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 63 users online :: 4 registered, 0 hidden and 59 guests


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

Registered users: Bing [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

Design advice, would this work?

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

Design advice, would this work?

Unread postAuthor: vng21092 » Sun Apr 27, 2014 7:24 pm

Hey guys, so this is an outline of what I want to build
Image
Chamber will be 1 1/4'' x 6'', barrel will be 1/2'' x 24'' sleeved inside of a 1 1/4'' pipe, 8'' of the 24'' will have holes drilled into it to act as a suppressor. The 1 1/4'' sleeve will be filled with steel wool, would this work well? Any advice to change the design for better efficiency would be greatly appreciated.
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: Technician1002 » Sun Apr 27, 2014 11:32 pm

If it is combustion don't use steel wool.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Re: Design advice, would this work?

Unread postAuthor: vng21092 » Mon Apr 28, 2014 5:25 am

what should I use then?
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: mobile chernobyl » Mon Apr 28, 2014 8:06 am

Fiberglass mat would work well. Try and find something denser then the blown wall insulation.
  • 0

User avatar
mobile chernobyl
Colonel
Colonel
 
Posts: 732
Joined: Sun Dec 03, 2006 11:53 am
Reputation: 9

Re: Design advice, would this work?

Unread postAuthor: jackssmirkingrevenge » Mon Apr 28, 2014 9:24 am

mobile chernobyl wrote:Fiberglass mat would work well. Try and find something denser then the blown wall insulation.


For a combustion, one of the things you want to do is absorb heat, so fibreglass matt would not really contribute.

Get your hands on this stuff, and a tub of lithium grease.

I recommend watching this video:

  • 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

Re: Design advice, would this work?

Unread postAuthor: vng21092 » Mon Apr 28, 2014 3:22 pm

can someone explain whats wrong with steel wool? I see that recommended in other threads here. Also, what is the point of those rings that kind of split up the inside of the siencer into different sections? Baffles I think they're called? Are they necessary?
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: wyz2285 » Mon Apr 28, 2014 3:54 pm

Is this for a combustion, hybrid or pneumatic?
If it's for pneumatic forget the steel wool and use baffles.
If it's for combustion or hybrid, steel wool is fine but copper wool conducts the heat better so it performs better at cooling the gas.
  • 0

Last edited by wyz2285 on Mon Apr 28, 2014 4:06 pm, edited 1 time in total.
CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Re: Design advice, would this work?

Sponsored

Sponsor
 


Re: Design advice, would this work?

Unread postAuthor: vng21092 » Mon Apr 28, 2014 4:00 pm

combustion, so copper wool it is
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: wyz2285 » Mon Apr 28, 2014 4:06 pm

Having a few baffles is still a good idea though, they help slow down the gas a lot, giving more time for the heat to dissipate to the copper wool and surrounding structure.
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Re: Design advice, would this work?

Unread postAuthor: jackssmirkingrevenge » Mon Apr 28, 2014 4:08 pm

Fine steel wool is also prone to at best disintegrating after being subjected to combustion gasses, at worst bursting into flames.
  • 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

Re: Design advice, would this work?

Unread postAuthor: vng21092 » Mon Apr 28, 2014 6:25 pm

are the baffles just empty space or are they filled with insulation as well?
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: wyz2285 » Mon Apr 28, 2014 6:29 pm

They are just empty spaces. Seriously, watch that video Jack posted, it will show everything you need to know.
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Re: Design advice, would this work?

Unread postAuthor: vng21092 » Mon Apr 28, 2014 8:40 pm

hmm just watched the video, still don't understand why there are multiple baffles, why not just have one long baffle?
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Re: Design advice, would this work?

Unread postAuthor: jackssmirkingrevenge » Mon Apr 28, 2014 11:02 pm

The baffles are the separators, not the spaces in between.

Have a look at this impressive high speed footage of what is going on inside a modern suppressor:





Each baffle creates turbulence, which gives the gasses more time to cool as well as making the passage more difficult for the gas which follows. A suppressor with no baffles is generally much less effective.
  • 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

Re: Design advice, would this work?

Unread postAuthor: vng21092 » Tue Apr 29, 2014 9:41 am

When making a silencer, would the length of the silencer count as part of the barrel? Would a 16'' barrel with a 8'' silencer count as a 24'' barrel? I'm planning on having a 1:1 C:B ratio, would it be a horrible idea to port the whole length of the barrel and sleeve it with insulation?
  • 0


vng21092
Master Sergeant
Master Sergeant
 
Posts: 163
Joined: Tue Nov 19, 2013 8:27 pm
Country: United States (us)
Reputation: 6

Next

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'