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Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
Please, dont ask what an Ion Lifter is if you are a new member. See here
I have heard that lifters will lift regardless of polarity. Will they work with 15KV 30-90mA 60Hz AC? If not does it have to do with the inertia of air? I really dont want to build or buy a full wave rectifier for it.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The polarity matters somewhat but the trust direction is always the same. It will lift off with both polarities, but one polarity will work better than the other.
The flow is from the conductor generating the highest field density (wire) towards the conductor with the lowest field density (plate). It works fine with two wires of different thickness too.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
DC is necessary, 20-25 kV at somewhat less than 0.5 mA for each gram on the lifter. I have tested only positive voltage on the corona wire, but probably negative voltage works in the same way.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
No cdma you dont need DC, the lifter i flew for my high school grad project in 1999 was powered by a 24 kvac neon sign transformer powered at 60hz through a variac, it will work fine with AC, in fact if this is your first experiment with the lifter idea then use a NST like i did, rectification and caps will cause you headaches, so do ferrite-flyback-diode-dc stuff later when youve learned more.
Oh yaeh and my NST name plate says 24KVAC at 28ma, however i found at 122.5vac input, the output was 34~36 KVac at 5ma.
BTW my masters/phd thesis is based on the deseversky design though Evgeji Barsoukov and i have made improvements.
Registered Member #2316
Joined: Tue Aug 25 2009, 03:04AM
Location: Bendigo, Australia
Posts: 107
Remember that a certain amount of capacitance is required for a lifter to work, Thus 50 or 60Hz will work (theoretically) but 10 to 20 KHz won't work because the impedance will be lower due to the increased frequency. Also from what I have read you will get better performance with the corona wire connected to negative.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Capacitance can only affect the operation of a lifter if too much of the power supply current flows trough displacement current instead of conduction trough the ionic wind. The capacitance between the corona wire and the body is at most a few pF, while the linearized resistance is of about 20 MOhms (20 kV, 1 mA). Assuming 5 pF, the frequency where both currents are identical is 1.6 kHz. No problem at 60 Hz. It remains to be seen if the wind can travel far enough at 60 Hz (between the corona wire and the body, essentially) to produce the thrust.
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Ion Lifter-- "Anti-Gravity"
