The first ever “solid state” plane, with no moving parts in its propulsion system, has successfully flown for a distance of 60 metres, proving that heavier-than-air flight is possible without jets or propellers.
The flight represents a breakthrough in “ionic wind” technology, which uses a powerful electric field to generate charged nitrogen ions, which are then expelled from the back of the aircraft, generating thrust.
Steven Barrett, an aeronautics professor at MIT and the lead author of the study published in the journal Nature, said the inspiration for the project came straight from the science fiction of his childhood.
“I was a big fan of Star Trek, and at that point I thought that the future looked like it should be planes that fly silently, with no moving parts – and maybe have a blue glow.
“But certainly no propellers or turbines or anything like that. So I started looking into what physics might make flight with no moving parts possible, and came across a concept known as the ionic wind, with was first investigated in the 1920s.
“This didn’t make much progress in that time. It was looked at again in the 1950s, and researchers concluded that it couldn’t work for aeroplanes.
“But I started looking into this and went through a period of about five years, working with a series of graduate students to improve fundamental understanding of how you could reduce ionic winds efficiently, and how that could be optimised.”
How the world’s first solid-state aircraft used ‘ionic wind’ to fly
In the prototype plane, wires at the leading edge of the wing have 600 watts of electrical power pumped through them at 40,000 volts.
This is enough to induce “electron cascades”, ultimately charging air molecules near the wire.
Those charged molecules then flow along the electrical field towards a second wire at the back of the wing, bumping into neutral air molecules on the way, and imparting energy to them.
Those neutral air molecules then stream out of the back of the plane, providing thrust.
The end result is a propulsion system that is entirely electrically powered, almost silent, and with a thrust-to-power ratio comparable to that achieved by conventional systems such as jet engines.
The successful flight of the plane – which has no name beyond the uninspiring “Version Two” – owes as much to the engineering prowess required to make it as thin and light as possible as it does to the propulsion method itself.
The plane weighs just 2.45kg, but manages to fit in a five-metre wingspan, battery stack, and a high-voltage power converter.
In the longer term, the ability to power flight purely through electricity opens up the possibility of carbon-neutral flight, which could lower the emissions of the aviation industry globally.
Please like, share and tweet this article.
Pass it on: Popular Science