Search found 258 matches

by kydavies
Tue Jul 31, 2012 1:45 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

My busy got me some 200lbs test Kevlar line off eBay. My chambers should be done by wednesday :D totally going as batman for Halloween...
by kydavies
Sat Jul 28, 2012 2:15 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

"i did it for my ballistix knife at 250 psi near impossible to open." I used a quick connect on the mk II grapple launcher and I could trigger it with one hand. I believe you can legally buy a ballistic "knife" (grapple hook instead of the blade) but their hard to find and their not cheap. Sorry for...
by kydavies
Tue Jul 24, 2012 2:46 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

Sorry, double post...
by kydavies
Tue Jul 24, 2012 2:43 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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.
by kydavies
Tue Jul 24, 2012 1:32 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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.
by kydavies
Tue Jul 24, 2012 2:29 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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 th...
by kydavies
Tue Jul 24, 2012 1:18 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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 bu...
by kydavies
Tue Jul 24, 2012 12:02 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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.
by kydavies
Mon Jul 23, 2012 1:33 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

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)
by kydavies
Mon Jul 23, 2012 2:01 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

Yeah, I fall a little short in te funnel department but I've got a few tricks up my sleeve. In regards to te rpg video I think we're getting a little off topic here. Spring loaded fins are a bit much for this prototype. Il be making another projectile (all alluminium and a hell of a lot lighter) whe...
by kydavies
Mon Jul 23, 2012 1:18 am
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

If I remember from my water rocketieering days the ideal ratio is somewhere around 1:3 (water to air) I did briefly try filling it with water but an annoying air bubble formed and prevented me from filling the chamber with water.
by kydavies
Sun Jul 22, 2012 11:03 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

No Zeus I didn't :( and I'm not as out of shape as I make myself sound (I troll from a row boat). Quite a while ago somebody here did a really nifty "coaxial burst disk" launcher that used a hallow projectile to "extend" their barrel length. Anyways I really liked it so I might borrow from that. Jsr...
by kydavies
Sun Jul 22, 2012 3:34 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

I'm nerdy and white, I don't expect to be able to climb anything XD
by kydavies
Sun Jul 22, 2012 2:39 pm
Forum: Pneumatic Cannons
Topic: Project batman, mini build log
Replies: 37
Views: 2459

I like star wars to but i aint no tony stark, I'm just a nerdy white guy with a touch of redneck and a garage XD
by kydavies
Sun Jul 22, 2012 2:36 pm
Forum: Hybrid Cannons
Topic: hybrid ballistic knife
Replies: 19
Views: 4893

That makes me so happy. How about shooting a grappling hook over a few buildings? cant picture that ending well :) but I love it