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Air taxi for intercity transportation

21.03.2020

The American company Transcend Air has begun developing the Vy 400 flying taxi; it is planned to be used for intercity flights.

The American company Transcend Air has begun to create an air taxi Vy 400, the N + 1 portal writes with reference to Aviation Week. The device is planned to be made according to the tiltrotor scheme with a rotary wing, with propellers at the ends, and a fan in the tail section. The car will be equipped with a turboshaft engine capable of delivering 1 horsepower. The maximum takeoff weight of the Vy 700 will be 400 tons; The air taxi will be able to carry cargo weighing up to 3,2 kilograms. The device will be able to fly at speeds up to 993 kilometers per hour, at an altitude of up to 648 meters.

It is planned that the Vy 400 will be able to carry up to five passengers. Transcend Air plans to use air taxis for long-distance travel, specifically between New York and Boston and Los Angeles and San Francisco.

The company has already begun testing scaled-down air taxi prototypes, as well as software and control systems for the vehicle.

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Topological insulators - the basis of lasers 15.02.2018

Researchers from Israel and the United States have worked out the concept of a laser, which includes analogues of topological insulators. These materials conduct electrons in only one direction, which makes transmission through them resistant to interference. For lasers, it was proposed to use similar structures that conduct photons. Calculations show that the energy efficiency of lasers with topological insulators will be several times higher than that of lasers based on "old" principles.

The surface of topological insulators is a very thin layer of highly conductive materials, and their core is made of dielectrics. They are two-dimensional and three-dimensional. For the laser model proposed by the authors of the articles under discussion, two-dimensional insulators were used, each of which consisted of a network of interlaced rings. Only the outer rings are conductive. If one or more of these rings fails, the flow of particles in the desired direction will not stop, and interference will not appear. Thanks to this, additional energy losses for conducting the beam can be avoided. And this means that less energy is required to supply beams of the same power to a laser based on topological insulators.

Another feature of lasers using the principle of topological insulators is that they do not need electromagnetic fields to work. This removes a number of restrictions on the use of such devices. And experiments with a prototype of a new type of laser confirmed the theoretical assumptions. The energy pumped into the outer row of rings of the topological insulator passed unidirectionally in the form of photons around the entire perimeter of this insulator and exited from another point in the form of a light beam.

The described lasers can be used in optics, as well as quantum networks. In addition, with their help, it is likely that it will be possible to create faster and more reliable electronics.

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