How is the speed of a plane calculated when it’s on its cruising altitude?
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At least on the small planes I’ve flown, many years ago. it’s through what’s called a pitot tube. It’s an L-shaped tube that comes down from the wing and points forward in the direction of travel, and as the air flows past the wing the pitot tube captures some of that airflow and measures the speed. If the pitot tube freezes and air can’t get in, then your airspeed indicator on the instrument panel will not function.
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