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 65 users online :: 4 registered, 0 hidden and 61 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

Full Automatic Single Barrel Spud Gun -F-A-K-K-

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

Unread postAuthor: Jarrado » Thu Mar 14, 2013 12:07 am

What was the approximate cost in materials? Seems like quite a bit.
  • 0


Jarrado
Private
Private
 
Posts: 22
Joined: Thu Nov 15, 2012 12:14 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Mar 14, 2013 1:03 am

POLAND_SPUD wrote:I agree with jsr on this

I agree with jsr on this

I agree with jsr on this


:shock: :shock: :shock:

Image

getting mix to ignite isn't easy... and it's not that difficult to source tanks that are rated to more than combustion pressure of say 20X mix


Yup... though to be honest I really don't think that's necessary. The benefits would be tremendous, it really would just be a question of alternating between opening a single valve and ignition, dead simple.

I wonder if a tank-style bore evacuator would work:

Image

... though really if you're injecting air and fuel, you don't really need to vent the chamber.

If this is (kind of) the holy grape


Available on Amazon :D

Image

-F-A-K-K-


Stands for Fully Automatic Kartoffel Kanone, but sounds like the sort of noise a seagull would make before slamming into a cliff :)
  • 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: POLAND_SPUD » Thu Mar 14, 2013 9:23 am

:wink:

I wonder if a tank-style bore evacuator would work

I doubt there is need to complicate something we haven't got to work ourselves yet :D
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: ramses » Thu Mar 14, 2013 10:51 am

jackssmirkingrevenge wrote:
ramses wrote:We call that a bomb.


Let's call it a bomb.



I realize that accidental ignition is very unlikely, but I would recommend something that might be able to take the combustion pressure (like a 20oz CO2 tank), and something that has a controlled over-pressure mechanism (again, like the burst disk on a CO2 tank).

I was only trying to point out that IF it was ignited accidentally, it could be a bad day.
  • 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

Unread postAuthor: POLAND_SPUD » Thu Mar 14, 2013 11:09 am

I was only trying to point out that IF it was ignited accidentally, it could be a bad day.
Only IF your pressure vessel can't handle the max pressure the mix can generate or IF it doesn't have a burst disk
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: Hugeapnic » Thu Mar 14, 2013 11:48 am

About barrel evacuation:
Do you guys know how pulse-jet engine works???
These engines make about 50 to some 100 cycles per second by bringing the whole system in resonance. We just need a way to load the tube with ammo then......

Maybe store the ammo inside of the combustion chamber and release it piece by piece.....


About cost:
Tubing 10€
Arduino 15€
Display 15€
3 servos 50€ (but can be done with 10€ all together)
Plastic casing 6€
EDF + ESC 30€
Battery 10€
BEC 10€
Relais 5€
Ignition 15€

So about 150€/$. But can be easily made with half the price if you want to do more soldering and manufacturing...

Most of the parts I had on my stock, so it's mainly ignition, tubing and the casing I had to buy.

Right now I am little surprised that it is "that" expensive, but the fun is priceless...
Fun building AND the fun shooting!!!
  • 0


Hugeapnic
Private
Private
 
Posts: 9
Joined: Mon Mar 11, 2013 1:20 pm
Reputation: 0

Unread postAuthor: ramses » Thu Mar 14, 2013 12:20 pm

POLAND_SPUD wrote:
I was only trying to point out that IF it was ignited accidentally, it could be a bad day.
Only IF your pressure vessel can't handle the max pressure the mix can generate or IF it doesn't have a burst disk


Thus my discouragement of using a 2 liter bottle in favor of a CO2 tank. I suppose you could consider the whole bottle a burst disk, but that still isn't good option.
  • 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: jackssmirkingrevenge » Thu Mar 14, 2013 2:47 pm

ramses wrote:I was only trying to point out that IF it was ignited accidentally, it could be a bad day.


That's a fair assessment, however my contention would be that it would be less risky than, for example, a loaded spudgun would fire by accident, so no reason to be unduly worried about such an unlikely possibility.
  • 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

Previous

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'