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Why Do Airplanes Have Swept Wings?

AME QUESTION PAPERby AME QUESTION PAPER
May 7, 2022
in Blogs
101
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If you look at commercial airplanes — as well as many privately owned airplanes — you’ll probably notice that most have swept wings. In other words, their wings don’t extend straight out from the sides. Instead, they angle backwards to form a V shape. Generally speaking, the faster an airplane is intended to fly, the greater the angle of its wing sweep. So, what’s the purpose of swept wings, and is it really necessary for commercial airplanes?

Swept Wings Are Longer Than Straight Wings

Using swept wings increases the total length of an airplane’s wings. If one airplane has swept wings, whereas a second airplane of the same type has straight wings, the former will have longer wings.  Swept wings are essentially longer than straight wings because they are angled backwards. And with longer wings, airplanes using swept wings perform differently than their straight-winged counterpart during flight.

Swept Wings Reduce Turbulence

The main reason airplanes have swept wings is to reduce turbulence. During flight, airplanes encounter turbulence from the friction created as air runs across the plane’s wings. The speed at which an airplane flies will affect the amount of turbulence is encounters. At faster speeds, airplanes encounter more turbulence due to the increased friction of the air running across its wings. In some cases, the air can travel faster than the speed of sound, resulting in heavily turbulence that’s not only a nuisance for passengers but also a danger to the aircraft’s structural integrity.

Swept wings, however, are designed to reduce turbulence by slowing down the air as it moves across the surface of the wings. As previously mentioned, swept wings are longer than straight wings. Therefore, air moves more slowly across them, which reduces the amount of turbulence the airplane encounters.

The concept of using swept wings to reduce turbulence was proposed at a conference in Germany during the 1930s. During the conference, Dr. Busemann explained that using swept wings could  counter the otherwise turbulent air encountered by airplanes flying at fast speeds. Since then, swept wings have become widely adopted and used in the commercial aviation industry.

Backward vs Forward Swept Wings

Most airplanes have backward swept wings, meaning their wings are angled backwards. But some airplanes have forward swept wings, meaning their wings are angled forwards. Forward swept wings such as this are used in slow-flying airplanes. Featuring a forward sweeping angle of about 10 to 60 degrees on average, this design helps to produce more lift, thereby improving the airplane’s fuel efficiency while reducing turbulence in the process.

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