If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
It is funny that you ask, as i pulled it out a few days ago. Anyway, no a battery would not help at all :). You need high voltage, and batteries are very low volage compared to what is needed. The higher the voltage, the longer the gap can be and the easier it will combust and it will give more complete combustion. A good voltage would be maybe 30,000 volts, and the highest available battery is only 12 volts. A BBQ igniter is pretty cheap and it works great. I made a new spudgun awhile ago, i guess i never showed it. It is small, portable, and very strong for how small it is. It will explode a full unopened coke can, if i use a little soft thing from the end of a badminton birdie and a spark plug as the main projectile, and i can blow a hole through a 1/4 inch piece of plywood. I will post the videos as soon as i have a conversion file so i can hook all the vid's together so i can put them on youtube. I will take a pic later though.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
a good ignition source that is cheap, easy to use, and compact is the piezoelectric ignition unit from an electric lighter... the gas grill kind are a little long to use and are not powerful enough to arc on their own without modifying the terminal postions, so you'd have to run the wire through a hole into the inition chamber... the piezo unit can be mounted in a small hole in the wall and still arc to itself ^_^
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, the BBQ grill igniter is piezoelectric. And what i did was simply cut a hole in on of the end caps(could just be anywhere in the combustion chamber) and put the igniter in it and glued around it to make a near air tight fit. I just used a piece of wire going from one of the terminals of the igniter and brought it about half an inch from the other terminal to make a little spark gap. It works nicely and every time as long as i have the right amount of gas.
Registered Member #1370
Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
I'm working also on a spud gun. I have done a pneumatic gun which was used at 8bar. It has about 15mm wide metal tube and shoots AA batteries. Friend shooting in 2007:
Now I have a 1000x50mm polypropylene pipe for shooting various stuff with pressurised air. Also propane/butane gas would be nice to test.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Homemade spud gun.
