Airliner in shark skin. Free Technical Library News

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Airliner in shark skin

08.12.2010

Already half a century ago, zoologists have established that microscopic bumps, depressions and grooves on the skin of a shark reduce the turbulence of the water flow around the fish and allow the shark to develop high speed with little effort.

The Bremen Institute of Machining Technology and Applied Materials Science (Germany) has created a formula for a special lacquer that, when cured, imitates the texture of shark skin. Films with such a microrelief are produced that can be glued to the fuselage of an aircraft or ship's hull, reducing the resistance of the environment and fuel consumption. But it is difficult to fix the film on the surface of a complex shape, namely the surface of the wings and fuselage of a modern aircraft.

The varnish, which includes special nanoparticles, acquires the desired surface structure when solidified. It is easy to apply to a metal case of any shape. They are offered to cover the blades of wind turbines, as air resistance reduces their efficiency.

The varnish is durable and withstands temperatures from minus 55 to plus 70 degrees Celsius. If the entire world fleet of airliners is provided with such coverage, the annual fuel savings will be 4,5 million tons.

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TE Connectivity IHVA150 and IHVA200 DC Contactors 28.07.2021

The new IHVA150 and IHVA200 DC contactors from TE Connectivity are an innovative solution to meet today's high demands for electric vehicles, electric charging stations, energy storage systems and other high voltage applications.

A distinctive feature of the IHVA series is the elimination of the gas design in order to increase the reliability, performance and overall safety of the use of the contactor. IHVA contactors use an arc extinguishing system that achieves electrical durability of 6000 cycles at 150 A, 110 V DC (IHVA150) and 5000 cycles at 200 A, 110 V DC (IHVA200).

IHVA contactors are available in two versions of the contact group: normally open (version A) and normally open with an auxiliary contact (version H), which performs the function of indicating the state of the main contact.

Other benefits of the IHVA series include:

Support for non-polar connection for more convenient and faster installation;
Extended air gap/creepage distance: 14/25mm;
Additional circuit protection due to inrush current 600A;
cULus E58304, UL 60947, CCC compliant.

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