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 53 users online :: 5 registered, 0 hidden and 48 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Launcher Failure Analysis Log

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Unread postAuthor: Velocity » Tue Aug 21, 2007 11:34 pm

Yeah... PVC hybrids scare me like crazy. Hell, I even get a little nervous around PVC pneumatics. Good thing you are OK... you are OK, right?
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: noname » Wed Aug 22, 2007 11:56 am

I'm fine, as I was standing next to the barrel when I shot it. I'll probably scrounge the union and use it in a pneumatic, but I'm never making any PVC hybrid again.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: iknowmy3tables » Fri Sep 14, 2007 3:24 pm

I never made my inside out sleeve valve because I didn't know how to use o-ring, most important of all don't try gluing them in place, second if its your first time buying pvc cement don't ask the store asistants, thats how I put teflon paste on all my fittings for a failed gun, I reuse a lot of it and I forget that one of the fitting was not actully cemented so it blew off in my face
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: MikeNice » Fri Nov 30, 2007 9:42 pm

No pics, bummer, I had a barrel blow up on one of my over / under PVC cannons. It was sched 80 2" PVC. Fired successfully many, many times.
It failed around the union. I think the failure had more to do with the possibility of damaged pvc. I seem to remember that barrel falling off my work bench to the concrete floor. Possibly micro-cracked? Not sure. Needless to say the exploding barrel was a surprise although th PVC didn't explode like some say PVC goes. It broke into about 6-8 large pieces that flew a max of about 15 feet. No one was hurt more than a little cut on my forearm. I think the failure was the perfect storm of a tight spud, perfect fuel / air mixture, and damaged pipe. Spud was no where to be found. The good news is that the cannon wasn't damaged at all and is still in use today. This gun is about 3 years old and still of the same piezo! This is the only failure any of my guns have had. (knock on wood)
  • 0

Your face is going to freeze like that. http://iplaaz.freehostia.com/
User avatar
MikeNice
Staff Sergeant
Staff Sergeant
 
Posts: 115
Joined: Tue Nov 28, 2006 4:37 pm
Location: Queen Creek, AZ
Reputation: 0

Unread postAuthor: dapaintballer331 » Mon Jan 21, 2008 8:54 pm

I made a gun out of a UTZ Pretzel Jar, 2 Liter, and a Metal Pole from a pinball machine (leg).

A strawberry was loaded, but the explosion was enough to shoot the barrel off. Somehow, the pretzel>2 liter connection held perfectly.

2 Liter Bottles > Strong
UTZ Pretzel Jars > WEAK
Duct Tape > Weak

Before:
Image
Image

After:
Image
( /|\ Is just a pic of the lighter going off, so you can see the igniter, and how the back exploded)
Image
Image
When the back blew off, no one was standing behind me (it was shoulder mounted) so it didn't hurt anyone.
  • 0

Last edited by dapaintballer331 on Mon Jan 21, 2008 9:01 pm, edited 2 times in total.

dapaintballer331
Private
Private
 
Posts: 6
Joined: Tue Jan 01, 2008 2:30 am
Reputation: 0

Unread postAuthor: Isomer » Mon Jan 21, 2008 9:00 pm

Pictures of animals being hurt as the result of spud gunning is not allowed in these forums i think, although the picture does look a bit fake.
  • 0

User avatar
Isomer
Sergeant
Sergeant
 
Posts: 81
Joined: Fri Jan 04, 2008 9:35 pm
Reputation: 0

Unread postAuthor: Spitfire » Fri Jan 25, 2008 8:26 am

My Cousins combustions, chamber failed on him here the pics(He requested that i add them before he rebuilds it, as he doesnt have ADSL)
Pipe was pressure rated
  • 0

Attachments
Accident.jpg
User avatar
Spitfire
2nd Lieutenant
2nd Lieutenant
 
Posts: 202
Joined: Fri Nov 16, 2007 5:34 am
Location: South Africa
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: DYI » Fri Jan 25, 2008 9:14 am

That pipe doesn't look very sturdy. Also, with such a thin walled and obviously flimsy chamber, putting a hole in a single layer of pipe for the igniter wasn't a very good idea. This failure would seem to be the result of using materials of inadequate strength.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: rcman50166 » Sun Jan 27, 2008 4:24 pm

I agree. The pipe used looks way to thin to absorb shock. However if it is pressure rated I'm sure it wasn't shock rated which mean it would be able to hold pressure, just not in quick bursts. The ignitor is obviously the problem in this photo. The origin in the crack is traced diretly back to the ignitor.
  • 0

User avatar
rcman50166
Colonel
Colonel
 
Posts: 697
Joined: Sat Jan 19, 2008 7:11 pm
Location: Bethel, CT
Reputation: 0

Unread postAuthor: Isomer » Sun Jan 27, 2008 5:31 pm

what kind of pipe is that blue stuff? ive never seen it before
  • 0

User avatar
Isomer
Sergeant
Sergeant
 
Posts: 81
Joined: Fri Jan 04, 2008 9:35 pm
Reputation: 0

Unread postAuthor: Spitfire » Mon Jan 28, 2008 7:45 am

Its pipe we use in sa For irrigation, pump water from a dam up to a Orhid. Will find out what pipe
  • 0

User avatar
Spitfire
2nd Lieutenant
2nd Lieutenant
 
Posts: 202
Joined: Fri Nov 16, 2007 5:34 am
Location: South Africa
Reputation: 0

Unread postAuthor: Spitfire » Fri Feb 29, 2008 2:37 pm

6 bar pipe, 85psi
  • 0

User avatar
Spitfire
2nd Lieutenant
2nd Lieutenant
 
Posts: 202
Joined: Fri Nov 16, 2007 5:34 am
Location: South Africa
Reputation: 0

Unread postAuthor: SpudFarm » Fri Feb 29, 2008 2:53 pm

and a closed combustion chamber produces 120...
  • 0

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: Spitfire » Fri Feb 29, 2008 3:05 pm

yet i use normal drain pipe...I think.... No problems so far
  • 0

User avatar
Spitfire
2nd Lieutenant
2nd Lieutenant
 
Posts: 202
Joined: Fri Nov 16, 2007 5:34 am
Location: South Africa
Reputation: 0

Unread postAuthor: Jared Haehnel » Fri Mar 07, 2008 8:35 am

Here one that happened a while ago and it was my fault.

I got overly excited about my new combustion and shot the gun before the glue had dried long enough. It made one heck of an explosion and blew the barrel straight of the end of the chamber. The fire singe my eye brows and burnt of a bunch of arm hairs. The kick was pretty serious and the potato went who knows where but it wasn't in the barrel.

Luckily I wasn't seriously injured I hope someone else can read this and have the patience to wait for the glue to set up before shooting it off. The explosion sounded like a gun shot and had my parents running...

I fixed the gun and its been the best combustion I have made to date... but if there's a moral its wait!

If only we could use the fumes from the primer and glue....I wonder how good of a fuel it would make?
  • 0

My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
Reputation: 0

PreviousNext

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'