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 46 users online :: 4 registered, 0 hidden and 42 guests


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

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

SACG - Somewhat Advanced Combustion Gun

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

SACG - Somewhat Advanced Combustion Gun

Unread postAuthor: psycix » Tue May 13, 2008 7:19 am

SACG - Somewhat Advanced Combustion Gun

This is my first combustion cannon I built. Nothing really special, just a bunch of advanced ghettoness.
Its about one year old now though it started off as a spray and pray and ended with the following specs:

-Chamber: 110 mm diameter, about 27,5 cm long, 2600cm^3 volume.
-Barrel: 50mm barrel, ID about 43mm, perfect for golfballs. Length: 145cm, 2100cm^3 volume.
C:B ratio: about 1.2
-92mm chamber fan
-Dual spark gap, "multisparking" piezo ignition.
-Butane metering

Stuff about it:
-The metering system is quite crappy, due to the fact I couldnt find propane around, I went with butane, wich has way too low vapor pressures. The pressure from the tank differs all the time, and on top of that I couldnt find any adapter for it and had to go with some sort of crappy pressure relief valve wich further reduces pressure. But after I hammered a long nail into it and covered the hole with solder, it worked. When the pressure is too low, I just inject another shot and it became a "inject, guess and pray".
-The fan system is a 9V battery ducttaped to the chamber and to turn it on I just attach the wires to the bolts wich connect to the fan inside.
-The ignition system is a rare form of piezo sparker. On a small spark gap as it is intended to be, it gives about 10-20 sparks on both pressing and releasing the ingnitor. When enlarging the spark gap it does less sparks.
On the current setup it sparks 2 or 3 times on both the press-in and the out.
Ofcourse I only need one spark so its quite useless but its a weird thing.



When was a spray and pray and I shot onto my barn door a few times. The potatoes splattered, no damage to barn.
Then, some other day, I added the chamber fan and used the second spark gap.
I shot onto a wooden board that was in front of my barn door.
The potato went TROUGH the board and then TROUGH the barn door!
Ehmmm... dad? I got something to tell you...
I was afraid that this would be the end of my so far shortlived spudding carreer because my parents wouldnt allow any more guns.
But my dad wasnt angry, he even wanted me to fire it again because at first he didnt believe that the potato when trouough both the board and the door. He was quite impressed, and fixed the door.
And that was just a potato, now imagine a golfball, or worse...

Pictures:
  • 0

Attachments
damage.JPG
The board and barn door wich both got destroyed. The board on purpose, the door by accident.
chamberfan.JPG
The 92mm fan, blades are a little bit dirty because some earth got into my chamber while playing in the outdoor.
muzzle-end+ammo+spudcutter.JPG
Look how well they fit :D
muzzle-end+ammo+spudcutter.JPG (15.45 KiB) Viewed 2065 times
SACGchamber.JPG
SACGchamber.JPG (35.02 KiB) Viewed 2065 times
ghetto-fancircuit.JPG
operating the tool.JPG
This is how I hold it.
mewithSACG.JPG
Yup thats me and my creation.
overview.JPG
This is it.
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: jrrdw » Tue May 13, 2008 7:23 am

Dam! :shock: What else can I say. Besides, nice work!
  • 0

Last edited by jrrdw on Tue May 13, 2008 7:42 am, edited 1 time in total.
When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: JDP12 » Tue May 13, 2008 7:29 am

nice gun and damage shots!!
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Tom » Tue May 13, 2008 8:19 am

HMMM do you like Korsakoff her self or hardcore music :D .
Tom
  • 0

Really really proud member of the Dutch Spud Clan!

Tom
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Fri Aug 24, 2007 8:22 am
Reputation: 0

Unread postAuthor: sniper hero » Tue May 13, 2008 8:36 am

cool
but is it pressure rated ?
it looks like the ordinary pvc.
and tom I was first like huh why korsakoff but now I understand 8)
  • 0

proud member of dutch spud clan
coming: semi auto pellet sniper:D
User avatar
sniper hero
Captain
Captain
 
Posts: 332
Joined: Fri Mar 07, 2008 3:12 pm
Reputation: 0

Unread postAuthor: psycix » Tue May 13, 2008 9:10 am

Thanks for the replies :D

@tom and sniper hero
Hahah yeah I like hardcore music :D
And DJ korsakoff is one of my favorite artists. Also, she looks good on a poster.

@ sniper hero
Define pressure rated.
Something thats rated for 30 psi also is pressure rated.
But your right on one hand:
This is not like DWV, but also not really pressure pipe.
I googled up specs and it should be able to hold about 6.2 bar.
Its fine for combustion... I think.

Anyways it didnt explode yet, and Im not planning to do much more shots with this gun.
I built this to get some experience with combustion cannons. I will post some other cannons soon.

Though this is my first combustion, it may also be my last one. Combustions are illigal in the netherlands and pneumatics are not while having more power.
Exept one "recreational combustion" wich is designed for ease of use, all following combustions will probably be hybrids.
But I expect those projects will not yet be started before this christmas.
Im going to play around with pneumatic power this summer.
  • 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

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'