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 74 users online :: 5 registered, 0 hidden and 69 guests


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

Registered users: Bing [Bot], Exabot [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

Combustion venting valve

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

Combustion venting valve

Unread postAuthor: jonnyboy » Sat Jan 17, 2009 10:50 pm

As far as I know I'm the first to think of this, but if it isn't well what would you search for?

The idea is the piston is about 1/4 inch to small for the pipe and upon firing the piston seals against an o ring when the combustion is done the spring pushes the piston back to its "open state" since the piston is too small it allows for venting while not operating any valves.

I realize becuase of the spring the piston won't be able to seal on the o ring so the o ring should go on the end of the 3-1.5 inch reducer.

Why do this, couldn't you use a ball valve?
I'm designing a combustion gun that can be filled vented and fired from a distance. I've seen some cannons that use check valves and a mattress inflater but I plan to use this away from an outlet and I already need batteries for operating the propane metering valves.


If you have any questions, comments or constructive criticisms feel free to share.
  • 0

Attachments
scanned024.jpg
mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
User avatar
jonnyboy
Colonel
Colonel
 
Posts: 591
Joined: Mon May 26, 2008 1:20 pm
Location: Williamston MI USA
Reputation: 0

Unread postAuthor: STHORNE » Sat Jan 17, 2009 10:54 pm

looks alright.

you should think of making a prototype (smaller scale so you don't end up wasting too much good pvc if it doesn't work).

but yeah, nice idea. I have the strangest feeling i've seen something like this before but i can't quite put my finger on it.

ah well, what ever. good work!
  • 0

Forum Rules - follow them or else!
“Happiness is the meaning and the purpose of life, the whole aim and end of human existence”
User avatar
STHORNE
Donating Member
Donating Member
 
Posts: 1208
Joined: Wed Feb 14, 2007 7:50 pm
Location: Kewaunee, Wisconsin
Reputation: 0

Unread postAuthor: starman » Sat Jan 17, 2009 11:10 pm

Looks like the piston and spring are going to just flop around in there. Do you have a fan inside drawing air in? Also how do I close the vent before fueling? And it looks like you are depending on combustion to close the vent only briefly then open again in its unpredictable floppy state.

Maybe I'm missing something... :?
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: Gippeto » Sun Jan 18, 2009 1:22 am

Have you considered a reed valve?

Something like that used in a pulse jet.

http://www.airtoi.com/pulse.htm

A fan should be able to open it for venting, and it would close for fueling as soon as you shut the fan off.

A separate fan would be required for mixing.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: jonnyboy » Sun Jan 18, 2009 11:39 am

starman wrote:Looks like the piston and spring are going to just flop around in there. Do you have a fan inside drawing air in? Also how do I close the vent before fueling? And it looks like you are depending on combustion to close the vent only briefly then open again in its unpredictable floppy state.

Maybe I'm missing something... :?


There will probably be a two guide wires so the piston goes back evenly. When I build the prototype I'll try it with a loose piston and one with some equalization holes. There will be a fan in there as well I just drew a cannon around it so you guys see where it fits in.

@gippeto
Why would I need two fans? I could just reverse the current so it blows out and can suck in.
  • 0

mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
User avatar
jonnyboy
Colonel
Colonel
 
Posts: 591
Joined: Mon May 26, 2008 1:20 pm
Location: Williamston MI USA
Reputation: 0

Unread postAuthor: psycix » Mon Jan 19, 2009 6:55 am

Why would I need two fans? I could just reverse the current so it blows out and can suck in.

A PC fan will not work if you reverse the polarity.
Most burshless motors wont. And you need brushless motors to prevent sparking.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: maggotman » Mon Jan 19, 2009 6:36 pm

use the reed valve of a crosser
  • 0


maggotman
1st Lieutenant
1st Lieutenant
 
Posts: 262
Joined: Mon Dec 15, 2008 7:39 am
Reputation: 0

Sponsored

Sponsor
 


Return to General Spud Cannon Related

Who is online

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

Reputation System ©'