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 #1694
Joined: Sat Sept 13 2008, 09:13AM
Location: Australia
Posts: 108
Hi,
I'm thinking of making a hybrid gun that uses an induction launcher to compress air to fire a projectile.
Induction launchers are quite efficient. I see FastMhz was achieving efficiencies of close to 10%. The problem I see with stock standard induction launchers is that the Al plate must have a fairly large area up against the coil for maximum eddy current generation. I figure you could transfer the kinetic energy of the Al plate to a smaller, more aerodynamic slug by using the Al plate to compress air. By doing so you could create a weapon with more penetrating power and range, you could fire a projectile of any material and it would (maybe?) still be more powerful than an equivalent coil gun. Clicky
I reckon I'll try it out with a 400V 100J cap bank to start with.
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
You mean by accelerating some kind of a piston in a cylinder with the barrel and the projectile on the other side? I guess thats an idea. Might be hard to make the piston and the cylinder low-friction (and low maintenance) yet fairly air tight.
Registered Member #1694
Joined: Sat Sept 13 2008, 09:13AM
Location: Australia
Posts: 108
Dago wrote ...
You mean by accelerating some kind of a piston in a cylinder with the barrel and the projectile on the other side? I guess thats an idea. Might be hard to make the piston and the cylinder low-friction (and low maintenance) yet fairly air tight.
Exactly! I imagine there would be significant losses from blow back, but if I could accurately machine the Al disk and the bore of the cylinder, as well as lube it up with some oil, it shouldn't be too bad. I'm thinking about using a short length of PCV pipe with screw on ends as the cylinder. I'd lathe out the centre to make the inside diameter reasonably exact. The pipe would be quite easy to change too, since there is nothing actually attached to it - just unscrew both ends, take out the spring and Al disk and put the new pipe on.
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
Some kind of recessed "rollers" on the side of the piston might be a good idea but hard to accomplish. I don't think a flat piston would move too smoothly in a PVC-cylinder without some kind of "rails" or something to prevent it from jamming in the cylinder. It would be a lot better if the cylinder would be made of metal but obviously it cant due to eddy currents.
Somebody with better theoretical education can think how feasible idea this is
Registered Member #1694
Joined: Sat Sept 13 2008, 09:13AM
Location: Australia
Posts: 108
I suppose the problem could be minimized by using a fairly thick piece of aluminium. Rails would be good too. Rails + thick aluminium + plenty of oil perhaps?
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I don't remember who or where, but there's a thread here somewhere where the author had the Al plate impact a golf ball in order to transfer the energy into a more aerodynamic projectile, similar to how a Newton's Cradle works.
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.
Induction pneumatic hyrbid weapons
