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 69 users online :: 5 registered, 0 hidden and 64 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

co axial

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

co axial

Unread postAuthor: Cosmic Muffin » Wed Dec 17, 2008 12:47 am

what do you blokes rekon about having a coaxial combustion cannon ?
just i have never seen one before.
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: jook13 » Wed Dec 17, 2008 1:00 am

I think it could be a good thing if you were really concerned about keeping it compact.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: Gippeto » Wed Dec 17, 2008 1:03 am

Co axial is just the configuration. Around here, it means that the barrel runs well into the chamber.

If I remember correctly, the reason that you don't see many co axial combustion canons is efficiency losses.

The barrel being in the combustion chamber, robs heat from the reaction, lowering the max temp and thus the max pressure achieved.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: Cosmic Muffin » Wed Dec 17, 2008 1:39 am

yer well i spose your guys are right, too many energy exchanges or whatever it is, i might try it one day though. whats the harm in trying these things :wink:
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: Xxplosive42o » Wed Dec 17, 2008 2:13 am

No harm at all Cosmic. Innovation is a great thing because building the same thing can get quite boring. :?

Let us all know if you decide to take the endeavor. :P

Cheers!
  • 0

" Forget about all the reasons why something may not work. You only need to find one good reason why it will. "
User avatar
Xxplosive42o
Donating Member
Donating Member
 
Posts: 134
Joined: Tue Dec 09, 2008 5:57 pm
Location: Los Angeles, Ca.
Reputation: 0

Unread postAuthor: Lentamentalisk » Wed Dec 17, 2008 3:02 am

just make sure to have a lot of spark gaps, all along the length of the chamber, or at least one 1/4 of the way from each end. That will effectively double the flame front area.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: CasinoVanart » Wed Jan 07, 2009 6:09 pm

This idea makes loading easier as you can load through the back of the chamber. I have used the idea successfully on a few of my combustions, go for it!!
  • 0

User avatar
CasinoVanart
1st Lieutenant
1st Lieutenant
 
Posts: 281
Joined: Wed Jul 30, 2008 1:10 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: sputnick » Wed Jan 07, 2009 7:01 pm

I think that there would not be much point, seeing as the point of pneumatic coaxial guns is to allow for a piston, and more airflow. With combustions, however, that is not an issue.
  • 0

Image


Add me on MSN to chat about whatever!
User avatar
sputnick
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Sun Dec 14, 2008 3:53 pm
Location: Ontario Canada
Reputation: 0

Unread postAuthor: CasinoVanart » Wed Jan 07, 2009 7:09 pm

Ya i know but i like doing things different :D Just makes for easier loading. The only thing i don't like is that it robs capacity from the chamber, i just make the chamber a bit bigger to start with.
  • 0

User avatar
CasinoVanart
1st Lieutenant
1st Lieutenant
 
Posts: 281
Joined: Wed Jul 30, 2008 1:10 am
Reputation: 0

Unread postAuthor: Combustion Monkey » Sun Jan 11, 2009 3:49 pm

Hi folks this my first post here. I have built a coax gun with a 346ci chamber, thats counting the space the barrel takes up. The barrel also passes all the way through the chamber for breach loading. It also has a pc fan for venting and mixing. The thing runs great and can handel a 13ft barrel although it usually only runs about 4ft of external barrel, i'll get pics up as soon as i can.
  • 0

User avatar
Combustion Monkey
Master Sergeant
Master Sergeant
 
Posts: 153
Joined: Sun Jan 11, 2009 3:01 pm
Reputation: 0

Unread postAuthor: Combustion Monkey » Sun Jan 11, 2009 4:19 pm

This is the gun, I hope the pic works, not very handy at forum posting yet. The wine bottle is there for scale. [img][img]http://img89.imageshack.us/img89/9646/picture066jl6.th.jpg[/img][/img]
  • 0

User avatar
Combustion Monkey
Master Sergeant
Master Sergeant
 
Posts: 153
Joined: Sun Jan 11, 2009 3:01 pm
Reputation: 0

Unread postAuthor: starman » Sun Jan 11, 2009 4:51 pm

Hey Combustion Monkey, that looks like some nice weaponry you have there. Why don't you post it in the combustion cannon showcase along with more details and somewhat bigger pics.

Welcome to Spudfiles!
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot]

Reputation System ©'