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 60 users online :: 4 registered, 0 hidden and 56 guests


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

Registered users: Bing [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

Rattlesnake V3 - HPA auto valve

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Rattlesnake V3 - HPA auto valve

Unread postAuthor: jackssmirkingrevenge » Sun Apr 19, 2009 7:21 am

Presenting the third major version of my constant flow automatic valves, following on from V1 and V2. Here's how it compares with the rest of them:

Image

edit: check out the internal diagram and construction details.

Basically the same design, but made in a stainless steel body as it's designed for the 500-800 psi range. Anyway, some videos (all at reg set to 500 psi) :D

2000 psi fill, fired in bursts:

[youtube]http://www.youtube.com/watch?v=oiEoZ1VPSzc[/youtube]

2000 psi fill tank dump:

[youtube]http://www.youtube.com/watch?v=R3vs2pa3yoQ[/youtube]

2000 psi fill tank dump with more spring shims fitted to increase compression:

[youtube]http://www.youtube.com/watch?v=PKFt1cmk4l4[/youtube]

Doesn't really come accross in the videos but it's really loud! I tried it with the pellet magazine and total fail, it fired a couple of shots before jamming completely because the heads of pellets in the mag were jamming into the tails of the preceeding pellet and expanding :roll: so here's a damage vid with 6mm 0.25g BBs instead:

[youtube]http://www.youtube.com/watch?v=usJ56Z_EwFM[/youtube]

Just a quick ten round burst, double feeds galore, but look what it did to that 1/8" thick acrylic (with the BBs being totally pulverised against the hard surface behind it):
  • 0

Attachments
exit holes.JPG
entry holes.JPG
Last edited by jackssmirkingrevenge on Sun Apr 19, 2009 9:36 am, edited 2 times 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: psycix » Sun Apr 19, 2009 7:41 am

Ah finally!
Any pic of the internals?

Are you going to solve the pellet problem?
  • 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

Unread postAuthor: Ragnarok » Sun Apr 19, 2009 8:01 am

Well, that tank doesn't last very long, does it?

But nonetheless, very impressive. Good work.
  • 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: inonickname » Sun Apr 19, 2009 8:06 am

Man..this is getting more tempting for my overbored PCP project.. I'll post in a min or two.

Yet more good work, sounds insanely loud. The pop-off route seems much more efficient than the blowback route or anything that uses pressure to expand and push something pre-firing.

How long is the barrel btw?
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: ALIHISGREAT » Sun Apr 19, 2009 8:33 am

nice, all you need to do now is hook up a propa trigger.
  • 0

<a href="http://www.bungie.net/stats/halo3/default.aspx?player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
Image
User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: POLAND_SPUD » Sun Apr 19, 2009 8:41 am

yep... the tank doesn't last very long... do you plan to get a bigger one or do something to increase numbr of shots per fill ? I supposoe that there is some way to optimize the valve to use less air
  • 0

Last edited by POLAND_SPUD on Sun Apr 19, 2009 10:05 am, edited 1 time in total.
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 » Sun Apr 19, 2009 9:29 am

psycix wrote:Are you going to solve the pellet problem?


No, the idea is to have the final launcher firing 4.5mm BBs, feeding from a spring laoded tube magazine into a tee breech.

Well, that tank doesn't last very long, does it?


True, though consider it's only filled to 2000 psi (SCUBA tank needs a refill...) when it can take 3000 psi normally, so in practical terms it will last longer. Still, if I'm making this for BBs then the full 6mm porting is very much overkill, I can live with 3mm porting - so I think the next step is to make yet another version with generally smaller dimensions in terms of outlet, piston seat, piston diameter and chamber volume. This should use a lot less air per shot.

The pop-off route seems much more efficient than the blowback route or anything that uses pressure to expand and push something pre-firing.


What I like the most is that no air whatsoever is wasted elsewhere, it all goes out of the barrel.

All you need to do now is hook up a proper trigger


I have some small ball valves on order ;) I also need to make a proper magazine setup but that shouldn't be too hard.

Any pic of the internals?


Exactly the same design as all the other valves, but I've included a detailed diagram of what I used to make it exactly, and included the three epoxy "stages", how the construction was set up and sealed prior to the epoxt being poured.
  • 0

Attachments
rattlesnakev3details.GIF
rattlesnakev3details.GIF (20.74 KiB) Viewed 7601 times
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

Sponsored

Sponsor
 


Unread postAuthor: pizlo » Sun Apr 19, 2009 9:31 am

Aye, it seems you run that 2000 PSI dry in a mater of seconds. Personally I would want less power over more firing time.
  • 0

User avatar
pizlo
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Dec 22, 2006 7:27 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Apr 19, 2009 9:33 am

pizlo wrote:Personally I would want less power over more firing time.


I would rather have that too, and I'm not keen on getting a larger bottle because I want a compact PDW type launcher, so as described above I'll probably make another valve with smaller porting.
  • 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: ALIHISGREAT » Sun Apr 19, 2009 10:30 am

jackssmirkingrevenge wrote:
pizlo wrote:Personally I would want less power over more firing time.


I would rather have that too, and I'm not keen on getting a larger bottle because I want a compact PDW type launcher, so as described above I'll probably make another valve with smaller porting.


you should just hook it direct to your scuba tank and have the tank your back :D

p.s. you corrected the spelling when you quoted me you pedant!
  • 0

<a href="http://www.bungie.net/stats/halo3/default.aspx?player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
Image
User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: Carlman » Sun Apr 19, 2009 10:44 am

ALIHISGREAT wrote:p.s. you corrected the spelling when you quoted me you pedant!


he does that alot

nice work mate she looks sweet!
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: Brian the brain » Sun Apr 19, 2009 12:22 pm

Still it's got laser sounds...
Would a smaller chamber change your airconsumption...well, not yours, but the valve's...

??


Might just up the ROF again...

Jack, I love your little...thing.... :roll:
:shock: :D
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: VH_man » Sun Apr 19, 2009 12:39 pm

JSR, Just for an idea, Why not split the whole valve up into two or three parts?

For example, the "VALVE" part, and then the Chamber part, and then the fill area, and then be able to experiment with chamber volumes without having to re-build a new valve.

Once again, Truly Awesome.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: POLAND_SPUD » Sun Apr 19, 2009 1:26 pm

though I like some aspects of his constructions I must admit that they lack any servicability or modability

Jack, I love your little...thing....
small is beautiful... but bigger can do more :P
  • 0

Last edited by POLAND_SPUD on Sun Apr 19, 2009 5:08 pm, edited 2 times in total.
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 » Sun Apr 19, 2009 4:07 pm

you should just hook it direct to your scuba tank and have the tank your back :D


Not going to happen :P

p.s. you corrected the spelling when you quoted me you pedant!


... and I'm not even English. It's a sad day when a foreigner has to correct your native language :P :wink:

Would a smaller chamber change your airconsumption...well, not yours, but the valve's... Might just up the ROF again...


It might change a little but mostly I think that it's smaller porting that will make the difference. After all the chamber doesn't empty after each shot, just lowers in pressure.

Jack, I love your little...thing...


If you rub it hard enough it turns into a golfball auto :D

Just for an idea, Why not split the whole valve up into two or three parts?


Interesting point

Though I like some aspects of his constructions I must admit that they lack any servicability or modability


While that may be true of some of my prototypes, in this case, the piston can be serviced or replaced, same with the spring, so the crucial parts that one would expect to wear or need adjustment can be gotten to without tearing the whole thing apart.
  • 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

Next

Return to BB/Airsoft/Pellet Gun Database

Who is online

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

Reputation System ©'