My second spudgun- PC 2008 ! enjoy!

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 11:15 am

This is my second spud gun! It is made from PVC ! Pipes are made in Germany.

Components:
1. 50mm pipe as barrel
2. reducer from 50 - 110mm
3. 2x elbow 90 degrees 110mm
4. 2x female-female things 110mm
5. 110mm cover
6. small PC fan
7. screws
8. for fuel I use the hairspray.

I wan to ask you guy's which is the best fuel for gun like this ???

This is one test video where I was shooting with newspaper...
[youtube][/youtube]

Please comment . . .(by the way - sorry about my language)
Attachments
little plan . . .
little plan . . .
gun.JPG (39.46 KiB) Viewed 4671 times
DSC03891.JPG
Front side
Front side
Last edited by Grizzlybear on Sun Apr 06, 2008 10:55 am, edited 1 time in total.
User avatar
starman
Sergeant Major
Sergeant Major
United States of America
Posts: 3027
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC

Donating Members

Wed Apr 02, 2008 12:27 pm

That is one monster chamber you've got on that thing, way overkill for your barrel. I assume that opening on the side of the chamber is where you will spray in your fuel.

Grind a knife around the opening of your barrel. That will make it easier to load potatos into the barrel and they will fit more tightly in your barrel.

I would normally recommend a propane metering system but with the size of that chamber you probably should just leave it as a spray and pray.

Build yourself a new cannon with a smaller chamber and propane metering system using techniques you find on there pages.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 12:38 pm

If you say that chamber is too big maybe I need smaller barrel or use this size just get it longer ???

I know that propane will be better but It is quite expensive - tnx for idea!!!

yea and about that barrel opening - I know , just I haven't done it jet !
User avatar
Spuddin
Specialist 2
Specialist 2
Posts: 262
Joined: Wed May 16, 2007 1:28 pm
Location: Oklahoma
Contact:

Donating Members

Wed Apr 02, 2008 12:41 pm

really nice gun, i like where you have the handle with the built in ignition and fan switch, pretty clever. any idea how far it launches your ammo?
and the smiley face fits perfect! lol.
_______________________
http://www.freewebs.com/spuddin
User avatar
scottcrete
Specialist 3
Specialist 3
Posts: 332
Joined: Tue Mar 18, 2008 1:26 am
Location: Bridgeport, West Virginia USA

Wed Apr 02, 2008 12:43 pm

is it bolted together? is this pvc or metal?
User avatar
Maniac
Specialist 4
Specialist 4
Posts: 496
Joined: Tue Oct 23, 2007 5:55 pm
Location: Right behind you

Wed Apr 02, 2008 12:43 pm

The barrel actually needs to be longer propane metering would actually be grat those bottles almost never run out when using them with a spudgun.
Coodude26 wrote:
People who laugh really hard at stuff that pisses you off/you getting hurt, who then say "I'm sorry, I can't stop" but you know they easily could.

Mr.C: That's not as easy as you think. It's like me kicking you in the balls and telling you to stop crying.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 12:47 pm

I don't know because I have this gun about a week so I have lots of tests in future... Old gun was shooting around ~ 80-90m (250feet) Maybe this gun can do something more
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 12:48 pm

It is PVC and lots of screw's
Attachments
oldone
oldone
User avatar
starman
Sergeant Major
Sergeant Major
United States of America
Posts: 3027
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC

Donating Members

Wed Apr 02, 2008 12:56 pm

Grizzlybear wrote:If you say that chamber is too big maybe I need smaller barrel or use this size just get it longer ???

I know that propane will be better but It is quite expensive - tnx for idea!!!

yea and about that barrel opening - I know , just I haven't done it jet !
Without getting exact here, just cut that chamber in half and add maybe .5 to 1 meter of barrel length. You'll gain performance and not gain any overall gun weight.

Propane is only $2.50 US for a 14 oz tank in Amercia, probably a little more expensive in Germany. However, one tank will more than likely last the life of the gun...and will burn cleaner and look cooler..:)
User avatar
Maniac
Specialist 4
Specialist 4
Posts: 496
Joined: Tue Oct 23, 2007 5:55 pm
Location: Right behind you

Wed Apr 02, 2008 12:57 pm

why did you use screws and not pvc primer and cement is it not available in Germany.
Coodude26 wrote:
People who laugh really hard at stuff that pisses you off/you getting hurt, who then say "I'm sorry, I can't stop" but you know they easily could.

Mr.C: That's not as easy as you think. It's like me kicking you in the balls and telling you to stop crying.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 12:59 pm

starman wrote:
Grizzlybear wrote:If you say that chamber is too big maybe I need smaller barrel or use this size just get it longer ???

I know that propane will be better but It is quite expensive - tnx for idea!!!

yea and about that barrel opening - I know , just I haven't done it jet !
Without getting exact here, just cut that chamber in half and add maybe .5 to 1 meter of barrel length. You'll gain performance and not gain any overall gun weight.

Propane is only $2.50 US for a 14 oz tank in Amercia, probably a little more expensive in Germany. However, one tank will more than likely last the life of the gun...and will burn cleaner and look cooler..:)
I am from Latvia - the pipes are from Germany !
User avatar
starman
Sergeant Major
Sergeant Major
United States of America
Posts: 3027
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC

Donating Members

Wed Apr 02, 2008 1:02 pm

BTW, why all the screws in the couplers and pipe? Can't you get PVC solvent glue there? A good solvent weld as all you need for these things.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 1:05 pm

I know there is many mistakes :cry: but i trust screws! 8)

However, I learn a lot from this forum ,so in the future there will be some great combustion from me :P :P :P
User avatar
starman
Sergeant Major
Sergeant Major
United States of America
Posts: 3027
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC

Donating Members

Wed Apr 02, 2008 1:21 pm

Grizzlybear wrote:I know there is many mistakes :cry: but i trust screws! 8)
You can trust PVC solvent cement too my friend, believe me. It's a LOT less work. Also drilling all those holes in PVC weaken it structurally.

I do admit those screws give it a certain industrial look...they just aren't necessary.
User avatar
Grizzlybear
Private 2
Private 2
Posts: 37
Joined: Wed Apr 02, 2008 10:35 am
Location: Latvia

Wed Apr 02, 2008 1:31 pm

starman wrote:
Grizzlybear wrote:I know there is many mistakes :cry: but i trust screws! 8)
You can trust PVC solvent cement too my friend, believe me. It's a LOT less work. Also drilling all those holes in PVC weaken it structurally.

I do admit those screws give it a certain industrial look...they just aren't necessary.
it is not like i don't trusting , just screw's was first idea so I used them - that's all...
Post Reply