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 63 users online :: 5 registered, 0 hidden and 58 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

My new propane cumbustion luncher

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

My new propane cumbustion luncher

Unread postAuthor: David603 » Mon Apr 26, 2010 9:08 pm

I Just wanted to know what you thought about it... here it is

The BBQ Igniter
Image

The Computer Fan
Image

Image

The propane torch i bought
Image

The end result after grinding, cutting and tapping
Image

The propane meter fully assembly
Image

The final result
Image

Image

The battery socket
Image

And here is a litte shooting video (sorry i speak French Canadian and there was a lot of crickets in the ditch...)

http://www.youtube.com/watch?v=wdNSK9QNLS0
  • 0

User avatar
David603
Private
Private
 
Posts: 9
Joined: Mon Apr 26, 2010 8:44 pm
Reputation: 0

Unread postAuthor: SpudBlaster15 » Mon Apr 26, 2010 9:41 pm

Looks pretty good. I like the design of the propane meter, but what's your reasoning behind using 2 regulators?

The placement of your igniter and fan electrodes is somewhat unsafe. You want to drill all mounting holes in an area where the chamber pipe and a fitting overlap, such that threaded fittings and screws can pass through a double layer of material.

You should also avoid mounting a BBQ igniter directly into the chamber, as shown in your pictures. It presents a large surface area for combustion pressure to act on, and if it is ejected during firing, it could severely injure your finger. Instead, use machine screws to pass the current through the chamber wall and form your spark gap.

Other than that, it appears to be a fine build. Nice to see some more Canadian spudders around here.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: David603 » Mon Apr 26, 2010 10:04 pm

Well the reason of the two regulators are simply that i was able to get two for free. I also thought that if i had a pressure to high between the two ball valves i could just unscrew the second one and exhaust some of the propane without having to change the pressure on the first one... but the main reason was that i had two of these. And the igniter being directly mounted directly on the gun was because i didn't wanted to have it taped anywhere on the gun and i liked the idea of shoulder launch :roll: and i put so much polyurethane on it that it covers quite a large surface and it's rock solid. I also put some washers coated with rubber to prevent the two fan screws to get out but the idea of dilling where the pipe and the fitting overlaps would have been a safer solution, i agree.
  • 0

User avatar
David603
Private
Private
 
Posts: 9
Joined: Mon Apr 26, 2010 8:44 pm
Reputation: 0

Unread postAuthor: deathbyDWV » Mon Apr 26, 2010 10:14 pm

Yep, looks like a good build. Clean too.

The only thing I see wrong is the non pressure rated bell reducer. Considering you have that I would guess there's more non pressure rated pipe/fittings... Not much to worry about on a combustion, bu I wouldn't want to hold that by my head...
  • 0

Life's too short to mark off the items on your wish list...
User avatar
deathbyDWV
Colonel
Colonel
 
Posts: 576
Joined: Sat May 16, 2009 4:02 pm
Location: Owasso, OK
Reputation: 2

Unread postAuthor: SpudBlaster15 » Mon Apr 26, 2010 10:33 pm

deathbyDWV wrote:The only thing I see wrong is the non pressure rated bell reducer. Considering you have that I would guess there's more non pressure rated pipe/fittings... Not much to worry about on a combustion, bu I wouldn't want to hold that by my head...


The cannon is made from ABS pipe and fittings, so even though the parts are not rated for pressure, I'd still consider them safer than PVC (Both rated and DWV) for this application.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: iknowmy3tables » Mon Apr 26, 2010 11:02 pm

standard abs is typically cell core so it's not that safe, but it is a combustion cannon so it's should be okay
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: David603 » Mon Apr 26, 2010 11:19 pm

Well the only reason i used ABS is that it is more elastic than PVC. If it breaks i want it to crack open and not explode
  • 0

User avatar
David603
Private
Private
 
Posts: 9
Joined: Mon Apr 26, 2010 8:44 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Technician1002 » Mon Apr 26, 2010 11:19 pm

In my testing ABS Cellular Core works fine and passed several tests that Sched 40 PVC fail.

My test cannon is going into the 8th year of use. Still going strong.
I'll post the 2010 pressure test photos later. 2009 pressure test is posted in this thread.
http://www.spudfiles.com/forums/abs-cellular-core-test-cannon-t17968.html For a 1X combustion, I think ABS is tougher than PVC. It is less likely to crack and shatter.

A discussion on ABS Cellular core pipe is here;
http://www.spudfiles.com/forums/foam-core-pvc-t19674.html

The biggest problem is it is soft enough and flexible enough that Cleanout Caps tend to blow off of them. Don't stand directly behind one.

There are several examples on the internet with higher power applications (Acytelene or oxygen added) that has split ABS. It is true it tends to split lengthwise and not shatter into shards.
  • 0

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

Unread postAuthor: SpudBlaster15 » Tue Apr 27, 2010 1:23 am

iknowmy3tables wrote:standard abs is typically cell core so it's not that safe, but it is a combustion cannon so it's should be okay


He's in Canada, where cellular core ABS is virtually nonexistent. Solid wall ABS is safer than any type of PVC for use as a combustion launcher building material.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: Technician1002 » Tue Apr 27, 2010 1:35 am

On close examination of the photos of the cannon, it looks like something besides black ABS cement was used for assembly. Please tell me it was glued with the correct glue. :shock: Many glues do not bond well to ABS. ABS cement will solvent weld the stuff.
  • 0

Attachments
ABSglue.JPG
Is this black ABS glue?
ABSglue.JPG (15.53 KiB) Viewed 4147 times
User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: SpudBlaster15 » Tue Apr 27, 2010 3:21 am

Technician1002 wrote:On close examination of the photos of the cannon, it looks like something besides black ABS cement was used for assembly.


It's yellow ABS cement; the black version is very scarce in this country.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: David603 » Tue Apr 27, 2010 5:18 am

Yes it was properly glued. The black and shiny stuff is abs primer and the yellow one is abs cement
  • 0

User avatar
David603
Private
Private
 
Posts: 9
Joined: Mon Apr 26, 2010 8:44 pm
Reputation: 0

Unread postAuthor: starman » Tue Apr 27, 2010 5:22 am

Nice job! Not sure what kind of "grinding, cutting and tapping" you did on your propane bottle adapter...all you should have to do is unscrew the crooked torch pipe out of the valve adapter housing. It's locked in pretty good with an epoxy of some sort but it can be broken loose with some big pipe wrenches or a pipe wrench and a vise and some he-man effort.

Once the torch pipe has been unscrewed, you can screw a 1/4" compression (tube) brass fitting in there...usually a 1/4" tube to 1/4" NPT brass adapter will do the trick.
  • 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: SpudBlaster15 » Tue Apr 27, 2010 5:35 am

starman wrote:It's locked in pretty good with an epoxy of some sort but it can be broken loose with some big pipe wrenches or a pipe wrench and a vise and some he-man effort.


I'm pretty sure it's blue threadlocker, and it does require some effort to remove. It's beneficial to heat the area to a moderate temperature before attempting to remove the fitting, as this weakens the bond and allows the joint to come apart more easily.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: mark.f » Tue Apr 27, 2010 5:56 am

Excellent job David. The only nitpick I had was brought up by SB15 in the first reply, so I'll leave it at that.

Can't wait to see the next one.
  • 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

Next

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'