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 67 users online :: 3 registered, 0 hidden and 64 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

optimal fan placemeant in specialized cannon

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

optimal fan placemeant in specialized cannon

Unread postAuthor: singularity » Sun Jan 13, 2008 11:44 pm

for quite some time now i have been working on my newest cannon the mortar mk 2. its basically an automated combustion cannon meant for airsoft skirmishes. the primary ammo is meant to be "airsoft grenades" made from water bottles. all i can say about these "grenades" is they will be used as mortar rounds and they literally exploded (but they have undergone intense testing and cannot harm anyone unless they were actually holding them with bare hands)

but onto the question, were would be the best place to mount a small 40mm chamber fan meant only mix the the fuel and air? i was thinking right at the propane meter inlet but was not completely sure.

secondary side question: i need to go from 3in pipe to the diameter of a water bottle (approx. 65mm) but putting a second piece of 3in pipe within it would make the barrel about 3mm to small. any ideas on how to make the barrel the correct diameter?

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN3214.jpg">

here is a picture of the entire cannon its basically a piece of 3 in pipe with a clean out attached. on the pipe there is a solenoid propane meter and a stungun in a custom housing with a key ignition. connected to the propane meter you can see the green gas chamber i removed from an airsoft pistol and modified to fit in a standard ball valve. behind the cannon you can see the metal brackets which will become the mortar's support. i have already programmed the micro controller which will work this thing so basically the only thing i need is a barrel and a couple switches.
  • 0

be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
User avatar
singularity
Brigadier General
Brigadier General
 
Posts: 982
Joined: Mon Jun 26, 2006 10:53 pm
Location: someplace
Reputation: 0

Unread postAuthor: hi » Mon Jan 14, 2008 12:45 am

i put the fans in the rear of the cannon and have it blow out of the cannon. this saves the fan (it lives longer for some reason) and it helps exhaust the gas after its been fired..


as for the barrel, cut a strip out of the barrel (literally a strip down the entire length of the barrel), then remove the strip and use hose clamps to close the gap in the barrel. crude, but it works.you just have to be careful when you do it.

another solution is to wad it with paper or foam, but that is very obvious.

edited to a that- if you look up my "advanced" combustion in the showcase, it too has a 40mm fan in a 3'' pipe. its at the rear and work great.
  • 0

Last edited by hi on Mon Jan 14, 2008 12:51 am, edited 1 time in total.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: Maniac » Mon Jan 14, 2008 12:48 am

ohh finnaly we get to see the long awited auto mortar. :D :D I have been long awaiting this as you can tell. I cant wait to see the results from this thing. Im glad you didnt waist those AEG motors on the venting.Onto the question... i would mount it toward the inlet but not right next to it so it would be circulating all of the air equally.( It probably doesnt matter to much where you put it.)
  • 0

Coodude26 wrote:
People who laugh really hard at stuff that pisses you off/you getting hurt, who then say "I'm sorry, I can't stop" but you know they easily could.

Mr.C: That's not as easy as you think. It's like me kicking you in the balls and telling you to stop crying.
User avatar
Maniac
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 496
Joined: Tue Oct 23, 2007 5:55 pm
Location: Right behind you
Reputation: 0

Unread postAuthor: singularity » Mon Jan 14, 2008 1:25 am

hi - the "cut strip then shove inside method" (as ill call it) wont work thats what i was talking about when i said 3mm to thick

maniac - im glad to see someone other than myself is excited about this project
  • 0

be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
User avatar
singularity
Brigadier General
Brigadier General
 
Posts: 982
Joined: Mon Jun 26, 2006 10:53 pm
Location: someplace
Reputation: 0

Unread postAuthor: ALIHISGREAT » Mon Jan 14, 2008 2:51 am

hmm a sabot is probably the best option or you could find different bottles?
  • 0

User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: Novacastrian » Mon Jan 14, 2008 3:17 am

My suggestion is toward the rear of the chamber. I think that this works best because the gases are traveling towards the front of the chamber- hence fan at back would escape most of the hottest gases. Just my 2 cents.
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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

Unread postAuthor: rna_duelers » Mon Jan 14, 2008 5:20 am

Like Nova Said-Towards the rear of them chamber,and what ever you do don't put it in front of the spark gap or good by fan.

The injection nozzle looks like it is towards the rear of the chamber as well so it would make sense to mix the fuel from the point of entry.Have it venting out towards the barrel because heat rises and so do hot gasses,so it's better to be helping them vent out the barrel with the fan and it can also draw in fresh air easily.
  • 0

Image
User avatar
rna_duelers
Major General
Major General
 
Posts: 1740
Joined: Mon Sep 26, 2005 7:07 am
Location: G-land Australia
Country: Australia (au)
Reputation: 1

Sponsored

Sponsor
 


Unread postAuthor: psycix » Mon Jan 14, 2008 6:56 am

When putting a fan near the barrel, all air from the chamber has to pass the fan to enter the barrel.
This is not good since the insane airflow on that point will cause the fan to break quickly and also block flow a little.
Near the back of the chamber is better and also like RNA said: place is somewhere near the fuel-injection point.
  • 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

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'