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  2. Klimov VK-2500 - Wikipedia

    en.wikipedia.org/wiki/Klimov_VK-2500

    Rated at 2,500 shp (1,864 kW) take-off power. Powers Mi-28NM. [2] VK-2500M Next generation derivative of VK-2500 under development by Klimov, with planned reduced fuel burn and weight. Rated at 2,600 shp (1,939 kW) for take-off and 2,200 shp (1,641 kW) continuous power. Deliveries planned by 2023. [4] TV3-117VMA-SB3 Ukrainian designation for VK ...

  3. Evaporative cooler - Wikipedia

    en.wikipedia.org/wiki/Evaporative_cooler

    An Egyptian qullah, set in drafts to cool interiors. Porous pottery and coarse cloth maximize the area for evaporation. An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water.

  4. History of radar - Wikipedia

    en.wikipedia.org/wiki/History_of_radar

    Watt, Superintendent of the RRS, was now well established as an authority in the field of radio, and in January 1935, Wimperis contacted him asking if radio might be used for such a device. After discussing this with his scientific assistant, Arnold F. 'Skip' Wilkins , Wilkins quickly produced a back-of-the-envelope calculation that showed the ...

  5. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    Which countries have natural fuel resources? Depends, what kind of fuel are you looking for. Almost all countries have some resources. - 131.211.210.14 13:54, 1 December 2005 (UTC) []