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 36 users online :: 5 registered, 0 hidden and 31 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

cartridge fed combustion build log

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

cartridge fed combustion build log

Unread postAuthor: jackssmirkingrevenge » Wed Jan 20, 2010 12:07 pm

I've decided to revisit this idea, here's what I have so far, looks promising :D

[youtube]http://www.youtube.com/watch?v=eO8PX_xOefY[/youtube]

How's that for blowback :D took the ignitor right out of my fingers hehe

That was done with just a loose fiting marker cap as ammunition, there should be plenty of power to cycle a semi-automatic action. now to build the breech, watch this space.
  • 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: JDP12 » Wed Jan 20, 2010 1:08 pm

hahah AWESOME JSR!!!!!!!!!

That'll definitely help me out with my project. I just need to get some glue!!!!

Congratulations on a great success.

However you may need to look into a better sealing method, you lost alot of pressure since the cartridge blew out before it even had a chance to fire--hence the massive fireball at the breech
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Jan 20, 2010 1:21 pm

JDP12 wrote:However you may need to look into a better sealing method, you lost alot of pressure since the cartridge blew out before it even had a chance to fire--hence the massive fireball at the breech


The cartridge is an extremely good fit in the breech, naturally because it's cast around it. I wrapped some packaging tape to allow for a slightly greater cast but we're talking about one thickness of tape, I'm not worried about the seal. Consider that in the case of the above test there was absolutely nothing holding the cartridge or breech other than their own weight, and also the projectile was extremely light and loose fitting (about 0.74") - knew from my previous cartridges that there would be blowback and I didn't want it to be too powerful, this was more of an ignition test.

Building the breech as we speak, I'm hoping to have it done within the next few days. If that works well I'll add a magazine and see how that goes.
  • 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: JDP12 » Wed Jan 20, 2010 1:24 pm

ah, very true. Good points...

Stupid glue!!
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: potatoflinger » Wed Jan 20, 2010 1:53 pm

Can't wait to see it in action. How many shells are you planning on making?
  • 0

It's hard to soar with eagles when you're working with turkeys.
User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: jackssmirkingrevenge » Wed Jan 20, 2010 2:16 pm

potatoflinger wrote:How many shells are you planning on making?


Since they're so big the stick magazine I'm planning won't hold more than 4-5 so probably not more than that.
  • 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: psycix » Wed Jan 20, 2010 2:45 pm

In that case go for 8-10 and be able to swap magazines. ;)
  • 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

Sponsored

Sponsor
 


Unread postAuthor: JDP12 » Wed Jan 20, 2010 3:29 pm

very nice, i may just have to step up to a 1.25" shell and make a grenade launcher--

something like this

or what the heck screw pump action and just go with semiautomatic :D
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jan 21, 2010 2:10 am

psycix wrote:In that case go for 8-10 and be able to swap magazines. ;)


I was thinking of a fixed magazine for the sake of simplicity.

or what the heck screw pump action and just go with semiautomatic


I think semi-auto through a straight blowback action is by far the easiest to achieve, pump action through an underbarrel tube magazine is a far more complex operation to undertake.

The basic breech is ready but I'm going to slop on a lot more epoxy tonight to make sure it's up to the strain, hopefully by the time I'm ready to test it my latest media purchase would have arrived and I can offer some high speed footage :)
  • 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: Insomniac » Thu Jan 21, 2010 4:59 am

jackssmirkingrevenge wrote:In that case go for 8-10 and be able to swap magazines. The basic breech is ready but I'm going to slop on a lot more epoxy tonight to make sure it's up to the strain, hopefully by the time I'm ready to test it my latest media purchase would have arrived and I can offer some high speed footage :)


I'm looking foward to it. I'm interested to see at what point the cartriage detaches, relative to the movement of various projectiles. Any chance of a transparent barrel to better see what's going on? Perhaps you could cast one out of epoxy :lol:
  • 0

I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
User avatar
Insomniac
Major General
Major General
 
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia
Country: Australia (au)
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jan 21, 2010 6:15 am

Insomniac wrote:Any chance of a transparent barrel to better see what's going on? Perhaps you could cast one out of epoxy :lol:


It's not impossible, I have cast tubes before;) but I have enough on my plate making the breech block for this thing at the moment. Tomorrow I should have it ready for testing, in the meantime I got a call saying my camera arrived at Customs so I should have it by this afternoon :)
  • 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: Insomniac » Thu Jan 21, 2010 6:22 am

jackssmirkingrevenge wrote:
Insomniac wrote:Any chance of a transparent barrel to better see what's going on? Perhaps you could cast one out of epoxy :lol:


It's not impossible, I have cast tubes before;) but I have enough on my plate making the breech block for this thing at the moment. Tomorrow I should have it ready for testing, in the meantime I got a call saying my camera arrived at Customs so I should have it by this afternoon :)


Sounds great! Mine arrived in the morning, right before school... so I had to sit through a full day of lessons before I finally got to try it, and then I had the long wait while the battery charged, which had the infuriating side-effect of it being too dark outside to film anything by the time I finally had it working :x
  • 0

I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
User avatar
Insomniac
Major General
Major General
 
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia
Country: Australia (au)
Reputation: 0

Unread postAuthor: JDP12 » Thu Jan 21, 2010 8:25 am

Sounds good JSR, can't wait to see the results!!
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jan 21, 2010 5:00 pm

Here's what the action looks like so far, if it looks a bunch of scrap loosely held together by copious amounts of binary adhesive, it's because it is :P

Hope to have it ready for single shot testing by the end of the weekend.
  • 0

Attachments
Image207.jpg
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: JDP12 » Thu Jan 21, 2010 5:28 pm

Yep!!! Thats exactly what it looks like. :D

But it looks good nonetheless!!
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
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 ©'