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Project batman, mini build log

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: killerbanjo » Mon Jul 23, 2012 10:27 am

kydavies wrote:Quite a while ago somebody here did a really nifty "coaxial burst disk" launcher that used a hallow projectile to "extend" their barrel length.


This ;)
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Unread postAuthor: kydavies » Mon Jul 23, 2012 1:33 pm

Exactly I've always loved that concept :) I think I'm going to use the idea of a hallow projectile and make my own quick connect (similar to jsr's ballistic knife)
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 23, 2012 10:31 pm

Hollowed be thy name :)
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Unread postAuthor: kydavies » Tue Jul 24, 2012 12:02 am

Just started work on the grapple launcher mk III and damn it looks sexy!!!! It's kind of a cross between jsr's ballistic knife and hotwired's copperhead launcher.
As soon as I can figure how to post pictures in a thread.
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 24, 2012 12:44 am

Something likethis?

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Unread postAuthor: kydavies » Tue Jul 24, 2012 1:18 am

first: that video was terrifying....

No Jsr, It is not like the diagram you posted. My design is closer to that of Hotwired's copperhead pocket launcher in the way it operates (with respect to the hollow projectile, not the burst disk)
I'm just going to do a drawing to get us all on the same page but in the mean time, heres a pic of the outside (all Al)

edit: the hook/projectile is just a mock up and the big roundish thing is the trigger guard
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 24, 2012 2:02 am

More like this then ;)

http://www.spudfiles.com/forums/mini-ca ... 20262.html

Image

Looks good, just remember your trigger needs to be very strong - at just 100 psi for a 0.75" dia tube, there's around 45 lbs of force trying to rip it off.
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Unread postAuthor: kydavies » Tue Jul 24, 2012 2:29 am

Im using 1/2 Al for the chamber and The trigger and latch mech are going to be made of mild steel sobi should br alright. Even so im going to beef up the trigger.
On another note, I might change to a captive piston so I can store the line inside the launcher (around the grappling hooks shaft) but the trigger mech will still be the same.
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: pneumaticcannons » Tue Jul 24, 2012 11:55 am

On another note, I might change to a captive piston so I can store the line inside the launcher

Have fun trying to get the string to actually exit the launcher. Just keep it on the outside, multiple red flags poped into my head when you mentioned that idea. Why not use 2 trigger latches in order to spread the force more evenly?
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Unread postAuthor: kydavies » Tue Jul 24, 2012 1:32 pm

I slept on it and figured that the latch is going to be a huge pain in the ass due to the undistributed force. We'll see where I get.
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: Goats spudz » Tue Jul 24, 2012 2:28 pm

kydavies wrote:I slept on it and figured that the latch is going to be a huge pain in the ass due to the undistributed force. We'll see where I get.
Couldn't you use three latches distibuted evenly and a collet system where you twist it to fire.
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 24, 2012 2:42 pm

kydavies wrote:I slept on it and figured that the latch is going to be a huge pain in the ass due to the undistributed force. We'll see where I get.


That's why using a quick connect is such a good idea, it's a ready made latch with evenly distributed force.

Something I had drawn up a while ago:

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Unread postAuthor: kydavies » Tue Jul 24, 2012 2:43 pm

Then I might as well use a quick connect fitting and a captive piston.
Damn it jsr! Beat me by less than a minute :(
It seems like the quick connect and captive piston is the way to go.
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Last edited by kydavies on Tue Jul 24, 2012 3:22 pm, edited 1 time in total.
mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: kydavies » Tue Jul 24, 2012 2:46 pm

Sorry, double post...
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: Crna Legija » Wed Jul 25, 2012 3:31 am

kydavies wrote:Then I might as well use a quick connect fitting and a captive piston.


i did it for my ballistix knife at 250 psi near impossible to open.
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