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 40 users online :: 3 registered, 0 hidden and 37 guests


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

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

full-auto cannon?

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

full-auto cannon?

Unread postAuthor: donuthole » Thu Oct 27, 2005 8:44 pm

would it be possible to make an automatic potato gun? i think you could if you had a gravity fed magazine, and pre-cut potatoes. then make it be a blow-back or spring action, all the while filling the combustion chamber with propane at a high rate, and making it exaust the fumes. would this work or is it nearly impossible or impossible. i dont know, i am just throwing out ideas.


thank you,
donuthole
  • 0


donuthole
Private
Private
 
Posts: 1
Joined: Thu Oct 27, 2005 8:28 pm
Reputation: 0

Unread postAuthor: drac » Thu Oct 27, 2005 9:16 pm

Nearly impossible. Remember that automatic is anything that fires for as long as the trigger is held down. So technically, with proper circuitry, valves, fuel, venting components, but it would be SOOOOO expensive, and a b*tch to operate.

The closest we have to full automatic are the bb guns.
  • 0

User avatar
drac
Moderator
Moderator
 
Posts: 916
Joined: Sun Apr 24, 2005 8:56 am
Location: North Collins, NY
Country: United States (us)
Reputation: 2

Unread postAuthor: boilingleadbath » Fri Oct 28, 2005 6:14 am

A combustion has a complicated enough workings that it'd be really hard to get it to be opperated on the gas alone. I'd reccomend a recoil-opperated design.
Maybe you could make a cartrige-based system. The number of shots you'll be getting will be limmeted, but it could be good otherwise.

Another issue you'll have is it getting hot. Simple, if slightly costly (and heavy) solution: metal.

The idea is starting to come together. I'll get back to you in about 9 hours.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Unread postAuthor: crazyhorse » Fri Oct 28, 2005 12:48 pm

This propane noise maker can be regulated to fire between every 30 - 60 seconds.

I want to build something like this myself to ward off deer.

It looks like this might be the answer to your problem as well.
  • 0


crazyhorse
Private
Private
 
Posts: 7
Joined: Fri Oct 28, 2005 12:29 pm
Reputation: 0

Unread postAuthor: boilingleadbath » Fri Oct 28, 2005 3:20 pm

Well, I said I'd get back to you in 9 hours, looks like it could be 9.5. It took longer to make the diagram than I thought it would. Anyway...

<img src="http://img.photobucket.com/albums/v611/car2/ROFASGM.png" alt="Image hosted by Photobucket.com">
(not to scale, and probibly not the best way to do things.)

Basicaly, when you fire:
The chamber is launched backwards. (recoil)
The chamber moving backwards uncovers the breach-loading hole in the barrel, and the ammo (being stored in a spring-loaded clip) is pushed in. At the same time, the piston on the "Venter" is pushed backwards, sucking in fresh air.
The chamber continues backwards, and seals on the venter.
The movment of the piston activates the release mechanism (look closely to find out how it works). At roughly the same time, the propane injector is activated.
With the piston released, it pushes clean air into the chamber, taking the propane along with it. The old air is expelled through some holes behind the breach-loading point.
The chamber is pulled back into position with a spring (not shown). When in position, it depresses a momentary that is wired in series with the trigger.

I'm expecting a cyclic rate of 1-2 rounds/sec, based on some breif calculations. This is mostly related to the mass of the chamber.

It works a bit like a 2-cycle engein... and shares some of it's problems; mainly that you arn't burning compleatly fresh air each time. This will yeild lower and somewhat inconsistent muzzle velocities.

Another idea: a recycled chamber revolver.
You have a few chambers. One of these is at the top, in ready to fire position. The rest of them are below, being vented by a few fans aranged in a semi-circle (or, each has a seperate, internal fan) , or being filled with propane. It works a bit like a cartrige fed, but the cartriges are constantly being reloaded.
A recoil-operated indexer is used to bring the next cartrige into position.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Unread postAuthor: saladtossser » Fri Oct 28, 2005 5:50 pm

  • 0

"whoa... I thought pimpmann was black..."-pyromanic13
User avatar
saladtossser
Brigadier General
Brigadier General
 
Posts: 1234
Joined: Sat Mar 26, 2005 10:40 am
Location: Toronto
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'