Question: I am a student pilot and I moved out of state so I had to change instructors. I swear my old instructor taught me to take off with a tailwind following the pointy end of the windsock. My new instructor says that’s backward. As I understand it you have to reach a certain airspeed before you can take off. Wouldn’t having a tailwind assist that? What are you supposed to do when the windsock indicates dead calm?
Answer: I think something got lost in translation here. Taking off into the wind allows the aircraft to reach liftoff speed at a lower ground speed. That wind on the nose helps this process. This reduces the takeoff distance and gets the aircraft into the air quicker and provides better performance.
Taking off with a tailwind does the opposite. The aircraft has to reach a higher ground speed to reach liftoff speed, and will have poorer performance. Depending on the length of the runway, you can run out of runway and options at the same time. Landing with a tailwind also produces poor performance.
As far as which runway to use, check the FAA Airport Chart Supplement for details. Some airports have preferred calm wind runways (usually due to noise abatement), and there are even some with “one-way runways.” These are usually due to obstacles on the approach and departure ends of the runway.
As far as how to read the windsock, think of it this way: On takeoff and landing, airplanes fly out of the mouth (big part) of the sock.
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