Maxwell you devil....... 

Lifters don't work in a vacuum, so they are not anti-gravity, they clearly need the "air" to work which makes them similar to ion engines.


D.

What value is the particular line of reasoning that completely eliminates the value of something because it does not demonstrate to be useful or practical at this time?

Have you considered that the Lifters being a confirmed proof of concept,  could possibly be useful to something later on in time. Have you considered the possibility that it might develop into something practical in some variation, or combination of other discoveries that may end up being also just proof of concepts on their own which did not get linked up to this, because the experimenter said it was impractical to use, and used their reason to dump it in the bin, and thus that particular reason killed what may have otherwise had a chance to become a practical use in form?
Of course there may be things that may not ever work, but if everyone were to give a reason for not doing, we would not have had any progress, inventions, or much change at all.

I do not  know if it is true or how accurate is the reference by many people to  Thomas Edison having tested 10,000 materials and knew of 10,000 materials that were not a good a good material material to make a light bulb light up.
 He could have  given himself a reason to not  continue. " its a waste of time, this 9,999th material does not light up, and i can not use it or any other material. These experiments are useless.".
Thankfully though, he had an attitude with each experiment  was one part of the end result. I do not think the accuracy or truth of that reference is that important, because it illustrates some value in that we have reasoned to be worthless or no point in the immediate time.  If he focused on this material and that material as being worthless, or there is no point, would you even be reading what you are reading right now?

I saw the same show (MythBusters).
Their foil lifter took off on the bench rather quickly when power was applied (think it was only 30,000 volts rather than the 45,000 volts in the NASA video of the one that works), failed to do so when put under a vacuum.

Do you have a link to some evidence that they won't work in a vacuum? 
 

Yes. NASA tested the technology in high vacuum:
http://jnaudin.free.fr/lifters/ascvacuum/index.htm
Paul.

i dont belive this, because this 2 potentionals are not moving the device.
it must connected at 2 different devices , so that can push or attrac ...
Pese

I see not one that have work with the static field that was working with
+ and - potentential at the saucer

If you use pinking shears to serrate the bottom edge of the foil it will fly even better. (But it will draw a bit more current too--big surprise.)
At least mine did.
Like this:

\/\/\/\/\/\/\/\/\/\/\/\/\/\/

And mine did seem to fly better on one polarity, but I can't remember whether it was wire-positive and foil-negative, or the other way around.

And I don't believe that a Biefeld-Brown effect has been reliably demonstrated in vacuum. I know of experiments that went as high as 160 kV that should have detected a B_B effect had it been there. They didn't, so the conclusion is that the supposed B-B effect is actually due to ion wind.