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 42 users online :: 3 registered, 0 hidden and 39 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

50 gal. barrel noisemaker help please

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

50 gal. barrel noisemaker help please

Unread postAuthor: jean » Wed Dec 23, 2009 4:31 am

hi

i get one of this plastic barrel.
to get a big bang i will fill it with metered propane ignite it and .....booom

only problem is i dont have the top lid and i need a resonable bursk disk

any ideas here?

also a question do you think i can get more than one shoot out of them or will it destroy after the first shoot

by
  • 0

Attachments
950012022200_100.jpg
950012022200_100.jpg (29.14 KiB) Viewed 764 times

jean
Staff Sergeant
Staff Sergeant
 
Posts: 125
Joined: Thu Dec 13, 2007 12:23 pm
Reputation: 0

Unread postAuthor: bradisfun » Wed Dec 23, 2009 6:47 am

umm y are u doing this???
  • 0


bradisfun
Corporal
Corporal
 
Posts: 77
Joined: Thu Nov 12, 2009 5:48 pm
Reputation: 0

Unread postAuthor: Heimo » Wed Dec 23, 2009 6:59 am

bradisfun wrote:umm y are u doing this???

it seems he wants to make noise.

I would say this is a bad idea but I cannot give you any real reasons why I think so
if you absolutely have to do this cover the top with something like a plastic tarp or something that would not allow too much pressure to be generated
  • 0

User avatar
Heimo
2nd Lieutenant
2nd Lieutenant
 
Posts: 242
Joined: Sun Oct 25, 2009 3:02 pm
Reputation: 0

Unread postAuthor: cameroncoats » Wed Dec 23, 2009 9:20 am

Burst disk - 5-10 layers of plastic wrap stuff.

You need to get hold of an end cap and put a barrel on this! :twisted:
  • 0


cameroncoats
Private
Private
 
Posts: 2
Joined: Mon Jul 27, 2009 6:12 pm
Reputation: 0

Unread postAuthor: jrrdw » Wed Dec 23, 2009 10:23 am

Propane is heavier then air so it sinks. Leave the top open and start with a small amount, stir, stand back and ignite it. I think you will be surprised in the amount of noise it will make. Test different amounts, but all ways ignite it remotely, there will be a big ball of fire coming out.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: jackssmirkingrevenge » Wed Dec 23, 2009 10:46 am

I think any plastic wrap will do, or a few layers of kitchen foil tied down with duct tape.
  • 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: Joshatdot » Wed Dec 23, 2009 12:26 pm

Plastic paint drop cloths, or yard waste garbage bags. I think tarps would be too thick.

drop in a 120mm computer chamber fan with 9v battery taped to it or summat to mix it all, and one of those hobby rocket ignition things...BOOM
  • 0

Potato Cannon V3 - Spray & Pray .. soon to be converted to metered propane & chamber fan.
User avatar
Joshatdot
Private First Class
Private First Class
 
Posts: 29
Joined: Thu Oct 15, 2009 2:38 am
Location: Anacortes, WA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: psycix » Wed Dec 23, 2009 2:12 pm

Propane is heavier then air so it sinks.

I believe gases don't "sink"
Over time, they will mix into a homogeneous mixture and can't be split by gravity.

My recommendation:
-Burst disk. Just find something that's cheap and put on easily.
-Chamber fan. A must. Good mixing will make sure you'll have a bang.
-Metering. For optimal performance, if you want.
-Multiple spark gaps. Further performance enhancement.

The faster it burns, the more it makes a BANG instead of a WOOSH.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: SpudBlaster15 » Wed Dec 23, 2009 3:14 pm

psycix wrote:I believe gases don't "sink"
Over time, they will mix into a homogeneous mixture and can't be split by gravity.


Yep, mixtures of gases do not behave in the same manner as liquids. Entropy ensures that multiple gases placed in a container will eventually mix completely, and not separate into layers based on density as liquids do.

As for a burst disk, a plastic tarp duct taped over the top of the barrel would work well.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: jrrdw » Wed Dec 23, 2009 3:24 pm

psycix wrote:I believe gases don't "sink"
Over time, they will mix into a homogeneous mixture and can't be split by gravity.


If you open a valve and let propane out of it's container, where does it go? Does it float up into the air? Does it sink to the ground? Plain and simple, which direction does it go?
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: artillerycreations » Wed Dec 23, 2009 3:58 pm

Same as stage fog from dry ice. Or nitrogen gas coming off liquid nitrogen. Being heavier than air it sinks. Given time it will mix together just as when you breathe you dont breathe straight nitrogen but a homogeneous mixture of all gasses mixed together.
  • 0


artillerycreations
Specialist
Specialist
 
Posts: 46
Joined: Wed Dec 23, 2009 2:38 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 23, 2009 4:11 pm

jrrdw wrote:If you open a valve and let propane out of it's container, where does it go? Does it float up into the air? Does it sink to the ground? Plain and simple, which direction does it go?


Some discussion of the subject here.
  • 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: Willdebeers » Wed Dec 23, 2009 4:17 pm

I personally think that this would rather end up like this, which is rather unfortunate. I would rather use some big-ass pressure pvc...
  • 0

Image
User avatar
Willdebeers
2nd Lieutenant
2nd Lieutenant
 
Posts: 214
Joined: Tue Feb 03, 2009 1:18 pm
Reputation: 0

Unread postAuthor: jrrdw » Wed Dec 23, 2009 5:17 pm

Just remember to experiment safely regardless how you go about doing this. :wink:

Thanks JSR but I really wasn't looking for a discussion on what propane does when you let it out of it's container...I all ready know that it sinks. Yes it mixes with the other gases in it's environment, just the simplicity that it does indeed sink as I stated above.

I'm now wondering what kind of and how much punishment these plastic barrels can take. They are flexible, but how many times before it burst where you don't want it to.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: jean » Wed Dec 23, 2009 6:39 pm

thx guys

yes i plan it to do in the future

do you really think a simple layer from tarp will work??
the open end of the barrel is mh ~20 inch

my first plan was to close the end with a plastic waterball but i know the noise is far better with a "strong" bursk disk
so i think with a 1/4 thick plywood !?!?

the wall thickness is between ~4 and ~8mm material is PET same as coke bottles are made from
  • 0

Attachments
Unbenannt.JPG
Unbenannt.JPG (20.95 KiB) Viewed 573 times

jean
Staff Sergeant
Staff Sergeant
 
Posts: 125
Joined: Thu Dec 13, 2007 12:23 pm
Reputation: 0

Next

Return to Non-Spudgun Related Discussion

Who is online

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

Reputation System ©'