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 63 users online :: 5 registered, 0 hidden and 58 guests


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

Registered users: Bing [Bot], Google [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

Simple over/under tennis ball launcher

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

Unread postAuthor: saefroch » Sun Jul 17, 2011 11:16 am

Your valve has an incredibly low flow coefficent... are you sure that's correct? It may be, but I've little experience with sprinkler valves indeed. The inner diameter should be zero unless this is a coaxial, and the outer diameter should be the inner diameter of the pipe, that is to say the outer diameter of the space inside the pipe.

Even with these changes, I am still getting higher muzzle velocities with a larger dead space.
  • 0

User avatar
saefroch
Major General
Major General
 
Posts: 1679
Joined: Mon Jun 08, 2009 8:47 am
Location: U.S.A.- See Map
Country: United States (us)
Reputation: 0

Unread postAuthor: tony48 » Tue Jul 19, 2011 4:18 pm

If you're still looking for 2.5" fittings, try to look up a Local plumbing supply place. If you can't find them there then order from flexpvc.com. They have great prices and a massive selection. If you manage to need something they don't have (i did) then email them and they will probably have it. You can also order 2.5" thinwall pipe and shipping is very well priced. I love this site.
  • 0

If life gives you lemons, put them in your cannon and shoot them back at life!
User avatar
tony48
Sergeant
Sergeant
 
Posts: 80
Joined: Sun Apr 06, 2008 6:46 pm
Reputation: 0

Unread postAuthor: Technician1002 » Tue Jul 19, 2011 6:47 pm

A source for fittings is a good electrical supply place. Sched 40 non metallic conduit (PVC) has the same dimensions as the water pipe cousin. Non Metallic electrical conduit is grey instead of white.
Image
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: yman » Wed Jul 20, 2011 9:55 am

tony48 wrote:If you're still looking for 2.5" fittings, try to look up a Local plumbing supply place. If you can't find them there then order from flexpvc.com. They have great prices and a massive selection. If you manage to need something they don't have (i did) then email them and they will probably have it. You can also order 2.5" thinwall pipe and shipping is very well priced. I love this site.


Thanks for he info - I came across them while searching online, although I ended up ordering from someone else (their site was a little difficult to navigate). Anyway - will keep them in mind in the future!
  • 0


yman
Private
Private
 
Posts: 10
Joined: Wed Jul 13, 2011 11:03 am
Reputation: 0

Unread postAuthor: yman » Wed Jul 20, 2011 9:56 am

Technician1002 wrote:A source for fittings is a good electrical supply place. Sched 40 non metallic conduit (PVC) has the same dimensions as the water pipe cousin. Non Metallic electrical conduit is grey instead of white.
Image


Didn't realize that - good to know! Being Sced 40, I assume it is also pressure rated like the water pipe?
  • 0


yman
Private
Private
 
Posts: 10
Joined: Wed Jul 13, 2011 11:03 am
Reputation: 0

Previous

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'