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 65 users online :: 4 registered, 0 hidden and 61 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Piston Valve Help

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Piston Valve Help

Unread postAuthor: idespisecats » Tue Oct 03, 2006 12:59 pm

I'm looking at building a large scale pneumatic cannon to launch t-shirts with, and am thinking a piston valve would be better because the barrell is going to be so large anyways. How would I mod one to launch right or what kind should I use? or would I just be better off using a sprinkler valve?
  • 0


idespisecats
Private
Private
 
Posts: 18
Joined: Tue Oct 03, 2006 12:37 pm
Location: Southern California
Reputation: 0

Unread postAuthor: Gnobbes » Tue Oct 03, 2006 2:31 pm

How big a barrel do you think you'll need to shoot a rolled up T-shirt??

I would think an unmodified sprinkler valve would be fine to launch t-shirts. You just need to lob them into stands, not blast people with them.

Where are you planning on using this thing.
And what are you gonna use to charge it. Compressors charge fast, but aren't very portable.
CO2 is more convienient, but you'd need to invest in a regulator, and use materials that could withstand very low temps. The sprinkler valve probably wouldn't be a great idea with CO2.
  • 0

User avatar
Gnobbes
Private
Private
 
Posts: 17
Joined: Tue Aug 22, 2006 3:54 pm
Reputation: 0

Re: Piston Valve Help

Unread postAuthor: MrCrowley » Tue Oct 03, 2006 4:14 pm

idespisecats wrote: How would I mod one to launch right or what kind should I use? or would I just be better off using a sprinkler valve?


what do you mean "how would you mod one"?you just build them,for this design you should go with an over-under barrel sealing as a co-ax youll need one huge chmaber b/c of the barrel bore and a over-under chamber sealing piston needs o-rings and is slightly harder then a barrel sealing.

if your just launching into stands go with a modded sprinkler valve if you want distance or destruction go with the BSP(barrel sealing piston) over-under design,3" barrel 3' long,2" tee for the piston then a 4" chamber 4' long.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: zeigs spud » Tue Oct 03, 2006 5:09 pm

quote from Gnobbes"How big a barrel do you think you'll need to shoot a rolled up T-shirt??"

really? lol...i'd just make a normal spud cannon if u want a piston then mkae a bit larger piston cannon (havn't ever really seen big ones, well normal size compared to and sprinkler valved canons)
  • 0

User avatar
zeigs spud
Colonel
Colonel
 
Posts: 657
Joined: Tue Apr 04, 2006 10:39 pm
Reputation: 0

Unread postAuthor: Velocity » Tue Oct 03, 2006 5:14 pm

Yeah, you don't want to blow holes in people...

I blew a hole in my desk with my piston-valved cannon at 20 PSI. I didn't even notice it until a few minutes after! You can see it in this <a href="http://s94.photobucket.com/albums/l112/rmich732/?action=view&current=retarded.flv">video</a>
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: MrCrowley » Tue Oct 03, 2006 5:42 pm

lol i saw that video yesterday didnt realise you broke the desk though
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: idespisecats » Tue Oct 03, 2006 6:39 pm

Thanks for the advice, 2 more quick things though, how big should I make the reservoir? and I keep hearing people talking about using epoxy as a sealant. What kind of epoxy is it and what do I use it on? I was going to just use regular blue pipe glue.
  • 0


idespisecats
Private
Private
 
Posts: 18
Joined: Tue Oct 03, 2006 12:37 pm
Location: Southern California
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: MrCrowley » Tue Oct 03, 2006 6:41 pm

1:i would say 4" pipe 3-4' long
2:use primer AND glue to join the pipe.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'