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 58 users online :: 4 registered, 0 hidden and 54 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

Cannon fusing together?

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 

Is this safe?

No! Throw that thing away!
0
No votes
It's right as rain, just try to clean it.
0
No votes
Proceed with caution.
4
100%
 
Total votes : 4
  • Author
    Message

Cannon fusing together?

Unread postAuthor: Flying_Salt » Tue Nov 21, 2006 9:09 pm

I was doing some "quiet shooting" with some hairspray and after a particilarly loud blast, I had trouble getting my end cap off. After prying it off with a big wrench, I noticed a section that was browned and smoking a little. Is there something wrong?
  • 0

Attachments
DSC004461.JPG
Here is my end cap (sorry about my blurry camera).
DSC004481.JPG
Here is my chamber; the brown part was smoking a little.
sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Unread postAuthor: SpudStuff » Tue Nov 21, 2006 9:14 pm

You probably had a very good shot and the cap wasn't on good. The hairsray is like glue. That is why you cap was hard to get off.
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: nicholai » Tue Nov 21, 2006 9:15 pm

That sucker is burnt! This happens when a cannon is ignited with the cap off and continues to burn, it has been used a whole lot, or the cap/cleanout adaptor cooled much too quickly when molded which made the whole part(s) shrink. I would suggest tossing it away because you will probably end up blowing the cap(s) out. Typically the female threads are rendered useless by this point, the only option I know of is to cut the chamber where the cleanout adapter is and cement a new one on. This will shorten your chamber but save some pvc, especially if your barrel is not interchangable

edit: dammit spudstuff beat me to it. forgot to mention a loose cap
  • 0

Image
User avatar
nicholai
Captain
Captain
 
Posts: 349
Joined: Wed Jan 04, 2006 4:18 pm
Location: Maine
Reputation: 0

Unread postAuthor: Flying_Salt » Tue Nov 21, 2006 10:22 pm

Yeah I think I may have had it cross-threaded when I put it on or something. Putting a new adapter on will be a little tricky though. My sparker hole is very close to where my existing adapter is, so I would have to cut that off and drill a new one...
  • 0

sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Unread postAuthor: Flying_Salt » Tue Nov 21, 2006 10:25 pm

EDIT: This picture shows how close my sparker is to my adapter.

(I know it's generic, but it's my first one, so I'm kinda attached to it...)
  • 0

Attachments
DSC004191.JPG
sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Unread postAuthor: MisterSteve124 » Tue Nov 21, 2006 10:37 pm

Not much you could do without redrilling the holes. I say just try and clean out the threads with a triangular file or a razor blade. OR don't use hairspray. Or were you using hairspray because you wanted it to be more quiet?
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: mark.f » Wed Nov 22, 2006 7:51 am

Coat the threads on that cap with some teflon tape.

Heated air leaking through those threads at around 2,200 K, (just using propane as a model, hairspray probably burns colder), is bound to turn the female adapter brown, as well as burn the crap out of your hand if the leak gets bad enough.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: Flying_Salt » Wed Nov 22, 2006 3:36 pm

MisterSteve124 wrote: Or were you using hairspray because you wanted it to be more quiet?


Yes, that's why I said I was doing "quiet" shooting
  • 0

sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Unread postAuthor: squeaks » Wed Nov 22, 2006 4:30 pm

the only option I know of is to cut the chamber where the cleanout adapter is and cement a new one on.


ATENTION!!! YOU CAN SAVE YOUR FITTINGS/PIPE!!!!!

All you need to do is cut about 4 vertical slices in the pipe/fitting attached to the pipe/fitting you want to save. Then with a hammer and a screwdriver, you work the screwdriver between the two parts and pry. I suggest that you work the screwdriver in on several spots for each slice before prying. If you do this correctly the solvent weld will break like a hot knife cutting through butter............well, not exactly like a hot knife but you get the idea.
  • 0


squeaks
Captain
Captain
 
Posts: 326
Joined: Sun Oct 01, 2006 5:45 pm
Location: Enoch, UT(next to Cedar City)
Reputation: 0

Unread postAuthor: jrrdw » Wed Nov 22, 2006 4:50 pm

I'm no expert, but i was thinking that you got some hairspray on the threads themselfs, and with a loose fit it cought fire and melted the parts together. If it was mine i would cut as little off as possible and glue another one on, remount your sparker and your done. Happy shooting!

Is there a echo in here, (i hear chrickets cherping now).
  • 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: Flying_Salt » Wed Nov 22, 2006 4:59 pm

^^Yeah jrrdw probably has it
  • 0

sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
User avatar
Flying_Salt
Brigadier General
Brigadier General
 
Posts: 779
Joined: Mon Oct 09, 2006 4:57 pm
Location: Texas
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'