Wind is an important consideration for pilots before taking off and landing, but it may not only be for the reasons you’re thinking. Aircraft always try to land and take off into the wind in order to minimize the speeds needed to get airborne or come to a stop. Here’s a look a the role the wind plays.
Minimum takeoff speed
Now it might seem the opposite, but all aircraft try to fly against the wind when taking off. The reasons lie in the physics of reaction and aerodynamics. When taking off into the headwinds, the oncoming force on the wings causes an upward thrust, allowing the plane to actually become airborne at a lower speed.
This is due to Newton’s third law of motion, which states any force on an object will cause an equal force in the opposite direction. The additional force on the wing forces them up, allowing pilots to require less thrust on takeoff, saving time and fuel at this initial stage of flight.
Wind management is key for airports and airlines, with preflight calculations made with the wind in mind. Photo: Getty Images
The wind also creates a region of low pressure over the top surface of the wing due to the difference in design with the bottom, according to CNTraveler. This aerodynamic design means the low-pressure forces the wing upwards when headwinds are present, further reducing the takeoff speed needed.
Stay informed: Sign up for our daily and weekly aviation news digests.
However, after takeoff, pilots will try to move to a route that provides a tailwind, pushing the plane along its path rather than pushing it back throughout. Airports use years of climatology reports to plan their runway directions to ensure flights are able to get tailwinds as often as possible. This is why the N-S/E-W directions on runways are so important for aircraft.
What about landing
The same principle largely applies to planes returning to the ground as well. By landing into a headwind, the airframe is pushed back and slows down faster, allowing pilots to reach taxiing speeds much faster and without wearing out their brakes early. Moreover, the landing speed is also reduced, allowing for a safer entry onto the runway.
Planes use the same runway directions for takeoff and landing to maximize headwinds. Photo: Getty Images
Once the plane reaches taxi speed, it can quickly turn off the runway and onto the gate. If needed, airports can also reverse the direction of runways to match the prevailing winds. This happens more rarely since they can usually predict weather phenomena in advance but is open if required.
Not all wind is good
It’s important to note that while headwinds are useful at the start and end of flights and tailwinds during the cruise, not all winds are good. Crosswinds are a good example. These perpendicular winds cause the plane to lose balance, creating the violent scene seen in stormy landings. Overall, managing the wind is a delicate art for pilots and operations, and they always avoid trying to get blown away.
Did you know about how planes use winds to their advantage? Let us know in the comments!
Source: Conde Nast Traveler
Read Next
About The Author
