Multicopter is a multi-rotor electric helicopter. Free Technical Library News

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Multicopter - multi-rotor electric helicopter

17.07.2012

So a group of German engineers called their creation - a multi-rotor electric helicopter. On the first test with a pilot, the car weighing 80 kilograms took off the ground for a minute and a half. A charge of lithium batteries should be enough for 10-20 minutes of flight.

Sixteen screws (each with its own electric motor) are controlled by a computer. The silver ball on which the pilot sits is an inflatable ball-shock absorber that flattens upon landing. The possibility of replacing the batteries with an electric generator with a gasoline engine is being considered.

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Home warmth - almost for free 26.10.2004

In just one day, American defense workers assembled a two-story cottage, the heating and cooling of which will cost 45 cents a day.

Scientists from the Oak Ridge National Laboratory of the US Department of Energy have developed a project for a house with almost zero energy consumption and even put it into practice in the form of a two-story cottage for a resident of Lenoir City, Tennessee. The house has taken all measures to protect the premises from uncontrolled heat and air exchange with the environment, as well as to utilize free energy such as Earth's heat or solar radiation.

The first floor of the house and the foundation are built from ready-made concrete blocks with thermal insulation, the second floor - from heat-insulating panels. In addition, the roof and walls are painted with "cold" paint, which reflects infrared rays, protecting the house from overheating. For heating, a water heater is used, built on the principle of a heat pump; in it, heat from a cold volume is transferred to a warmer one at the expense of energy consumption. At the same time, the energy spent on the transfer ultimately also goes to heating.

Additional sources of energy are geothermal heat, as well as a solar panel connected to the city's power grid. For air exchange in the house, adjustable mechanical ventilation is arranged; it is so well designed that the air quality matches that of a wooden house. When all the details are done in advance, the installation of the house takes very little time: the concrete first floor is erected in six hours, the second, from panels, in five, and the roof in three hours.

This house is worth a hundred thousand dollars. For heating and cooling, the owner will spend only 45 cents a day, while a cottage of this size in this city requires from 4 to 5 dollars.

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