Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 74 users online :: 5 registered, 0 hidden and 69 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

butane injection system design, need advice on

Discuss miniature cannons built from things such as pill bottles and pen caps.
Sponsored 
  • Author
    Message

butane injection system design, need advice on

Unread postAuthor: JDP12 » Mon Apr 16, 2007 7:25 pm

Okay hello all, I have designed a butane injection system for my mini. If you have any questions, feel free to ask, Spudthug, I know you designed a butane injection, tell me what you think of this will you?

Basically how it works is this. A butane canister has a hose attached to nozzle, and that hose is glued not into the needle holder part, but the area around it. A needle or something similar is put into that needle part, and JBWelded into place. I would then JBWeld the needle into the chamber. So to load it you would just press down on the nozzle of the butane can until the syringe fills up to desired amount, then push the plunger down to inject the butane

But my question is this: When I fire it, is there a possibility of somehow, the combustion working its way up the needle (unlikely but possible), then somehow into the hose and into the butane can, possibly blowing that up?? it does not seem very likely at all, but I just want to take all the safety measures that I can. So post your advice and comments, thanks. Here's the diagram, you'll have to expand it to fully see it sorry. <img src="http://i157.photobucket.com/albums/t79/justhavinagoodtime/butaneinjectiondesign.jpg?t=1176769329">
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Hotwired » Mon Apr 16, 2007 7:28 pm

No.

The bore of the needle is way too small for a flame to travel down
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: JDP12 » Mon Apr 16, 2007 7:42 pm

Okay thanks, I'll try and assemble it this weekend and let you guys know, but first I have to get the mini to actually fire :oops:

K UPDATE/EDIT: I don't have a needle that will fit into my syringe. So I now need to know if a flame from the combustion will travel up the hole of the syringe. The hole is 3/32" thick. Would a flame travel up that hole?????????

anyone else have input on the system?????
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: FiveseveN » Tue Apr 17, 2007 8:42 am

if id does, what's the worse that could happen, the syringe's piston popping out?!
Butane is very sensitive to air/fuel ratio; there's no way it could ignite at that concentration anyway.
  • 0

User avatar
FiveseveN
Captain
Captain
 
Posts: 337
Joined: Fri Oct 14, 2005 5:48 am
Location: Nowhere
Reputation: 0

Unread postAuthor: JDP12 » Tue Apr 17, 2007 9:02 am

haha good point, I suppose that would give before the can would :D

I'm stupid

EDIT: But would it though?
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Scotty » Tue May 22, 2007 1:12 am

Nah me thinks the pressure in the can would not let it, also it has never happened before that i know of.
  • 0


Scotty
Staff Sergeant
Staff Sergeant
 
Posts: 114
Joined: Tue Jan 09, 2007 3:00 am
Reputation: 0

Unread postAuthor: jimmy101 » Tue May 22, 2007 12:19 pm

Your systems sounds about the same as <a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=14699">linky #1</a> and <a href="http://home.earthlink.net/~jimsluka/Fuel%20Meter%20From%20A%20Disposable%20Butane%20Lighter.html">linky #2</a>.


<img src="http://home.earthlink.net/~jimsluka/_images/LighterTubeNeedle.jpg"> and <img src="http://home.earthlink.net/~jimsluka/_images/syringe.jpg">

ilovetoblowthingsup: But my question is this: When I fire it, is there a possibility of somehow, the combustion working its way up the needle (unlikely but possible), then somehow into the hose and into the butane can, possibly blowing that up?? it does not seem very likely at all, but I just want to take all the safety measures that I can.

What exactly do you think would happen if the flame did propagate back to the butane can?

What are the two things that are required for combustion?

Are those two things present inside the butane can?

Besides, you still have the butane can's valve between your chamber and the butane don't you? (The link to your diagram doesn't work.)
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Sponsored

Sponsor
 


Return to Miniature Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], Yahoo [Bot]

Reputation System ©'