Posts Tagged ‘John Von Radowitz’

Scientists Invent Ion-Driven ‘Star Trek’ Plane

November 23, 2018

This is a fascinating piece from yesterday’s I newspaper, for the 22nd November 2018. It reports that Dr. Steven Barrett and his team at MIT have built an airplane that flies through channeling air underneath its wings using electrically charged wires hung below them.

The article, by John von Radowitz, on page 13, reads

A revolutionary electronic aircraft propulsion system inspired by Star Trek has been tested on a working model for the first time.

The five-metre wingspan glider-like plane has no propellers, turbines or any other moving parts, and is completely silent.

Instead, an “ionic wind” of colliding electrically charged air molecules provides the thrust needed to make it fly.

In the tests, the battery-powered unmanned aircraft, that weighs just five pounds, managed sustained flights of 60m at an average height of just 0.47m.

But its inventors believe that, like the early experiments of the Wright brothers more than 100 years ago, such small beginnings will eventually transform the face of aviation.

In the near future, ion wind propulsion could be employed to power quiet drones, the team predicts.

Further down the line, the technology could be paired with more conventional propulsion systems to produce highly fuel-efficient hybrid passenger planes.

Lead researcher Dr. Steven Barret, from Massachusetts Institute of Technology (MIT) in the US, said: “This is the first-ever sustained flight of a plane with no moving parts in the propulsion system.

“This has potentially opened new and unexplored possibilities for aircraft which are quieter, mechanically simpler, and do not emit combustion emissions.”

He revealed that he was partly inspi9red by the TV sci-fi series Star Trek. He was especially impressed by the show’s futuristic shuttle crafts that skimmed through the air producing hardly any noise or exhaust. “This made me think, planes shouldn’t have propellers and turbines,” said Dr. Barrett.
“They should be more like the shuttles in
Star Trek that have just a blue glow and silently glide.

The test aircraft, described in the journal Nature, carries an array of thin wires strung beneath the front end of its wings. A high-voltage current passed through the wires strips negatively charged electrons from surrounding air molecules.

This produces a cloud of positively charged ionized air molecules that are attracted to another set of negatively charged wires at the back of the plane.

As they flow towards the negative charge, the ions collide millions of times with other air molecules, creating the thrust that pushes the aircraft forward.

The article also said that

Test flights were made across the gymnasium at MIT’s duPont Athletic Centre, the largest indoor space the scientists could find.

The article also carried this diagram of the aircraft and its engine.

The illustration is entitled ‘How It Works’, and shows picture of the plane, with an arrow saying ‘Battery in fuselage’. There’s also a diagram of the electrically charged particles and the wires connected to the battery that the plane uses instead of a conventional engine.

The illustration’s notes read

Thin wires are strung under the front of the wing and thicker wires under the rear. When connected to a high voltage battery they act as electrodes. The thin positive electrode takes negatively charged electrons from air molecules, creating positive ions. The ions are attracted to the negative electrode at the rear and, as they flow towards it, they collide with neutral air molecules, creating thrust.

The plane reminds of me of the atmospheric aircraft in one of Alistair Reynold’s SF novels, Revelation Space, which fly through heating up the air below them. The propulsion system’s also related to the nuclear electric propulsion used, or proposed, for some spacecraft. This also uses an electrically charged grating to channel and increase the thrust of charged particles generated by a nuclear reactor. As I understand it, the amount of thrust generated by this type of rocket engine is small, but because it’s constant it can eventually build up over time so that the craft is flying at quite considerable speed.

An ion-driven plane is a fascinating concept, though it won’t be powering passenger craft just yet. But you wonder how many UFO sightings will be generated by the experimental and prototype craft which will be designed and built after this.

Advertisements

Two ‘Super Earths’ Discovered around Nearby Star, Tau Ceti

August 10, 2017

Today’s I newspaper, for Thursday 10th August, has the news that two planets, which may be suitable for human colonization, have been found around Tau Ceti, a nearby star similar to our Sun.

The paper says on page 2

Astronomers have discovered two potentially habitable “super-Earths” orbiting a star 12 light years away. British led experts have identified four rocky planets, similar in size to Earth, in Tau Ceti’s “habitable zone” orbiting the nearest Sun-like solar system, neighbouring ours.

John Von Radowitz’s article, The Climate’s Nice 12 Light Years Away on page 5 also adds that the two ‘super-Earths’ are at the edge of Tau Ceti’s “habitable zone”, and that

British-led astronomers speculate that the system might be a potential candidate for future interstellar colonization. But there is evidence of a massive debris disc circling the star, increasing the chances of the planets being pounded by asteroids and comets.

Dr. Fabo Feng, the lead researcher from the university of Hertfordshire, said: “We’re getting tantalizingly close to observing the correct limits required for detecting Earth-like planets.

“Our detection…is a milestone in the search for Earth analogues and the understanding of the Earth’s habitability.”

The findings are to be published in ‘The Astronomical Journal’.

Philip’s Astronomy Encyclopedia (London: Philips’, 2002) states that Tau Ceti ‘is the most Sun-like of all the nearby single stars’. (‘Cetus’, p. 81), and that it is a G8-type star lying at a distance of 11.9 light years. This means its a yellow dwarf star like our Sun.

Tau Ceti is one of the stars making up the constellation Cetus, and is quite visible, unlike some of the other nearby stars, like Barnard’s Star. It’s so much like Sun that it was one of two stars, the other being Epsilon Eridani, which were the subject of Project Ozma in 1960. This was a program led by Frank Drake, using the 26 metre radio telescope at Green Bank to listen for possible signs of alien civilisations broadcasting messages along the 21 cm band. That wavelength was selected because it’s close to the wavelength occupied by the noise of cold hydrogen in space. Drake and his fellow scientists believed that it would therefore be a natural wavelength for advanced alien civilisations to use to broadcast to each other across the vast gulfs of space.

The search was, however, unsuccessful, and after a couple of months it was discontinued. Frank Drake still remains an influential figure in the Search for Extra-Terrestrial Intelligence (SETI) for his formulation of the Drake Equation, a formula which allows the number of possible alien civilisations in our Galaxy to be calculated.

The Equation has also come under attack. James E. Oberg, a NASA scientist, criticized it over thirty years ago in his article, ‘New Case Against Extraterrestrial Civilisations’ in the 1981 Yearbook of Astronomy. Part of the problem with the equation is that no-one actually knows how common Earthlike planets are, nor how likely the emergence of life is, and how like intelligent, technological life is either. According to the numbers selected, the Equation gives an answer for the number of alien civilisations in our Galaxy as anywhere from several to several million. I have a feeling Carl Sagan, one of the greatest advocates of the search for alien life, believed that there may have been around a thousand or so extraterrestrial civilisations out there in our Galaxy.

Astronomers have since found many tens, if not actually hundreds of extra-solar planets since then, some of which are rocky worlds like our own. This is very encouraging for SETI advocates and researchers, but later projects to search the sky using radio telescopes have still not found any conclusive evidence of alien intelligence.

As for missions to neighbouring stars, the costs of constructing a suitable spaceship that will get there in decades, rather than centuries or millennia, is immense. However, it has been estimated that the global economy should have grown sufficiently to make such a mission affordable by the 22nd Century A.D. Always supposing that Donald Trump and Kim Jong Un haven’t destroyed the world before then.