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 40 users online :: 6 registered, 0 hidden and 34 guests


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

Registered users: Bing [Bot], D_Hall, Google [Bot], mark.f, MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

How far in can your barrel go into your chamber ?

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

How far in can your barrel go into your chamber ?

Unread postAuthor: tatfree » Tue Mar 23, 2010 1:10 pm

My barrel will be .75" ID by 1" OD and 36" long. My chamber is going to be 2.75" ID. I will probably make the chamber between 3" to 4" long depending on if I can bring that barrel through it by more than an inch or two.( going for 1.5-1 ration Chamber to barrel).
I know that I must deduct the displacment of the barrel that protrudes into the chamber when designing te volume of the chamber.
Seems to be it would hurt performance the more that barrel comes into the chamber, but that's just me. Can anyone clear this up for me.
How much can the barrel come inside your chamber before it sacrafices perfomance ?
I have the Cam and groove couplers by the way.


Thanks
  • 0

User avatar
tatfree
Corporal
Corporal
 
Posts: 63
Joined: Mon Mar 01, 2010 7:43 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Mar 23, 2010 2:28 pm

edit: my bad, didn't realise this was the combustion section :oops:
  • 0

Last edited by jackssmirkingrevenge on Tue Mar 23, 2010 3:05 pm, edited 1 time in total.
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: tatfree » Tue Mar 23, 2010 2:41 pm

Spray and pray (What you all call it )style .

The barrel goes into the combustion chamber, not just butts up against it .

I'll try and find some pics others have posted.
  • 0

User avatar
tatfree
Corporal
Corporal
 
Posts: 63
Joined: Mon Mar 01, 2010 7:43 pm
Reputation: 0

Unread postAuthor: psycix » Wed Mar 24, 2010 6:46 am

If the chamber diameter is large enough: all the way to the back. (Keep a bit of space from the back wall of course. I'd go for the barrel ID.)
Its called coaxial.

In combustions, coaxial setups will have a negative effect on the burn rate, as the flame front has to move around the barrel.
It doesn't matter much though, the effects are minimal.
And if the chamber is large enough, the extra barrel length will just add a lot of power.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: Brian the brain » Wed Mar 24, 2010 5:28 pm

And if you have a cleanout cap at the back, this means you can breechload it.

Slap a tater on the barrel from the back, without pushing it all the way in gives you a -sort-off- burstdisc effect..

just leave a tiny bit of the spud " uncut"
It will allow for some extra pressure build-up before it gets launched.

:D
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Return to Combustion Cannon Discussion

Who is online

Registered users: Bing [Bot], D_Hall, Google [Bot], mark.f, MSNbot Media, Yahoo [Bot]

Reputation System ©'