OffbeatHow do planes fly?

15:07  03 november  2018
15:07  03 november  2018 Source:   popsci.com

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How do planes fly?© Victor Forgacs via Unsplash airplane flying against blue sky

It's pretty straightforward, really.

In 1903, Orville and Wilbur Wright flew the first plane in Kitty Hawk, North Carolina. Their plane looked quite different than the ones you fly today. It was made of wood and cloth, and there were no seats inside a cabin—the pilot, who was the only person on the plane, had to lie flat on the wing, completely out in the open! Luckily, that plane didn’t fly very high or far. Today, most planes are made out of metal, and passengers sit safely inside an enclosed cabin. Planes usually fly about seven miles high in the sky, and the biggest ones can reach halfway around the world! But despite the differences between the first plane and today’s modern ones, they both use the same science to fly. Here’s how they work.

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Flight relies on two principles of aerodynamics, or the study of how air moves around objects: thrust and lift.

Thrust is when an object is pushed forward with force. Planes use their jet engines to achieve thrust: the engines suck in air, compress it, mix it with gas, and ignite the mixture it in a burst of energy that shoots out the back of the engine, which pushes the plane forward. Jet engines produce so much thrust that planes can fly at extremely fast speeds of up to 600 miles per hour (mph)! That’s a lot faster than cars, which drive anywhere from 55 to 75 mph on highways.

Lift is the force that drives a plane upward and keeps it in the air. In order to produce lift, planes rely on their wings, which have a special shape called an airfoil. The top of the wing bulges out to create a smooth bump. When the wing moves through air, incoming air particles either go above or below it. Thanks to the bump, the air on top of the wing moves faster than the air on the bottom of the wing. These particle speeds create lower air pressure above the wing and higher air pressure underneath it—this concept is called Bernoulli's Principle. The high air pressure pushes the wing up, creating lift.

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How is a plane , which can weigh hundreds of thousands of pounds, able to escape the force of gravity to soar seemingly effortlessly through the sky? Arthur C. Clarke once famously said, "Any sufficiently advanced technology is indistinguishable from magic."

Thrust and lift are always fighting two other principles of aerodynamics: drag and gravity.

Drag is when a moving object blocks the flow of air, slowing the object down. You can feel drag if you put your hand out the window of a moving car—your arms get pushed backwards as the air rushes by. Planes need to have enough thrust to overcome the amount of drag it produces, so they’re designed to have air flow as smoothly as possible around the body (this is called being aerodynamic).

Gravity is the force that pulls all objects down toward the earth. Lift can overcome gravity if it is strong enough—the engineers who build planes do a series of equations to find the perfect wing size and flying speed to create the right amount of lift, based on the weight of the plane.

These combating forces mean planes have to fly at high speeds in order to stay in the air, which is just as well. When was the last time you wished a flight would last a little longer?

UFO over Ireland investigated after mid-air sightings.
The Irish Aviation Authority is investigating an unidentified flying object (UFO) after pilots reported seeing one off the coast of Ireland. Shannon Air Traffic Control received a call from a British Airways pilot flying from Montreal to Heathrow over County Kerry at 6.47am on 9 November.In an audio clip posted by LiveATC.net, the pilot can be heard asking if there were military exercises taking place within the craft's airspace at the time.She said the object came up alongside the plane before vanishing at "a very high speed"."Alongside you?" the Shannon Air Traffic Controller replied.

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