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 43 users online :: 4 registered, 0 hidden and 39 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 Efficiency Questions- Thanks

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 

1.5" vs. 1.25" U Bend Efficieny

1.5"
1
100%
1.25"
0
No votes
 
Total votes : 1
  • Author
    Message

Flow Efficiency Questions- Thanks

Unread postAuthor: BrianMigs » Tue Mar 18, 2008 3:34 pm

Ever since I had built my first pneumatic, my friend Alex has been begging for me to make him one. Since I started on a new piston project, I gave in and decided I would make one for him.

The design will be identical to mine in that it is an over-under design with a modded 1" sprinkler valve

However, my question for all the spudders is will using 1.5" piping and elbows for the U bend, be more efficient than the 1.25" pipe and elbows I used for my first pneumatic?

If so, I might just sell him my old one, and use that money to finish up the new one! Hehehe, kinda mean I know. Thank You! :-)
  • 0


BrianMigs
Specialist
Specialist
 
Posts: 42
Joined: Sat Jan 26, 2008 1:23 pm
Reputation: 0

Unread postAuthor: Pilgrimman » Tue Mar 18, 2008 5:00 pm

Assuming your valve is after the U-bend, I would personally choose 1.25" pipe due to the fact that the valve can only allow a certain flow, and both pipe sizes exceed that flow. Additionally, the 1.25" pipe has less surface area and slightly less length in the bend for air to lose energy due to friction, as well as energy due to change in direction of flow. Finally, unless your barrel is very long, you will likely make your gun more efficient by using smaller pipe, and thus improving your chamber to barrel ratio.
  • 0

Yeah, we wouldn't want to anger the bees, now would we??

I HATE YOU BEES! I HATE YOU BEES! I HATE YOU BEES!

LMAO Classic!!!! I love Family Guy!
User avatar
Pilgrimman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 481
Joined: Thu Jun 28, 2007 1:10 pm
Location: Grants Pass, OR
Reputation: 0

Unread postAuthor: pizlo » Tue Mar 18, 2008 8:27 pm

A chamber larger than the C:B ratio CANNOT decrease the power.
  • 0

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

Unread postAuthor: Hubb » Tue Mar 18, 2008 8:45 pm

I, honestly, don't think it will matter. I do not believe you will notice a difference either way.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: Daegurth » Wed Mar 19, 2008 7:41 am

i'd sell him your old one anyway, and use what you learnt in the construction of that to build a better one second time around. it'll teach him to get other people to do his work for him rather than putting a bit of effort into learning how to do it himself.

either pipe diameter will work equally, it makes very little- if any- difference since it's wider than the narrowest point in the chain (the valve)
  • 0

User avatar
Daegurth
Private
Private
 
Posts: 15
Joined: Sun Mar 16, 2008 8:57 am
Location: england
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'