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 #214
Joined: Sun Feb 19 2006, 07:01PM
Location:
Posts: 4
Holy cow! I leave a bit to study for a fuel system test and when I come back my quetion has exploded into an extreamly facinating debate/knowlege exchange. I have learned a lot from these posts. Thank you very much and and please dont stop. I will have to blame you all for my new addiction (HV & rail guns). Thank you again. I think that I will need to do a bit more work but I need to find a decent schematic to work off of. Any help there would be greatly appreciated.
As for the self built adjustable inductor. I was hoping that I could use this to learn more about the workings of the circuit by testing its effects on the projectile and rails at different settings to see if I can get improved/decreased performance with it. I was inspired by the fly wheel effect that is often taken advantage of in class C amplifiers. The idea of it helping or not having any real effect is exciting. I would like to start simulations to see which it may be.
I think that I will start with the lytics. Price point being the main driver for this. As for them breaking I hope at least one does - it will then be usefull as a classroom visual aid. Thus I will acheive a net gain either way.
I love the math that was mentioned in some of the earlier posts. The more I can get the better.
I am also brain storming ideas for the construction of the barrel. I have a fair idea of how to reduce friction and possibly avoid the use of injectors (or use a solenoid to start the movement and use opto electronics to trigger).
But before I can do that I need to get two things decided fairly firmly: Cap bank size/strength and mass/composition of the projectile. Once I can get the rough idea of a good mass for the projectile I can make it aerodynamic and have a good CG for flight. Then I can design the barrel arround it. It seems to me to be an area that there is not a lot of discussion about that can make a difference in the performance of the overall design. I see some fun times in the machine shop soon.
Registered Member #188
Joined: Thu Feb 16 2006, 05:18PM
Location:
Posts: 67
Electrolytic caps do work well, if the right ones are chosen. Epcos makes some nice low ESR/ESL capacitors, others probably too. These are made for high current, as can be seen from the almost 2cm thick connection bolts with about 20x the connection surface compared to typical 36D Capacitors. Im having 25 pcs around, specified 12000µF 350V, 91x150mm, 17miliohm ESR 13nh ESL but i dont have any time for making the railgun i bought these for, so im selling these.
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.
Choosing Capacitors for Railgun [was "Greetings..."]