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 68 users online :: 4 registered, 0 hidden and 64 guests


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

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

Flow restriction

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Flow restriction

Unread postAuthor: jsefcik » Fri Aug 19, 2011 3:41 pm

I would like to shoot tennis balls out of my air cannon,
But I have one problem which is, I have a female 1 1/2 adapter if i go up to 2 1/2 for my tennis ball barrel.I know it will work, but im worried about the flow restriction with it?

Please help I would like to make a move on this
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Aug 19, 2011 4:05 pm

Naturally the flow restriction will limit performance, but on the other hand there's more area for the air to push on.

Short of actually making it, GGDT is your best bet to have a good idea of what performance might be like.
  • 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: jsefcik » Fri Aug 19, 2011 4:10 pm

I could never get it to work, Would you mind doing it for me and posting it on here for me?

so from your expeirence, would you do it?

also, any idea what size pipe would fit a regualr soda can?
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Aug 19, 2011 4:24 pm

Impossible to calculate without knowing all the data for your launcher, as well as any real world performance data with the 1.5" barrel I'm assuming it has currently fitted.

Here's some educated guesswork, as you can see you lose quite a bit of power with a tennis ball because it's got such a poor density, but for firing heavier projectiles (like a full soda can which should fit exactly in a tennis ball barrel) muzzle energy goes up considerably.
  • 0

Attachments
ggdtmodel.PNG
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: jsefcik » Fri Aug 19, 2011 4:59 pm

ok, data you mean, the size of my chamber and barrel and what not?

I have a 4 inch sch40 14 inch but add lil bit more with fittings so say 15 which is reduced down to 2inch down to 1 1/2 down to 1 inch with a female adapter then goes into my sprinkler valve , then on the opposite side of my valve i have 1 inch sch40 connected to a 1 1/2 female adapter which screw into my barrel with a male adapter which is 36 inches, I made that little connector so i can have many different barrels,

this is my gun, except a few changes, hose is gone,
http://imageshack.us/photo/my-images/854/dscf8174.jpg/
you can see the little unscrew able thing i made on the end of my barrel

Hopefully this helps jsr!!!!
hopefully once i get my piston valve i ordered, i can put soda cans really far!!!!
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Aug 19, 2011 5:05 pm

Roughly the data I worked with so the above results stand as a rough guide.

jsefcik wrote:i can put soda cans really far!!!!


GGDT says around 400 feet, but it doesn't know that they'll be tumbling end over end...
  • 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: jsefcik » Fri Aug 19, 2011 5:10 pm

I imagine that will do some damage,if full!!! :D :shock: :wav:

if cans will go 400 feet, what about the balls?

But would my piston put them even further?
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: mattyzip77 » Fri Aug 19, 2011 5:56 pm

I can put a 1 /12 inch tennis ball 250 yards with ease. Yes the piston valve will put them further, probably twice as far, and I think the cans would definatly need to be full, after all, how much fun would it be to shoot a empty can!! Try shooting a door :knob: , probably good ammo!! :D
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: jsefcik » Fri Aug 19, 2011 6:00 pm

mattyzip77 wrote:I can put a 1 /12 inch tennis ball 250 yards with ease. Yes the piston valve will put them further, probably twice as far, and I think the cans would definatly need to be full, after all, how much fun would it be to shoot a empty can!! Try shooting a door :knob: , probably good ammo!! :D


that a 1 1/2 tennis ball though,

and shooting a soda can is going to have some nasty recoil!!!
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: Technician1002 » Fri Aug 19, 2011 6:23 pm

Recoil with full pop cans isn't too bad if the launcher has reasonable flow restriction. With a larger valve with low restriction the recoil is impressive, but not as impressive as the impact. This can met a tree after a 20 foot flight.
Image

For the range you may get with tennis balls and your flow restriction, this should be in the ballpark depending on your choice of valve and chamber size.
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: jsefcik » Fri Aug 19, 2011 7:02 pm

so should i invest in the parts for it?

I think i might save the money for parts for my piston valve gun im going to build as soon as i get it in the mail
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Aug 19, 2011 11:30 pm

jsefcik wrote:so should i invest in the parts for it?


If you make a tennis ball barrel for it now, you'll get good performance.

If you wait for your piston valve, you'll get better performance.

Simple as that.
  • 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: jsefcik » Sat Aug 20, 2011 1:18 am

I think ill wait, money would be better used in my piston cannon
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'