Posted: Mon Jul 23, 2012 10:27 am
Thiskydavies 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.
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Posted: 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)
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)Posted: Mon Jul 23, 2012 10:31 pm
Hollowed be thy name
Posted: 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.
As soon as I can figure how to post pictures in a thread.
Posted: Tue Jul 24, 2012 12:44 am
Posted: 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
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
Posted: Tue Jul 24, 2012 2:02 am
More like this then
http://www.spudfiles.com/forums/mini-ca ... 20262.html
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.
http://www.spudfiles.com/forums/mini-ca ... 20262.html
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.
Posted: 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.
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.
Posted: Tue Jul 24, 2012 11:55 am
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?On another note, I might change to a captive piston so I can store the line inside the launcher
Posted: 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.
Posted: Tue Jul 24, 2012 2:28 pm
Couldn't you use three latches distibuted evenly and a collet system where you twist it to fire.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.
Posted: Tue Jul 24, 2012 2:42 pm
That's why using a quick connect is such a good idea, it's a ready made latch with evenly distributed force.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.
Something I had drawn up a while ago:
Posted: 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.
Damn it jsr! Beat me by less than a minute
It seems like the quick connect and captive piston is the way to go.
Posted: Tue Jul 24, 2012 2:46 pm
Sorry, double post...
Posted: Wed Jul 25, 2012 3:31 am
i did it for my ballistix knife at 250 psi near impossible to open.kydavies wrote:Then I might as well use a quick connect fitting and a captive piston.