Forum: Technology

Hypersonic vehicles - Magnetohydrodynamic (MHD) propulsion



Search Search  Register Register  Private Messages Private Messages
guidelines Forum Guidelines
Post new topic   Reply to topic   1, 2  Next
View previous topic Log in to check your private messages View next topic
Author Message
jetblast16
PostPosted: Mar 06, 2006 - 12:06 AM Reply with quote Back to top
Active Member
Active Member


Joined: Aug 23, 2004 - 01:12 AM
Posts: 216
Location: USA
Status: Offline
Quote:
Plasma Balls and Fire Sheaths

"In a remarkable series of theoretical studies and engineering tests, scientists at the Rensselaer Polytechnic Institute in New York have come up with a way to protect aircraft cruising at 30,000kts (55,550km/h) from the effects of friction with the earth's atmosphere. David Baker PhD examines the idea behind the concept and reviews progress toward an entirely new generation of flying vehicles threatening to outdo anything yet projected by science fiction.

Read on at http://www.aeronautics.ru/mach50.htm


I know that is definitely out there, but very interesting none the less.
Imagine cruising to a target at Mach 30... I know this won't happen
anytime soon, but, it may happen down the line...
 View user's profile Send private message  
 
Sponsor
New postPosted: May 23, 2013 - 4:47 AM Back to top
F-16.net Sponsor





  Send private message  
 
flanker_hater
PostPosted: Mar 06, 2006 - 03:51 AM Reply with quote Back to top
Enthusiast
Enthusiast


Joined: Apr 06, 2004 - 09:58 AM
Posts: 99

Status: Offline
MHD was also used on the "Red October" wasn't it?
 View user's profile Send private message  
 
Guysmiley
PostPosted: Mar 06, 2006 - 08:03 PM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: May 26, 2005 - 08:39 PM
Posts: 1496

This is more of the "plasma magic" that brought us the "active plasma stealth" pipe dream.

Honestly, does:


seem plausible to anybody here?
 View user's profile Send private message  
 
RyanCollins
PostPosted: Mar 06, 2006 - 09:18 PM Reply with quote Back to top
Forum Veteran
Forum Veteran


Joined: Nov 07, 2004 - 07:24 PM
Posts: 651
Location: Mar del Plata, Argentina
Status: Offline
What kind of propulsion has the Aurora? (If it's true)

_________________
A circle is the reflection of eternity: It has no beginning, and it has no end...
 View user's profile Send private message  
 
Guysmiley
PostPosted: Mar 06, 2006 - 09:57 PM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: May 26, 2005 - 08:39 PM
Posts: 1496

Currently, the Aurora uses engines that run on the imagination of aviation writers everywhere. Very Happy
 View user's profile Send private message  
 
RyanCollins
PostPosted: Mar 06, 2006 - 10:05 PM Reply with quote Back to top
Forum Veteran
Forum Veteran


Joined: Nov 07, 2004 - 07:24 PM
Posts: 651
Location: Mar del Plata, Argentina
Status: Offline
Wink OK Very Happy

_________________
A circle is the reflection of eternity: It has no beginning, and it has no end...
 View user's profile Send private message  
 
apags27
PostPosted: Mar 06, 2006 - 10:22 PM Reply with quote Back to top
Active Member
Active Member


Joined: May 03, 2005 - 12:47 AM
Posts: 154
Location: Shaw AFB
Status: Offline
Rumor has it, the Russian engines are a bit better.
 View user's profile Send private message  
 
LWF
PostPosted: Mar 07, 2006 - 02:53 AM Reply with quote Back to top
Active Member
Active Member


Joined: Jun 13, 2005 - 01:20 AM
Posts: 190

Status: Offline
Here's the problem, Magneto means magnet, hydro means water, and dynamic means moving, put them together and you get magnet-moving-water. That illustration and essay or whatever you call it don't involve magnets moving water.

_________________
It takes a fighter with a gun to kill a MiG-21!
 View user's profile Send private message  
 
Shonuff
PostPosted: Mar 07, 2006 - 03:10 AM Reply with quote Back to top
Enthusiast
Enthusiast


Joined: May 10, 2005 - 01:14 PM
Posts: 37

Status: Offline
it doesn't have to be water. Does it involve any liquid at all?


Last edited by Shonuff on Mar 07, 2006 - 04:02 AM; edited 1 time in total
 View user's profile Send private message  
 
jetblast16
PostPosted: Mar 07, 2006 - 03:21 AM Reply with quote Back to top
Active Member
Active Member


Joined: Aug 23, 2004 - 01:12 AM
Posts: 216
Location: USA
Status: Offline
http://www.eng.rpi.edu/mane/lightcraft/Curriculum/TAVD/

Good link, "The LightCraft Project"...
 View user's profile Send private message  
 
Guysmiley
PostPosted: Mar 07, 2006 - 04:02 AM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: May 26, 2005 - 08:39 PM
Posts: 1496

The "LightCraft" experiment was a small spin stabilized test vehicle (about 6 inches in diameter) that rode up a laser beam. Interesting experiment, but they found that atmospheric dispersion and wind limited it's practicality. Nothing remotely "magnetohydrodynamic" about it.

Most of the links from that page are dead.
 View user's profile Send private message  
 
Gums
PostPosted: Mar 11, 2006 - 07:33 PM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: Dec 16, 2003 - 05:26 PM
Posts: 1439

Status: Offline
Salute!

The MHD concept that is most interesting went "black" in the mid-70 period.

It wasn't intended for propulsion, but to generate a few megawatts of electricity for a short period of time.

Apparently, the plasma going out the exhaust passed some grids that stripped the electrons or other doofers and developed an immense potential between the grids. It was alleged that one of these things about the size of a 2,000 pounder could crank out a few megs of juice for a few seconds.

The alleged use of the electricity was to power a huge laser. So we all started to think we could have the "real" Colonial Viper's weapons for our newly-minted USAF Vipers. Just point and shoot. No lead angles, a half a mile range or more, and could be used for ground attack.

Wonder what ever happened......

_________________
Gums
Viper pilot '79
"God in your guts, good men at your back, wings that stay on - and Tally Ho!"
 View user's profile Send private message  
 
Guysmiley
PostPosted: Mar 12, 2006 - 01:25 AM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: May 26, 2005 - 08:39 PM
Posts: 1496

Hey Gums!

The plasma between grids deal sounds like the same kind of tech in an ion drive. Which is what powered NASA's Deep Space 1 http://nmp.nasa.gov/ds1/. What was really crazy is supposedly the TIE in George Lucas' TIE fighters stands for "twin-ion engine"... Of course the DS1 ion engine only works in a vacuum. Air has an annoying tendancy to conduct electricity once the voltage gets high enough (ala lightning).
 View user's profile Send private message  
 
sferrin
PostPosted: Mar 12, 2006 - 07:46 AM Reply with quote Back to top
Elite 1K
Elite 1K


Joined: Jul 22, 2005 - 04:23 AM
Posts: 1613

Status: Offline
Gums wrote:
Salute!

The MHD concept that is most interesting went "black" in the mid-70 period.

It wasn't intended for propulsion, but to generate a few megawatts of electricity for a short period of time.

Apparently, the plasma going out the exhaust passed some grids that stripped the electrons or other doofers and developed an immense potential between the grids. It was alleged that one of these things about the size of a 2,000 pounder could crank out a few megs of juice for a few seconds.

The alleged use of the electricity was to power a huge laser. So we all started to think we could have the "real" Colonial Viper's weapons for our newly-minted USAF Vipers. Just point and shoot. No lead angles, a half a mile range or more, and could be used for ground attack.

Wonder what ever happened......



Hmmm. Sounds like a generator I read about in the 80s but the idea was to use it to power a railgun on an armored vehicle.
 View user's profile Send private message  
 
locum
PostPosted: Mar 12, 2006 - 05:29 PM Reply with quote Back to top
Active Member
Active Member


Joined: Feb 05, 2005 - 02:20 AM
Posts: 132

Status: Offline
'Leady, leady, leady oooohhh Starbuck, pulsed power machines. A pulsed power generator can be used to power: a laser, an electro-magnetic railgun, or an EM pulse weapon. Sferrin are you pointing at the Sandia Laboratory Hermes III or Z-machine?. An EM railgun was also tested by Sandia, this could reach a muzzle velocity of 6 km/s ( 19.672 ft/s), a 105/ 120mm tankgun reaches 1.700 m/s (5574 ft/s). But they wanted to use this kind of guns to shoot down ballistic missiles. Funny, in 1992 the USAF revealed that in the B-2 plasma stealth together with electro-static technology was used to lower RCS and drag.

_________________
Nulla tenaci invia est via.
Tzaruch shemirah, hasof bahr
 View user's profile Send private message  
 
Display posts from previous:     
Jump to:  
All times are GMT + 1 Hour
Post new topic   Reply to topic
View previous topic Log in to check your private messages View next topic