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 48 users online :: 4 registered, 0 hidden and 44 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

my giant cannon. not really getto

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 

How much do you like it ?

Total nube
0
No votes
Not so good
0
No votes
Decent
3
100%
Sweet
0
No votes
Awsome
0
No votes
 
Total votes : 3
  • Author
    Message

my giant cannon. not really getto

Unread postAuthor: vblock » Sun Mar 14, 2010 3:11 pm

hows it going guys ? I hope im doing this right im not so good on the computer but my cannon seams decent . here is some specs. Chamber size. 4"x48" abs. only because i have had bad experinces with pvc :x . the barrle is 1 1/4 with 3 sections for easy transport to 3 foot pieces and a 2 footer to finish er off . the spark gap is just 3 bolts to form the gap and a electric bbq inginiter modded to use a seprate battery pack normals 1 AA but with to in series i get twice as fast shots with better sparks . it has a 3 1/2 " fan i think no quite shure. i think it takes about 55 psi i forget and the meter is ran off a bernzomatic torch modded to do the job all i do is turn it on when the psi guage reads 55 i close the ball valve and turn it off. i think im only getin about 150 yards to be truthfull and im told im splittin potatos. what you think ?
  • 0

Attachments
SNC00189.jpg
SNC00199.jpg
SNC00199.jpg
SNC00189.jpg
SNC00190.jpg
SNC00195.jpg
SNC00197.jpg
SNC00199.jpg
SNC00200.jpg
Last edited by vblock on Wed Apr 20, 2011 2:43 pm, edited 7 times in total.

vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Re: my giant cannon. not really getto

Unread postAuthor: jackssmirkingrevenge » Sun Mar 14, 2010 3:15 pm

vblock wrote:my pictures are to big :( how do i fix this


Open them with Paint Image

Click on "Image" on the toolbar then "Stretch/Skew"

Change "Horizontal" and "Vertical" to 50% isnead of 100%
  • 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

Unread postAuthor: vblock » Sun Mar 14, 2010 3:19 pm

thanks alot man ill upload some then

welll what does everyone think ;D. what you think my range will be ?

Edited by jrrdw.
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Mar 14, 2010 3:31 pm

Not a bad effort :) in terms of performance, if it's range you want then potatoes are the worst possibly ammunition - low density, poor aerodynamic shape and no stability.

For maximum range, you'll need to make some sort of saboted dart along these lines:

Image
  • 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

Unread postAuthor: deathbyDWV » Sun Mar 14, 2010 3:37 pm

Looks good. Just be careful. Give us some damage pics soon!
  • 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 » Sun Mar 14, 2010 4:59 pm

You definitely need more than one spark gap for that chamber.
  • 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: vblock » Sun Mar 14, 2010 6:49 pm

thanks alot man :) ill think about that . and haha ill try but the one gap seams to spark well spud blaster in the cold it takes 3 three seconds to fire ? with decent ammo hows 200 yards ? is it too big you guys think ? i dont reallly know what to expect with this gun
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: McCoytheGreater » Sun Mar 14, 2010 6:53 pm

SpudBlaster15 wrote:You definitely need more than one spark gap for that chamber.


Mike from UltimateSpudgun has a theory that I want to experiment with. He claims it works on larger spudguns (like this one and our ME1-05H). Put the spark gap at the very back. This will cause two pressure waves, right? Right. as the pressure wave moves forward toward the barrel the gasses compress creating a quasi-hybrid effect which detonates the gas. I haven't tested it on our gun, but as soon as I can I will. Remember, this is for large/long chambered guns...like yours. have fun. Looks good! I'm really digging the ABS. Are you going to make a shroud for the MAPP tank...you know...just for aesthetic purposes? that would be cool.
  • 0

User avatar
McCoytheGreater
Sergeant Major
Sergeant Major
 
Posts: 191
Joined: Tue Dec 15, 2009 1:10 am
Location: Mississippi State
Reputation: 0

Unread postAuthor: vblock » Sun Mar 14, 2010 9:34 pm

well im not shure actuly im not a fan of the shrouds not shure why . do you think i should paint it ?. and yeah i have only shot it twice at about -30 outisde i noticed it was very quite when it shot and the potatos didnt go more them 150 yards
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Unread postAuthor: Insomniac » Sun Mar 14, 2010 11:43 pm

If you continue running that sparker at twice it's rated voltage, chances are it won't last too long. I'd reccommend that you go back to 1 AA, as it should only require one spark to ignite anyway. Depending on the circuit, if you put the 2 AA's in parallel you may get a slightly higher spark rate as they will be able to deliver more current and this should be safer than running it at a higher voltage.
  • 0

I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
User avatar
Insomniac
Major General
Major General
 
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia
Country: Australia (au)
Reputation: 0

Unread postAuthor: Moonbogg » Mon Mar 15, 2010 1:14 am

maybe the barrel connections are causing the spuds to split.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: vblock » Mon Mar 15, 2010 9:35 am

that could be. im not very shure but i dont think i can afford another one for awhile . the barrels touch almost perfectley tho
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Unread postAuthor: CpTn_lAw » Mon Mar 15, 2010 11:52 am

McCoytheGreater wrote:
SpudBlaster15 wrote:You definitely need more than one spark gap for that chamber.


Mike from UltimateSpudgun has a theory that I want to experiment with. He claims it works on larger spudguns (like this one and our ME1-05H). Put the spark gap at the very back. This will cause two pressure waves, right? Right. as the pressure wave moves forward toward the barrel the gasses compress creating a quasi-hybrid effect WHICH DETONATES THE GAS . I haven't tested it on our gun, but as soon as I can I will. Remember, this is for large/long chambered guns...like yours. have fun. Looks good! I'm really digging the ABS. Are you going to make a shroud for the MAPP tank...you know...just for aesthetic purposes? that would be cool.


I'm not sure You actually wanna detonate a gas, that is unless your cannon is stainless steel, with 1" wall thickness. The detonation in a chamber is not dangerous by the pressure itself, it's the rapid spike that makes it not suitable at all.
Plus, what you're telling here sounds a bit like a light-gas gun. The piston being the pressure wave at the back. Again, you're not going to get that much power. The excess you might get would result from a (maybe) better burn of the gas mixutre.
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: vblock » Mon Mar 15, 2010 4:45 pm

haha i just realized the battery pack was still gettin held on with the maskin tape waitin for the epoxy to dry
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Unread postAuthor: vblock » Mon Mar 15, 2010 4:55 pm

how do i put up a preview ?? sorry im not good with computers
  • 0


vblock
Private
Private
 
Posts: 20
Joined: Tue Dec 29, 2009 12:49 pm
Reputation: 0

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'