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 79 users online :: 4 registered, 0 hidden and 75 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

6' barrel combustion

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

6' barrel combustion

Unread postAuthor: jagerbond » Fri Aug 01, 2008 5:54 am

Hey fellow spuders,
figured I'd share my latest incarnation. 6' barrel and 30" chamber with the usual fuel and igniter goodies. Shoots far!
  • 0

Attachments
6'barrelsmall.jpg
User avatar
jagerbond
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Tue Jul 29, 2008 5:33 am
Location: Hawaii
Reputation: 0

Unread postAuthor: SpudFarm » Fri Aug 01, 2008 6:24 am

more specs and you used DWV :roll:
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: jrrdw » Fri Aug 01, 2008 6:44 am

Welcome to Spudfiles.

Cannon looks good. You have more cannons that you can show us? Please post them.



and you used DWV
It's been said so no parroting guys!
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: SpudFarm » Fri Aug 01, 2008 6:46 am

does it have a breech loading system? there is a copuling on the barrel
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: TwitchTheAussie » Fri Aug 01, 2008 6:59 am

SpudFarm wrote:more specs and you used DWV :roll:


I'd like to point out DWV has a good shock resistance meaning it can sustain pressure spikes of around a standard combustion. I have made several from DWV and Im yet to have a failure entirely due to the DWV.

However I digress. I love it mate keep up the good work.
  • 0

Raise your horns if you love metal.
spudgunning is like sex, once you've tasted, you can't wait til next time.
-
CpTn_lAw
User avatar
TwitchTheAussie
Brigadier General
Brigadier General
 
Posts: 980
Joined: Tue Feb 06, 2007 3:23 am
Reputation: 0

Unread postAuthor: jonnyboy » Fri Aug 01, 2008 7:46 am

Nice cannon dude.

@spudfarm I think its to change barrels. It seems like a hassle to have to unscrew it every shot, especially with the barrel supports.
  • 0

User avatar
jonnyboy
Colonel
Colonel
 
Posts: 591
Joined: Mon May 26, 2008 1:20 pm
Location: Williamston MI USA
Reputation: 0

Unread postAuthor: pizlo » Fri Aug 01, 2008 8:44 pm

Wierd two new guys posting advanced combustions in one day...
Verry nice gun, do you shoot anything other than taters?
  • 0

User avatar
pizlo
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Dec 22, 2006 7:27 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: starman » Fri Aug 01, 2008 8:57 pm

That's one big A combustion you've got there. Absolute performance would have to be pretty decent by default.

"Ignitor goodies" does not adequately describe your setup there. Did you install a fan? Stun gun or BBQ ignitor, spark gap setup...?

Pretty clean job on the construction. You should should go into a little more detail on your write-up.
  • 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: jagerbond » Mon Aug 04, 2008 4:53 pm

Thanks for your responses. Yes there are some DWV pieces on it in an attempt to have a more fluid curve for expanding gasses. The DWV parts seem as robust as the ones used for pressure, but some have less connection area for gluing.

The igniter is from a grill at the junkyard. It takes a AA battery and has 2 leads. Both leads will spark to ground, but directed towards each other jump over 1/2". There is a small momentary switch zip tied to the handle.

The metering system is made of 3/4" pipe and valves and one cut up bernzomatic torch. Originally I thought I would need a regulator, which is on the gun, but the Bernz regulates to any PSI up to 60. So I am using the reg thats on it for the gauge only. 3X the meter rod at 50PSI seems to be the strongest, at least feel and sight wise. Does anyone have recommendations for a chrony that works (space to fire through) speeding spuds?

The coupling at the base of the barrel is a result of changing the barrel length, originally it was 4' and after being introduced to the spud files, I realized I needed more internal barrel area because my chamber is so big. Its probably too big for the 6' barrel too. I know this has been a hot topic of discussion, but what is optimal chamber to barrel ratio? 1.5C to 1B?

I have not introduced a fan yet. i've been using compressed air for venting and shaking the gun for mixing. I am working on modifying a pull starter to make a manual chamber fan.

I'll post a photo of a coaxial I built later. It was more proof of concept than anything. I'm building a large coaxial this weekend as long as the parts arrive on Thursday. It will get the metering goods and ignition like the above and will feature 12' x 2" barrel and 31" x 6" chamber. What's the max distance for combustion spud guns that have been posted here?
  • 0

User avatar
jagerbond
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Tue Jul 29, 2008 5:33 am
Location: Hawaii
Reputation: 0

Return to Combustion Cannon Database

Who is online

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

cron
Reputation System ©'