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 :: 5 registered, 0 hidden and 35 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

Chamber fan. Do I really need it for propane meter injection

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

Chamber fan. Do I really need it for propane meter injection

Unread postAuthor: Ziptietech » Tue Jan 15, 2013 8:51 pm

Well I finished my canon and I forgot to put in a chamber fan. Well I'm not able to take it apart now and I can't get in the chaner because I used a 3in to a 1 1/2 reducer to a ball valve.

I can't fire it until I go on vacation b
So I can't check of it works

Do I really need the fan?? Or will it work without it.
  • 0


Ziptietech
Private
Private
 
Posts: 3
Joined: Tue Jan 15, 2013 8:37 pm
Reputation: 0

Unread postAuthor: mark.f » Tue Jan 15, 2013 9:32 pm

It will work without it. However, power will be reduced a by a not-insignificant amount.

You've now learned the lesson it took forever for JSR to learn... make your projects serviceable. :p

Good luck with the project.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Ziptietech » Tue Jan 15, 2013 9:39 pm

Lol thanks that will calm my nerves a little lol.

Yea I didn't think about the fan when I was gluing it haha.

Thanks for the help
  • 0


Ziptietech
Private
Private
 
Posts: 3
Joined: Tue Jan 15, 2013 8:37 pm
Reputation: 0

Unread postAuthor: mark.f » Tue Jan 15, 2013 10:19 pm

You could throw some airsoft bb's or pennies into the chamber for fuel mixing. :roll: I've done it before with pennies on a small launcher I made.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Ziptietech » Tue Jan 15, 2013 10:33 pm

Well I made my canon have a tire valve for propane injection. And I was wondering if I can pumpe extra air in too to Mix the air. But if it isn't too much of a deal ill just shot it without a fan. If it doesn't work ill cut the camber off and put in a fan and add a coupler with a screw on cap in the rear
  • 0


Ziptietech
Private
Private
 
Posts: 3
Joined: Tue Jan 15, 2013 8:37 pm
Reputation: 0

Unread postAuthor: anarchy08 » Thu Jan 17, 2013 7:22 am

I had a propane cannon running 100mm X400 combustion chamber and can tell you the difference between operating a chamber fan with and without is HUGE! even from dry firing you could tell that you were getting a more complete mix- the death of that cannon actually came from the fuel air becoming too efficient and self destructing in operating. fired off a good 100 odd golf balls before it stress failed
  • 0


anarchy08
Specialist
Specialist
 
Posts: 52
Joined: Tue Aug 02, 2011 10:16 am
Reputation: 0

Unread postAuthor: ramses » Thu Jan 17, 2013 7:55 am

Ziptietech wrote:Well I made my canon have a tire valve for propane injection. And I was wondering if I can pumpe extra air in too to Mix the air. But if it isn't too much of a deal ill just shot it without a fan. If it doesn't work ill cut the camber off and put in a fan and add a coupler with a screw on cap in the rear


In either case, adding air will throw the fuel mixture off. If you let the air escape, you just need to aim high. If you don't allow the air to escape, you have built a hybrid, which will require a burst disk or some other valve (and probably shouldn't be made out of PVC)

They do sell some very small PC fans that could probably fit through the 1/2" ball valve, but making connections and securely mounting it would be a pain.
  • 0

POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
User avatar
ramses
Major General
Major General
 
Posts: 1679
Joined: Thu May 29, 2008 6:50 pm
Reputation: 3

Sponsored

Sponsor
 


Unread postAuthor: jimmy101 » Thu Jan 17, 2013 3:23 pm

A fan doesn't make that much difference IF the fuel is well mixed. The fan just helps to mix the fuel faster. If you are patient the gun'll work fine. After fueling wait a couple minutes before firing to give the fuel time to properly mix with the air in the chamber.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: Squerl101 » Thu Jan 24, 2013 12:19 am

Yeah, the fan is just there to increase efficiency of the fuel, so that it fills every cubic centimeter of your combustion chamber for maximum power. It will definitely work without it though, I don't have one, and I get a pretty powerful punch when I hit the igniter.
  • 0

User avatar
Squerl101
Private
Private
 
Posts: 15
Joined: Wed Jan 23, 2013 3:10 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jan 24, 2013 12:44 am

Image wrote:You've now learned the lesson it took forever for JSR to learn... make your projects serviceable. :p


I had missed this :D
  • 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

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'