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 68 users online :: 4 registered, 0 hidden and 64 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

My Cannons

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Unread postAuthor: starman » Tue Jun 10, 2008 1:25 am

ammosmoke wrote:I was under the impression that using carb/engine cleaners is a bad practice. I don't think that using such a strong chemical is a good idea.


As long as you don't huff it or take a bath in it and don't do generally stupid things with it, it's not any different that any other flammable fluid we use in our daily lives.

However, using a fuel that's packaged properly and meant to be burned for energy...ie. propane..is really what ought to be encouraged. Spray and prays really shouldn't be much more than a 10 or 20 shot curiousity before moving on...IMO of course.
  • 0

Last edited by starman on Fri Jun 13, 2008 9:50 am, edited 1 time in total.
User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: n-strike » Tue Jun 10, 2008 7:28 pm

So are you saying that it's better to have your chamber smaller than your barrel?
  • 0

User avatar
n-strike
2nd Lieutenant
2nd Lieutenant
 
Posts: 219
Joined: Sat Apr 26, 2008 3:48 pm
Location: Richmond, BC, Canada
Reputation: 0

Unread postAuthor: Canuck » Fri Jun 13, 2008 9:09 am

Its'd better to have your chamber have more volume then your barrel, IMO.
  • 0


Canuck
Private First Class
Private First Class
 
Posts: 30
Joined: Wed May 28, 2008 9:41 pm
Reputation: 0

Unread postAuthor: starman » Fri Jun 13, 2008 9:29 am

n-strike wrote:So are you saying that it's better to have your chamber smaller than your barrel?


Read through the discussion that preceeded this question again. Ideal c:b ratio for a combustion falls into the .5 - 1.5:1 range. This is only an efficiency window and says nothing about absolute performance.

The .5 would mean the chamber is smaller by volume than the barrel...the 1.5 would mean the chamber is larger by volume than the barrel.

Increasing your chamber size, while keeping the same barrel will always improve performance some but your efficiency goes down and much of the extra energy is wasted as heat and sound after the projectile has left the barrel.

The dynamics of this is different with a burst disk.
  • 0

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

Unread postAuthor: Spuddin » Fri Jun 13, 2008 10:23 am

about the only way to find out the best performance is trial and error, use anything that says flammable and see how it goes. i would think rocks would be hard to get a tight fit which is what you want, the tighter the better. i think the barrel length is fine, just whatever you prefer.
good job on the guns u made.
  • 0

User avatar
Spuddin
Donating Member
Donating Member
 
Posts: 262
Joined: Wed May 16, 2007 1:28 pm
Location: Oklahoma
Country: United States (us)
Reputation: 0

Unread postAuthor: n-strike » Fri Jun 13, 2008 6:41 pm

My chamber is 1 foot of 4" PVC, and my barrel is 2 1/2 feet of 4" PVC. Would mine be alright?

EDIT: Wait...I forgot this was Combustion...mine is Pneumatic...Anyone know the ratio for that?
  • 0

User avatar
n-strike
2nd Lieutenant
2nd Lieutenant
 
Posts: 219
Joined: Sat Apr 26, 2008 3:48 pm
Location: Richmond, BC, Canada
Reputation: 0

Previous

Return to Combustion Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'