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 51 users online :: 3 registered, 0 hidden and 48 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

hybrid cartridge protoype without burst disk

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

Unread postAuthor: jackssmirkingrevenge » Thu Aug 19, 2010 2:00 pm

What I had in mind in terms of action was basically identical in principle to what I was doing with my combustion cartridges.
  • 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 » Thu Aug 19, 2010 4:05 pm

Awesome!!! JSR that super cool. Did they seem to be pretty consistent as to releasing the BB-- not too much variance in the silicone?

That's super cool good job
  • 0

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

Unread postAuthor: dewey-1 » Thu Aug 19, 2010 4:06 pm

JSR;
Great to see that you are making some progress on your cartridge endeavor!

Looks impressive as is. Can only get better! :D
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: Ragnarok » Thu Aug 19, 2010 5:05 pm

jackssmirkingrevenge wrote:Well, finally, SUCCESS!!!!

Pah. I'm disappointed. This should clearly read "Huge Success". :roll:

But good work anyway.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: jackssmirkingrevenge » Thu Aug 19, 2010 10:43 pm

Cheers guys, though it will be a "huge" success when I can have it fire and cycle a semi-auto action ;P

Did they seem to be pretty consistent as to releasing the BB-- not too much variance in the silicone?


If I pressurise the cartridge until it pops, it holds the BB until about 150 psi very consistently. The important thing is to always push the BB to the same depth into the seal.

Here's a couple of pics of the "magnum" version for a 3/8" bearing, I'll test it some time this evening when it's fully cured. The one thing I'm not sure of is the seal pop-off pressure. Note how the schrader is recessed in the cartridge body in order to afford some measure of protection if it hits the ground tail first.
  • 0

Attachments
magcart1.JPG
magcart2.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: Ragnarok » Fri Aug 20, 2010 4:32 am

jackssmirkingrevenge wrote:Cheers guys, though it will be a "huge" success when I can have it fire and cycle a semi-auto action

No, that will be a triumph. :tongue3:
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: CpTn_lAw » Fri Aug 20, 2010 5:10 am

Super happy you finally had a nice motivator boom !! This will most definately be a major step-up in the spudgun achievment list!
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: POLAND_SPUD » Fri Aug 20, 2010 5:53 am

Ragnarok wrote:
jackssmirkingrevenge wrote:Cheers guys, though it will be a "huge" success when I can have it fire and cycle a semi-auto action

No, that will be a triumph. :tongue3:

nope... that will be an EPIC WIN!!

@jsr
I am quite sure you get acheive this goal. You know what I think about cartridges right ?? :wink: somethign tells me that larda will soon show you that you don't need cartridges to build a semiauto hybrid :wink:

yeah, I know I know... you want ejecting cartridges
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: jackssmirkingrevenge » Fri Aug 20, 2010 2:32 pm

CpTn_lAw wrote:Super happy you finally had a nice motivator boom !!


You can take some credit as well for your own hybrid and ignition tips, without which I would not have revisited this project ;)

yeah, I know I know... you want ejecting cartridges


At least you understand :)

Well, I tried it out, the seal will retain pressure without popping out up to 45 psi, so I'm limited to a 4x mix - which worked (BLAM! even without a barrel the BB left a 3mm deep dent in my wooden wardrobe :roll:)

I'm going to reglue it with araldite and see if I can increase the pop-off value.
  • 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: CpTn_lAw » Sat Aug 21, 2010 2:35 pm

jackssmirkingrevenge wrote:
CpTn_lAw wrote:Super happy you finally had a nice motivator boom !!


You can take some credit as well for your own hybrid and ignition tips, without which I would not have revisited this project ;)



I will most certainly follow your steps when i come back (currently at my dad's) and try to see what's doable with a standard piezo and some polyethylene tubing!

The credit here is all yours, and my hybrid is far from competing with most of 'em showed here!
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: spudamine » Sun Aug 22, 2010 1:30 am

I'm really interested to see how well scaling it up goes and how high a pressure the seal will hold to, the small one looked brilliant.
Do you have any feeling for whether the gases will seperate in the cartridge over time, I know this was brought up before but nobody managed to make a working one to test it, personally I recckon it won't be a problem.
  • 0

User avatar
spudamine
Sergeant Major
Sergeant Major
 
Posts: 184
Joined: Sun Nov 23, 2008 2:47 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Aug 22, 2010 4:23 am

CpTn_lAw wrote:The credit here is all yours, and my hybrid is far from competing with most of 'em showed here!


Of course there are more advanced hybrids on the forum, but it was this shotthat really hammered it home that there is something in this hybrid malarkey for me :D

Do you have any feeling for whether the gases will seperate in the cartridge over time, I know this was brought up before but nobody managed to make a working one to test it, personally I reckon it won't be a problem.


We had discussed it here, if anything the mix should be even more homogenous the longer it's left.

I'm a bit stumped with finding a good seal for the cartridge, in the meantime I'm making a "traditional" hybrid with a burst disk - still a mini, but I always wanted to make a powerful 0.22" pistol, the problem with a pneumatic is that it would be too loud even with an oversized suppressor, but I figure it's easier to muffle the noise of a hybrid because you can kill pressure not just by expansion but by cooling the propellant gasses
  • 0

Attachments
CIMG0415.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: CpTn_lAw » Sun Aug 22, 2010 5:52 am

Hehehe it is planned too to make a small caliber hybrid pistol!
I'll try to be as inventive as you ;)

Suppressing a hybrid works much better than upressing a pneumatic, however unsupressed, the hybrid wil be much much more loud thn the pneumatic !
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Aug 22, 2010 6:07 am

Looking forward to seeing your results :D I'll do some performance evaluation first - spark gap is *really* tiny, I can just put a sheet of paper between the electrodes, so I'm hoping to take it to at least 8x. For the suppressor I have some nice heat-absorbing copper tube in mind, with plenty or steel wool packed in, should do the trick. The plan is to end up with something like the Welrod.

As to the cartridge, I decided screw the large calibre and let's go with 0.177" - it looks pretty silly now, something along the lines of the 7.92x94 anti tank cartridge fired by the Panzerbüchse 39, but it should give plenty of velocity. Once I get to the point of getting reliable function, I'll make a barrel and breech for it then hopefully move to a direct blowback action.
  • 0

Last edited by jackssmirkingrevenge on Thu Sep 16, 2010 7:17 am, edited 1 time in total.
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 » Sun Aug 22, 2010 7:24 am

Looks awesome, I'm a fan of the Welrod myself.
  • 0

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

PreviousNext

Return to Hybrid Cannon Discussion

Who is online

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

Reputation System ©'