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 80 users online :: 4 registered, 0 hidden and 76 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

Cheap Propane Metering Device

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Cheap Propane Metering Device

Unread postAuthor: kjjohn » Sun Jul 12, 2009 6:54 pm

I know that it can be fairly cheap already to buy a couple valves and copper pipe to make a metering device, but if you want a quicker load time, it's kind of slow to open and close two valves in a row.

I thought of a quick and easy way to make a metering device: with a bike pump. Bike pumps operate with two one-way valves, one to take air in, one to pump it out. Take apart a bike pump, modify it a little, and you could have a sort of "pump-action" type of loader. The same approximate amount of fuel would always enter the chamber, no matter how fast you pump it.
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: Pyro Ninja » Sun Jul 12, 2009 7:53 pm

Sounds a bit like the metering system used on the 'BL-520'

http://ultimatespudgun.com/product_info.php?cPath=42&products_id=178
  • 0

User avatar
Pyro Ninja
Major
Major
 
Posts: 351
Joined: Mon Oct 09, 2006 7:11 am
Location: Australia
Reputation: 0

Unread postAuthor: kjjohn » Sun Jul 12, 2009 7:58 pm

Pyro Ninja wrote:Sounds a bit like the metering system used on the 'BL-520'


Yeah, that's kind of where I got the idea. I am intending to use it for a hydrogen powered .25cal gun - pump-action. Pumping it will also load the bullet (it will be attached to a breach loader below an ammo hopper)
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: Technician1002 » Sun Jul 12, 2009 8:12 pm

If you want to build one like that one the generic design is here.
http://www.spudfiles.com/forums/bl-520-fuel-metering-device-t18146.html
Shureshot even posted one of their drawings for it.
  • 0

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

Unread postAuthor: kjjohn » Sun Jul 12, 2009 8:20 pm

well that's certainly simpler. Just how do I make one?

Also, a pump might be better because the stored fuel in my gun (hydrogen) may not be under pressure, as it will be coming directly from the electrolysis unit.
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: inonickname » Sun Jul 12, 2009 10:39 pm

I hope you have a bloody massive electrolysis unit, otherwise there's no way in hell that having an ultra fast metering system will help. If you require hydrogen, why not use a reaction between sodium hydroxide and high surface area aluminum? Then oxygen can be obtained through the decomposition of a chlorate if required.

The Bl-520 used a balanced spool valve. It's extremely simple, and you really shouldn't need spoonfeeding for it.

Image
What about the tippman C3?
  • 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: kjjohn » Sun Jul 12, 2009 11:26 pm

Well that's awesome, but a bit too complicated for me! (the C3, that is) :) Come to think of it, I probably could use the spool valve. It would probably help quite a bit if the hydrogen was produce outside of the gun, then it could be stored pressurized in the gun, allowing use of the spool valve as well
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jimmy101 » Mon Jul 13, 2009 11:31 am

A syringe would be cheaper than trashing a bike pump.
A syringe will work with hydrogen from a resevoir.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: kjjohn » Mon Jul 13, 2009 1:01 pm

I considered a syringe, but the metering device needs to be in a fixed position - I want it to work like a pump action, without having to move the syringe out of the hydrogen to inject into the chamber.
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: jimmy101 » Mon Jul 13, 2009 1:58 pm

kjjohn wrote:I considered a syringe, but the metering device needs to be in a fixed position - I want it to work like a pump action, without having to move the syringe out of the hydrogen to inject into the chamber.

Then put in a three way valve.

In general, any two valve meter system can be made with a single three way valve.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: kjjohn » Mon Jul 13, 2009 3:02 pm

yes, a three-way would work
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: Willdebeers » Mon Jul 13, 2009 3:05 pm

kjjohn wrote:yes, a three-way would work


Thats what she said!
  • 0

Image
User avatar
Willdebeers
2nd Lieutenant
2nd Lieutenant
 
Posts: 214
Joined: Tue Feb 03, 2009 1:18 pm
Reputation: 0

Unread postAuthor: kjjohn » Mon Jul 13, 2009 3:07 pm

Willdebeers wrote:
kjjohn wrote:yes, a three-way would work


Thats what she said!


:lol: :lol: :lol:

lol
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: Willdebeers » Mon Jul 13, 2009 3:21 pm

Anyway...this has been done before. Check out the BL-520 metering device.
  • 0

Image
User avatar
Willdebeers
2nd Lieutenant
2nd Lieutenant
 
Posts: 214
Joined: Tue Feb 03, 2009 1:18 pm
Reputation: 0

Unread postAuthor: kjjohn » Mon Jul 13, 2009 4:52 pm

bl-520 was a spool valve
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Next

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'