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Why can't helicopters go on Everest?

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A group of people estimated in the hundreds remains stranded on the slopes of Mount Everest following the earthquake that struck Nepal on Saturday. Their way back down from higher camps to base camp has been blocked by damage to the route. read more

Source: qz.com

The air at such high altitudes is very very thin (approximately atleast 8 times thinner). In such thin air the blades of a helicopter cannot cut the air to push the helicopter forward. read more

Helicopters create lift by their rotor blades pushing an equal mass of air downwards. The air pressure at the top of Mt Everest (29,000ft) is only about 1/3 as much as at sealevel so your helicopter can only generate 1/3 of the lift. read more

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Why helicopters haven’t evacuated everyone from Mount ...
Source: qz.com