May 21, 2009 11:55 pm

I had missed the video, good stuff :) and now you've turned it into the antique hybrid from hell? Where does it stop? Where?

:D :D :D
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Unread postAuthor: CpTn_lAw » Fri May 22, 2009 6:48 am

Loool , good job making it diesel ! i'm gonna try that on the piston rifle...


Edit : louder boom than usual with same pressure means diesel effet?
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Unread postAuthor: Brian the brain » Fri May 22, 2009 8:13 am

Well...as I said, I'm not sure untill I see a muzzleflash.

But...it all points to dieseling:

I've searched for it online and the increased recoil and loud bang ( duh) and even the tumbling of the ammo are all mentioned when it comes to dieseling.the latter caused by supersonic shockwave...

Also, Pyramid-air warns not to use certain lubes in PCP airguns because they can cause dieseling...so not only springers do it, appearently.
This counters the belief the expanding air will prevent it.
Remember, the dead space gets compressed really fast, so a heat effect might also occur there.

I bought some very volatile ether based spray..so I guess I'll find out soon..If it didn't diesel my gun has suddenly gained a lot of power in another way...wich is fine by me also.... :D
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: CpTn_lAw » Fri May 22, 2009 8:25 am

Yeah well, concerning PCP rifles, they also tend to say that when pressurizing the rifle, the heat could set flammable oil in the reservoir on fire.
I tried to put zippo fuel (2 drops) in the dead space before shooting, the noise is stronger than without, recoil is roughly the same, maybe a little more noticeable, and the projectile is light enough not to be accurate even without diesel effet. dead space has to be small for the diesel effect to occur, the bigger it is, the bigger the decompression, the colder the gas comes.
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Unread postAuthor: Ragnarok » Fri May 22, 2009 8:31 am

Brian the brain wrote:Well...as I said, I'm not sure until I see a muzzleflash.

Don't count on seeing one. It's rare to see them on thorough-bred combustions (except in darkness), and in spite of my air rifle having dieseled a few times, I haven't seen any there either.

Lots of smoke though. :roll:
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: Brian the brain » Fri May 22, 2009 8:42 am

I'll have to compare shots at the same pressure and see....
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: CpTn_lAw » Fri May 22, 2009 10:09 am

Oh yeah; well, i've run up the PV = nRT formula, (which is not my expertise domain) and i found nothing...Temperature is almost constant at 275 K give or take; I must be wrong somewhere.
Still, i've done some more shots, with zippo fuel there's a burnt fume smell after the shots. There is still some liquid fuel on the threadings of the barrel, but on the piston and along the barrel, nothing.
Weapons oil doesn't diesel in my pneumatic, but i'm using lower pressures than you.
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Unread postAuthor: Brian the brain » Fri May 22, 2009 10:15 am

Well...Zippo fuel is out, since it would probably eat my piston.
I've with and without the multispray, with seemed to give a louder report.
But since both shots went straight through a fridgedoor, I don;t have any proof...as in penetration-wise..

A fridgedoor in my opinion is a worthy substitute for a cardoor btw.. :D
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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