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 68 users online :: 4 registered, 0 hidden and 64 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

electrothermal bb launcher idea

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
Sponsored 
  • Author
    Message

electrothermal bb launcher idea

Unread postAuthor: st.croixsurfer » Mon Jun 30, 2008 12:28 am

To start off with i am in no way shape or form asking how to build a cannon ,and i am in no way asking for plans. I am simply and politely asking for the helpful input of people who know what they are doing.

I had an idea for an electrothermal {gun} so to speak that would launch airsoft bb's at rather high velocities with no intention to be shot at people of course.
I plan on using a six millimeter barrel. If anyone has ever bought six mil pipe what is a good place to get it?
Right now i am in possesion of a 70 joule capacitor bank and i am wondering if that will be enough...
I plan on using a trigatron to trigger the capacitors. If anyone has had any experience with making a trigatron what were some of the problems you encountered if any?
I am going to use steel wool for the material that the cap bank will discharge through.
If you have any helpful insight into any problems i may encounter during the production of such a device please by all means leave a comment below stating such.
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: SpudFarm » Mon Jun 30, 2008 1:34 am

the best person to talk with is Larda.

if you want i can PM you his MSN adress, i am sure he will help

but he used 2880 joules.
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: psycix » Mon Jun 30, 2008 4:39 pm

2880 joules, 70 joules, whats the difference? :roll:

Maybe, instead of an ETG, you could try a coil gun. But that will only work with ferromagnetic projectiles ofcourse, like nails. (Not sure if steel bb's work?)
  • 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

Unread postAuthor: THUNDERLORD » Mon Jun 30, 2008 4:42 pm

IDK about a "Trigatron" but this guy called "the Judge" on here knows about flex capacitors. :P
  • 0

-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

Unread postAuthor: Sticky_Tape » Mon Jun 30, 2008 4:47 pm

psycix wrote:2880 joules, 70 joules, whats the difference? :roll:

Maybe, instead of an ETG, you could try a coil gun. But that will only work with ferromagnetic projectiles ofcourse, like nails. (Not sure if steel bb's work?)


Steel is ferrous so yes steel bb's would work. He wouldn't need to use a ferrous projectile he could use sometype of ferrous sabbot basiclly just a slug behind the bb. Maybe the slugg would be on a leash so at the end of the barrel it would stop sort of like those toy popguns you sometimes see in cartoons.
  • 0

You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
User avatar
Sticky_Tape
Brigadier General
Brigadier General
 
Posts: 1175
Joined: Thu Jan 31, 2008 6:35 pm
Location: Sydney, Nova Scotia, Canada.
Reputation: 0

Unread postAuthor: TurboSuper » Mon Jun 30, 2008 5:17 pm

I dunno, coil guns only give you limited power unless you decide to multi-stage them. I think an ETG is simpler for launching things really fast. Plus it has one helluva muzzle flash :shock:

I find the best barrel for BBs to be brakeline tubing. I used some for my strafer, works beautifully.
  • 0

"If at first you dont succeed, then skydiving is not for you" - Darwin Awards

TurboSuper
Brigadier General
Brigadier General
 
Posts: 986
Joined: Thu Jun 16, 2005 1:44 pm
Reputation: 0

Unread postAuthor: Larda » Mon Jun 30, 2008 7:17 pm

psycix wrote:2880 joules, 70 joules, whats the difference? :roll:

Actually i used 28 800 joules. :D
  • 0

Push to test... Release to detonate.
User avatar
Larda
Donating Member
Donating Member
 
Posts: 119
Joined: Wed Jul 18, 2007 7:52 am
Location: Sweden
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: st.croixsurfer » Mon Jun 30, 2008 7:37 pm

i can get more capacitors.

Larda's seems wicked powerful a little to powerful than i intend mine to be, if i made something like that my mom would have a fit :P
i'll try with 200 joules


p.s. has anyone tried to get free cameras from cvs? got any tips on that? :twisted:
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: rp181 » Mon Jun 30, 2008 7:39 pm

pfft, 28.8KJ and 70 joules are practically the same thing :wink:

BTW, *a company* said that they would provide me with caps once i get a letter from school, i plan on getting 16 400v 15000uf (same values as yours) caps (i could get more pssiably, but those caps are HUGE!)

anyway, back on topic, coilgun with BB's suck, cylinders are better. Electrothermal wont be all that great with 70 joules, more like a little light show.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Unread postAuthor: st.croixsurfer » Mon Jun 30, 2008 7:44 pm

yeah im going to get a lot more caps
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: Hotwired » Mon Jun 30, 2008 7:54 pm

Depends how small the bore is.

I'm partway through linking up 100 capacitors for a 550J bank which will be for a few experiments.
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: st.croixsurfer » Mon Jun 30, 2008 8:01 pm

has anyone tried to get the used disposable cameras from your local cvs or wallgreens?
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: rp181 » Mon Jun 30, 2008 8:01 pm

lol, a hundred caps?
1) if there in series, dilectric breakdown will probably be exceeded, ESR will be high
2) if there parrallel, they will unevenly charge unless theres balancing resistors.
3) a cap will probably fail and it will be hard to find it/repair.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Unread postAuthor: st.croixsurfer » Mon Jun 30, 2008 8:26 pm

my intended projectile will be only .2 to .3 grams is a large amount of joules that necessary?
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: rp181 » Mon Jun 30, 2008 8:52 pm

the thing with electrothermal is large energies are still required to vaporize the fuel. Try it, it will work, but you might not get the speed you would expect. 70 joules is pleanty for a coilgun, try that with cylinder projectiles, you will like it, its also compleatly silent.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Next

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'