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 86 users online :: 4 registered, 0 hidden and 82 guests


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

Registered users: Bing [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

mk 5

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

mk 5

Unread postAuthor: domino » Sat Mar 05, 2011 9:09 am

barrel is 29" long and 1.5" wide
chamber is 18" long and 3" wide

Could the chamber be too long? its unreliable to say the least. But when it does work, it really does bang!
Ive tried several different ignitors but found an AA battery operated rapid spark thing works best
ive made several others in the past (electrical tape specials that lasted 5 minutes) and they all worked fine, just cant figure out why this ones so unreliable
[/img]Image

Uploaded with ImageShack.us
[img][img]http://img716.imageshack.us/img716/8010/img2156p.jpg[/img]

Uploaded with ImageShack.us[/img]
  • 0


domino
Private
Private
 
Posts: 4
Joined: Thu Mar 03, 2011 7:45 pm
Reputation: 0

Unread postAuthor: Gaderelguitarist » Sat Mar 05, 2011 10:35 am

So I'm guessing that this is a combustion. The chamber includes that strange yellow corrugated tube.

You can shorten the chamber without any noticeable performance drop. Larger chamber/ barrel ratios make for louder cannons.

Unreliability can be caused by many factors, induvidual or coinciding. The most common problem with combustions is getting an ideal fuel mixture for combustion to occur. Do you have a way of metering your fuel, or are you simply using a can of aeresol propellant?

Looks like a unique build. Welcome to Spudfiles.
  • 0

so many muchness
User avatar
Gaderelguitarist
Colonel
Colonel
 
Posts: 580
Joined: Sat Aug 16, 2008 9:56 pm
Location: Columbia, MD
Reputation: 0

Unread postAuthor: Crna Legija » Sat Mar 05, 2011 11:12 am

do you have a fan? its the #1 upgrade for a combustion cannon. that think looks mean as hell
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Unread postAuthor: saefroch » Sat Mar 05, 2011 11:51 am

Are you metering fuel? If you're not, changes in temperature will throw off spray 'n' pray fueling by a huge margin (personal experience), which will become very significant with such a large chamber (personal experience).
  • 0

User avatar
saefroch
Major General
Major General
 
Posts: 1679
Joined: Mon Jun 08, 2009 8:47 am
Location: U.S.A.- See Map
Country: United States (us)
Reputation: 0

Unread postAuthor: Technician1002 » Sat Mar 05, 2011 12:02 pm

Getting fuel to properly mix the length of a long chamber is difficult. Adding some kind of spray paint agitator ball and then shaking thoroughly to mix the contents helps in long chambers without a fan. A 1 inch bouncy ball may do the trick. Proper venting (completely) between shots is a must. Adding fuel to an oxygen free chamber of spent gas won't work well.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: jackssmirkingrevenge » Sat Mar 05, 2011 12:07 pm

two objections if I may:

1) feet

2) What is that tubing connecting the chamber to the barrel.

Have you tried syringe fuel metering :D
  • 0

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: Fnord » Sat Mar 05, 2011 2:10 pm

Is that...
a vacuum cleaner hose??
  • 0

Image
User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Sponsored

Sponsor
 


Unread postAuthor: domino » Sun Mar 06, 2011 7:57 am

The hose is just some thick rubber tubing i found lying around. Theres no fuel meter or fan, just spray and prey.
Would shortening the chamber do the trick?
i have a pc fan but its just too big
  • 0


domino
Private
Private
 
Posts: 4
Joined: Thu Mar 03, 2011 7:45 pm
Reputation: 0

Unread postAuthor: mark.f » Sun Mar 06, 2011 9:11 am

domino wrote:spray and prey

I like the way you think.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3464
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Crna Legija » Sun Mar 06, 2011 10:15 am

As tech said, put something in the chamber and shake it around. Cutting down the chamber may help but if it doesn't then you will have a less powerfu,l unreliable cannon. So your better off trying to mix the full better and use a bit less/more fuel
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'