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 51 users online :: 4 registered, 0 hidden and 47 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

a few basic questions

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

a few basic questions

Unread postAuthor: irishguy » Fri Sep 21, 2007 8:36 pm

how long should my combustion chamber be if im using a 4ft 2inch barell and the standered orange pvc pipe chamber and also will butane work
  • 0


irishguy
Private
Private
 
Posts: 15
Joined: Fri Sep 21, 2007 8:13 pm
Reputation: 0

Unread postAuthor: DYI » Fri Sep 21, 2007 8:41 pm

You need a chamber that is about 120 ci if you are using metered propane. If you are using aerosol fuels, your chamber should be around 150 ci.
  • 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: frankrede » Fri Sep 21, 2007 9:09 pm

Orange pvc?
I have never heard of it?
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: Fnord » Fri Sep 21, 2007 9:37 pm

You mean orange pvc like this?

[youtube]http://www.youtube.com/watch?v=yAw2CofWBKY[/youtube]
  • 0

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

Unread postAuthor: trae08 » Fri Sep 21, 2007 9:42 pm

that actually looked like a ceramic pot... and it seemed like he expected the explosion to happen with all the stuff he was wearing and wrapping his leg up.
  • 0

Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

PCGUY wrote:Congrats, your the first donating member I have had to ban.
User avatar
trae08
Donating Member
Donating Member
 
Posts: 520
Joined: Sun Jul 09, 2006 2:14 pm
Location: florida
Reputation: 0

Unread postAuthor: Novacastrian » Fri Sep 21, 2007 10:02 pm

Orange pvc is electrical conduit i think, there would not be a pressure rating :? Might be fine for a combustion though- as long as i'm not using it!
Search "EVBEC" irishguy.

Welcome to Spudfiles :D

Edit: That guy is crazy, using a ceramic pot as a chamber.
I wonder if his name is DARWIN :lol:
  • 0


Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: irishguy » Fri Sep 21, 2007 10:43 pm

as far as i know here in ireland that is run of the mill sewer pipe and has a legal minunum requirement of 110 psi im not a 100% shure thow you cant get the white stuff here. also the pipe is more expencive it cost me 75 dollars to build my basic cannon so i should have a chaber about 2 ft long for a 4ft barell the barel is 2 inches and the chamber 4
  • 0


irishguy
Private
Private
 
Posts: 15
Joined: Fri Sep 21, 2007 8:13 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Novacastrian » Fri Sep 21, 2007 10:49 pm

My eyes hurt :( And my brain is burning :angry4:
Two words, spell-check.
Best of luck with your new launcher :)
  • 0


Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: MikeNice » Fri Sep 21, 2007 11:33 pm

not too sure about the pvc you are using but I've been doing 4" x 18" chambers for about 5 years with a 2" x 48" barrel. it's off a bit from the magical 1:1.5 C:B ratio but it works really well.
  • 0

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: jackssmirkingrevenge » Sat Sep 22, 2007 1:22 am

_Fnord wrote:You mean orange pvc like this?


Most succinctly put, touche :)
  • 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: turbohacker » Sat Sep 22, 2007 1:34 am

Novacastrian wrote:My eyes hurt :( And my brain is burning :angry4:
Two words, spell-check.
Best of luck with your new launcher :)


That was one word with a hyphen in the middle, please don't be a hypocrite. :roll:
  • 0

<-- This is not a cat avatar

If it walks like a dog, sratches like a dog, and barks like a dog, than its probobly a...-TURTLE, it's a TURTLE!!! Cant you see?!!!

frankrede wrote:Great googlay mooglay!
Thats a beast!
User avatar
turbohacker
Major
Major
 
Posts: 393
Joined: Wed Dec 20, 2006 12:34 am
Reputation: 0

Unread postAuthor: Novacastrian » Sat Sep 22, 2007 2:04 am

Purely for emphasis Turbo, however if you break down the word it could be taken both ways, meh
  • 0


Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Re: a few basic questions

Unread postAuthor: jimmy101 » Sat Sep 22, 2007 12:40 pm

irishguy wrote:how long should my combustion chamber be if im using a 4ft 2inch barell and the standered orange pvc pipe chamber and also will butane work


See this thread http://www.spudfiles.com/forums/viewtop ... tml#120201

Don't know what the diameter of "standerd orange pvc pipe" is so kind of hard to answer the question.

Assuming "standerd orange pvc pipe" is 4" ID and the barrel is 4 feet long piece of 2" pipe then the length of the chamber is about;
(0.80)*1<sup>2</sup>/2<sup>2</sup>*4' = about 10 inches.

If your are more than 12 years old you really should be able to do this kind of math yourself.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3128
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: spanerman » Sat Sep 22, 2007 1:35 pm

Hi, iff your are from the uk(or island) the orange soil pipe 'can' be used for combustions....but you would be better off looking for pressure rated pvc or solid wall abs pipe.....im sure the guys at www.uksgc.co.uk would be able to give you help on finding these pipes...
  • 0

Image

spanerman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 438
Joined: Sun Sep 17, 2006 2:54 pm
Reputation: 0

Unread postAuthor: dongfang » Sun Sep 23, 2007 3:47 am

Hi,

I Europe, orange PVC pipe is drain/sewer pipe for underground use.

It´s OK for fuel/air combustions up to 110 mm. I actually had an 40% oxygen enriched mix in one, and it didn´t blow up, BUT THAT MEANS JUST THAT I WAS YOUNG AND FOOLISH, NOT THAT I CAN RECOMMEND THAT PIPE FOR ANYTHING BEYOND PLAIN FUEL/AIR COMBUSTION GUNS. The experiment just confirmed that it could withstand twice the blast of a fuel/air combustion at least a few times, so I believe it is OK for a plain fuel/air combustion.

It is too weak for anything else, and as the movie shows, >> 110 mm is not strong enough for combustions either. The thing they used was a coupler for a large (> 200 mm it seems) sewer pipe.

Regards
Soren
  • 0

User avatar
dongfang
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 448
Joined: Sun Aug 27, 2006 8:02 am
Location: Switzerland
Reputation: 0

Next

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'