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 55 users online :: 7 registered, 0 hidden and 48 guests


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

Registered users: Baldyforks, Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Hybrid Cartrige Design

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Hybrid Cartrige Design

Unread postAuthor: noob of noobs » Fri Jul 04, 2008 4:11 pm

For the past month or so, I’ve been thinking up a basic design for a hybrid cartridge, and have incubated the fallowing design. After researching in depth however, I found that it a lot like JSR’s design for combustion cartridges http://www.spudfiles.com/forums/combust ... 10402.html. Much to my dismay, they’re almost the same thing. But because there were some differences & I didn’t want to kick up an old topic, I started a new thread. So here it goes.


Overview of cartrige:
The body of the cartridge is a steel nipple or piece of copper pipe. At the back of the cartridge there is a check valve that doubles up as the sparker too (described later). At the front of the cartridge, there is a male adapter threaded onto a female adapter. In between them is a burst disk as shown here at advanced spuds: http://advancedspuds.com/burstdiskinst.htm. This will hold the fuel mixture inside the nipple or section of pipe like a regular burst disk. On the female adapter at the front end there will be a small piece of pipe that will hold the ammo, and will be pushed into a coupler connecting to the barrel.



The back end of the cartridge (the part with the check valve/sparker) is basically the check valve designed by gipetto on his stirrup pump http://www.spudfiles.com/forums/easy-st ... 13277.html. Because my writing is probably very confusing, feel free to refer to the diagram below.

Check Valve:
It’s a fitting that has a ridge (female adapter) that a washer is epoxied to on the inside thus making sure the washer doesn’t blow out of the adapter during ignition. There’s a bolt with a neoprene washer on one end backed with another metal washer. The neoprene face as well as its metal skeleton is inside the cartridge, and pushed against the washer epoxied to the adapter, thus forming a metal-neoprene-metal seal. On the end of the bolt protruding from the adapter, there is a spring that pushes the bolt outward, thus causing the cartridge to seal like a Schrader (which the back end of the cartridge is, basically.

Electrode
The bolt is coated with some insulating material (I’m thinking it’d be wrapped in electric tape). The bolt as well as the metal washer are to be very close to the metal structure of the rest of the cartridge, so that when an electrical current is applied to the bolt and the metal surface of the rest of the cartridge, a spark will form between the washer that gives the neoprene structure and somewhere else in the chamber. Again, refer to the pictures.

As far as I can tell, it seems like a pretty solid design. My only concerns are that:
A. The lip that holds the washer in place on the back end will not hold the washer (However, it held 400psi in Gipetto’s pump).
B. The washers will break under the pressure spike (again, it worked in Gipetto’s pump).
C. The spark won’t form for some reason (Would making the backing washer pointed help?)
D. The burst disk system won’t work because the threads will rip it up.
E. The thing will explode for some reason that I didn’t think of.
F. They’ll be too expensive to mass produce (I’m thinking in the quantities of a revolver or gatling gun).

So that’s it. Unfortunately, I probably won’t be able to test this any time soon or maybe at all, so don’t expect any prototypes from me in the near future. Therefore, feel free to try it out if you want to. Where I live I probably won’t be able to utilize this type of stuff anyway. :cry:
So what do you think? All comments, criticism, and ideas are welcomed.

Cheers,
Danny
  • 0

Attachments
Cartridge design.jpg
The overall design of the cartrige
Cartridge design.jpg (31.7 KiB) Viewed 563 times
Cartrige 1A check valve & sparker.jpg
Sparker/Check valve design
Last edited by noob of noobs on Sat Jul 05, 2008 1:33 pm, edited 1 time in total.
User avatar
noob of noobs
Captain
Captain
 
Posts: 320
Joined: Tue Jun 12, 2007 8:04 pm
Location: Illinois, Skokie
Reputation: 0

Unread postAuthor: SpudFarm » Sat Jul 05, 2008 1:08 pm

sorry to say it but if you split up your text abit i may feel to read it, now it is just confusing to look at.
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: noob of noobs » Sat Jul 05, 2008 1:34 pm

Alright, I just changed it. I probably wouldn't have read it either. :wink:
  • 0

User avatar
noob of noobs
Captain
Captain
 
Posts: 320
Joined: Tue Jun 12, 2007 8:04 pm
Location: Illinois, Skokie
Reputation: 0

Return to Hybrid Cannon Discussion

Who is online

Registered users: Baldyforks, Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'