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 46 users online :: 5 registered, 0 hidden and 41 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [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

quick question

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 
  • Author
    Message

quick question

Unread postAuthor: jon_89 » Wed Mar 26, 2008 11:03 pm

I got a 7 foot piece of 1.5 inch abs and would would like to use it for my barrel but it is cell core. Does this matter for a barrel?
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: Hubb » Wed Mar 26, 2008 11:04 pm

It will be fine for a combustion.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: jon_89 » Wed Mar 26, 2008 11:05 pm

Ok thanks for answering so quick.
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: spudman029 » Thu Mar 27, 2008 11:46 am

As long as it is for the barrel, you will be fine. But please for the love of whatever religion you believe in, do not use cell core for the chamber.
  • 0


spudman029
Specialist
Specialist
 
Posts: 40
Joined: Wed Mar 19, 2008 1:36 pm
Location: Edmond, Oklahoma
Reputation: 0

Unread postAuthor: SpudFarm » Thu Mar 27, 2008 11:58 am

celluar core can be used in a basic...
  • 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

Fine

Unread postAuthor: Davedom6766 » Thu Mar 27, 2008 4:31 pm

as stated before this should be fine for a barrel as it does not recieve the brunt of the combustion

in a chamber it could be dangerous though
  • 0

Spudder Davedom6766

visit my unblocked game site: http://eastarcade.co.cc

http://thewebworld.org

Davedom6766
Private
Private
 
Posts: 8
Joined: Thu Mar 27, 2008 4:03 pm
Reputation: 0

Re: Fine

Unread postAuthor: jimmy101 » Thu Mar 27, 2008 7:50 pm

Davedom6766 wrote:as stated before this should be fine for a barrel as it does not recieve the brunt of the combustion

I heard people says this before and it makes no sense at all.

The barrel behind the spud is exposed to the exact same pressure as the chamber is. You can't use a lower pressure rating pipe for the barrel and expect it to hold up.

Cell core might be OK for a combustion, but it doesn't matter if you are talking about the chamber of the barrel, they both get exposed to the same pressures.

Heck, you could probably argue that the stress on the barrel is greater than on the chamber. There is a big-ass pressure gradient across the ammo. So the barrel has to deal with having 60 PSIG (or whatever) at one place in the pipe and ~15 PSIG just a couple inches away.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Re: Fine

Sponsored

Sponsor
 


Unread postAuthor: DYI » Thu Mar 27, 2008 7:54 pm

I wouldn't use cellular core PVC for a barrel on anything at all. Because the "big-ass pressure gradient" that Jimmy mentioned doesn't combine to well with the hazardous* failure properties of PVC.

Where did you find cellular core ABS anyway? The only stuff I can get around here is solid wall - I'd have to travel 5 hours away to get cellular core walled pipe if I wanted it for some reason.
  • 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: Jared Haehnel » Thu Mar 27, 2008 7:55 pm

Hey Jimmy or who ever else reads this...
Say I had a hybird made of metal pipe. The optimal barrel length was 20 feet. Would I be safe using metal pipe for the first bit of the barrel and then switch to the cheaper scedral 80 or 40?
My intuition says yes since the pressure lessens the further down the barrel the object goes due to expansion of the gasses. But I figured y'all might have some insight...
  • 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

Unread postAuthor: jon_89 » Thu Mar 27, 2008 7:57 pm

Well I was under my house running cable and found it awhile ago. There was also some one inch pvc that I used for my pneumatic. Though I finally pulled it out to do something with it.
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: jimmy101 » Fri Mar 28, 2008 3:35 pm

Jared Haehnel wrote:Hey Jimmy or who ever else reads this...
Say I had a hybird made of metal pipe. The optimal barrel length was 20 feet. Would I be safe using metal pipe for the first bit of the barrel and then switch to the cheaper scedral 80 or 40?
My intuition says yes since the pressure lessens the further down the barrel the object goes due to expansion of the gasses. But I figured y'all might have some insight...

Jared-
A gun really should be designed to take the maximum possible pressure that it might experience. In other words, the design should be able to handle the pressure if the round jams in the barrel. The chamber and entire barrel length should be able to handle that pressure.

It is too dangerous to design a gun any other way. If it fails you are going to be in a world of hurt. If it is a hybrid, it'll hurt even more.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: Bluetooth » Fri Mar 28, 2008 4:02 pm

Wow!!! Thats a lot of new people since I was last on here. If I were you, I wouldn't use cell core, but some people say it is ok for the barrel.
  • 0

User avatar
Bluetooth
Brigadier General
Brigadier General
 
Posts: 863
Joined: Tue Jun 27, 2006 7:57 am
Reputation: 0

Unread postAuthor: scottcrete » Fri Mar 28, 2008 4:10 pm

thats what i am talking about.. i do weird stuff like that too lol... use what i can find.. and dig in the dumpsters. for what i dont have at home... lol.. you will be amazed what you can get at lowes dumpster..

Is there anything wrong with dumpster diving? if you ask first?
one time when i lived in Beckley.. staples was remodeling their store. and i got 55 sheets of peg board.. and as many shelves as i wanted..

not that this is relavant to your pipe situation.. other than you found it under your house..

sorry for rambeling
  • 0

User avatar
scottcrete
Captain
Captain
 
Posts: 333
Joined: Tue Mar 18, 2008 1:26 am
Location: Bridgeport, West Virginia USA
Reputation: 0

Unread postAuthor: Spuddin » Fri Mar 28, 2008 4:20 pm

bro i would not use cell core for a barrel. and scott, there is nothing wrong with dumpster diving, i have earned my dd degree long ago and found so much cool stuff.
  • 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: STHORNE » Fri Mar 28, 2008 4:22 pm

If there weren't dumpsters, I would be a poor man right now. (as i would have to actually buy all my stuff)
  • 0

Forum Rules - follow them or else!
“Happiness is the meaning and the purpose of life, the whole aim and end of human existence”
User avatar
STHORNE
Donating Member
Donating Member
 
Posts: 1208
Joined: Wed Feb 14, 2007 7:50 pm
Location: Kewaunee, Wisconsin
Reputation: 0

Next

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'