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[QUOTE="AlephZero, post: 4657576, member: 63630"] It's a nice example of how far above an "aerofoil" (i.e. the mountain) the airflow is affected. Even in the UK, where the hills are mostly under 3000 ft, the gliding altitude record is over 38,000 feet, and flights to 10,000 feet are not particularly special. Records for the duration of flights are no longer accepted, because with modern equipment the main issue is how long the pilot can stay awake, rather than flying skill. Air density at high altitudes is not really a big deal for the glider (though it is for the pilot). The lift-to-drag ratio doesn't change much, so you just fly faster to get enough lift. In gliding flying competitions, the planes are usually loaded up to the [b]maximum[/b] permitted weight with sandbags for the same reason, which might seem counter-intuitive - you want to fly from one thermal to the next as fast as possible. [/QUOTE]
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