Ionic thrusters use high voltage to ionize air and create an airflow, which in the right configuation can create thrust with no moving parts. I've tried an experiment like the above, and barely generated enough lift to raise a little balsa and aluminum foil off a table, but MIT says they can do far better.

From The Verge:

Stealth drones and other aircraft of the future could be powered by engines that don't have any moving parts, can't be detected by infrared, and are more efficient than what we have today. A new study by MIT researchers demonstrated all of these capacities and more for ionic thrusters and now at least one major aerospace company, Lockheed Martin, has said it's investigating the technology.

"I think UAVs would be the most likely initial application if [ionic thrusters] work," said the lead researcher in the study, MIT aerospace professor Steven Barrett, in an email to The Verge. Ionic thrusters for aircraft work by generating a high-voltage electrical field that strips electrons from air molecules, "ionizing" them and pushing them away behind an aircraft as ionic wind, to move the craft forward. Scientists and hobbyists have been tinkering with small, lightweight model planes using these kinds of propulsion systems since the 1960s. The technology uses no moving parts and is almost completely silent. It hasn't come to full-size planes, though, due to power concerns.

But scientists at MIT's department of aeronautics have built a working prototype (pictured above) that suggests the technology is more feasible than previously assumed, generating far more thrust (110 newtons per kilowatt of power) than a comparable jet engine (2 newtons per kilowatt). "You could imagine all sorts of military or security benefits to having a silent propulsion system with no infrared signature," said Steven Barrett, the lead author of the study published today in the journal Proceedings of the Royal Society. Indeed, Lockheed Martin is already expressing an interest, with an executive telling MIT News "there are still unanswered questions, but because they seem so efficient, it’s definitely worth investigating further."

Barrett told The Verge there are still major hurdles to overcome before aircraft ionic thrusters are able to be commercialized, namely a large enough power supply for their electrical field, and a way to retain efficiency at higher speeds. "At reasonable flight speeds [about 560 miles per hour] the efficiency does decrease, but still looks promising," he wrote in an email. Also, because it uses air molecules, "this kind of propulsion only works in an atmosphere," Barrett said. "It need not be the Earth's atmosphere though – for example, it could be useful in exploration of other planets where fully electric propulsion without moving parts may be beneficial."

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Comment by Rana on April 3, 2013 at 5:47pm
Comment by Darren on April 3, 2013 at 6:08pm
Comment by John Hestness on April 3, 2013 at 8:13pm

Fifty times the efficiency of a turbine?  Am I missing something or is this a typo?

Comment by Pierre V on April 3, 2013 at 9:52pm

Not really new. See here

Comment by SirPent on April 3, 2013 at 9:53pm

Not enough power.....not even close......I think the part your missing is while it can be super efficient if you look at power use to thrust ratio, the article does not mention the equipment required to generate the electrical power weights quite a bit. compare that to the stored energy in fuel and i think your all important power to weight ratio in a turbine it much greater. not that i am an expert but that's my understanding of how an ion thrust works

Comment by John Arne Birkeland on April 4, 2013 at 2:45am

In other words, you quad becomes a simple design with no moving parts. But you need a truck to haul the diesel generator and electromagnetic death-ray device...

Comment by John Arne Birkeland on April 4, 2013 at 4:02am

This reminded me of an old blog post about using electrostatic for leveling.

Comment by Joshua Johnson on April 4, 2013 at 4:43am

I still want to see a tesla coil powered quad! :) I guess I'll have to wait...

Comment by Jethro Hazelhurst on April 4, 2013 at 9:14am

Allot of interesting work has been done on this subject . And indeed the power to thrust ratio is phenomenally good... simply because there is a direct conversion of energy.  I wish there was more discussion about ionic propulsion.

I think that with the advent of graphene super capacitors this will become a viable solution. I find the application to winged aircraft particularly interesting. By essentially turning the lifter into an aero foil with the high tension wire on the leading edge and charging the wing with very high voltages (depending on scale) you could have a super efficient UAV.

HV Power supplies an be made quite light.

Comment by Gary McCray on April 4, 2013 at 9:42am

Don't take this out of context, but it is intriguing that many of the characteristics attributed to the classic UFO sightings would actually seem to make considerably more sense in view of this technology than they did at the time they were made.

Just Saying. 


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