What Are the Four Forces of Flight?
Every flying thing is balanced by four forces. Lift, weight, thrust, and drag all push and pull at once. Birds, bees, and kites follow the same four rules!
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What Is Lift, and Where Does It Come From?
Lift is the upward push on a wing. Without it, nothing heavier than air could fly. Where does it come from? A jumbo jet's wings make enough lift to hold up hundreds of tons.
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How Does the Shape of a Wing Help It Climb?
A wing is not just a flat board. Its special shape helps it climb into the sky. The shape is called an airfoil! A paper plane with a flat wing can still fly because it tilts up slightly.
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What Is Thrust, and How Do Planes Get It?
Thrust is the force that moves a plane forward. Without it, a plane would just sit on the runway. How do planes get it? Some small planes are powered by electric motors.
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What Is Drag, the Force That Slows Things Down?
Drag is the force that slows things down. You feel it when you push against a strong wind. Let's learn how to beat it! Doubling your speed makes drag about four times larger.
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How Does Weight Pull on Every Flyer?
Weight is Earth's gravity pulling on everything. Even things that fly must deal with it. A hummingbird weighs less than a nickel coin.
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What Is the Angle of Attack?
A wing can be tilted up a little compared with the air. That tilt is called the angle of attack. It changes how much lift you get!
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What Is a Stall, and How Do Pilots Handle It?
A stall sounds scary. But it has nothing to do with the engine stopping. Pilots know exactly what to do! Birds also stall when they land, and they use it to slow down.
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Why Do Planes Need to Go Fast Before They Can Take Off?
A plane cannot just jump into the sky. It has to roll down the runway first. It needs to get going fast! A big jet may use more than two miles of runway on a hot, heavy day.
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Why Do Airplanes Take Off Facing Into the Wind?
Pilots love taking off and landing into the wind. It might seem backward. But wind helps a plane fly! Airport wind socks show pilots which way the wind is blowing.
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Does a Wing Really Push Air Downward to Go Up?
Does a wing really push air downward to go up? Yes, it does! It all comes down to a famous rule of science. A helicopter hovering above water makes a spray of downward-blown air.
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How Are Lift and Weight Balanced in Level Flight?
When a plane flies straight and level, all the forces balance. Lift matches weight, and thrust matches drag. But the balance keeps changing a little!
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What Happens to the Four Forces During Takeoff, Cruising, and Landing?
A flight has three big parts. Take-off, cruising, and landing. The four forces change in each one! A landing jet touches down at about one hundred fifty miles per hour.
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How Do Ailerons Help a Plane Roll and Turn?
A plane can roll to the left or right in the sky. Little flaps on the wings make that happen. They are called ailerons! Ailerons always move in opposite directions on the two wings.
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What Do the Rudder and Elevator at the Tail Do?
The tail of a plane is not just for looks. It has two important controls. Each one steers in a different direction! Many small planes have rudder pedals that pilots push with their feet.
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What Are Pitch, Roll, and Yaw?
A plane can turn in three different ways. They have funny names. Pitch, roll, and yaw! Drones and spacecraft also use pitch, roll, and yaw.
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Why Does a Plane Tilt to the Side When It Turns?
Have you noticed a plane tilts when it turns? It leans into the curve like a bike rider. There is a good reason! Passengers usually feel only a gentle push into their seats during turns.
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Why Do Some Planes Have Curved-Up Wingtips?
Look closely at some airliners' wingtips. They curve up into little fins. They are called winglets! Winglets can save airlines millions of gallons of fuel a year.
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Why Do Big, Heavy Flyers Need Big Wings?
Heavy flyers need big wings. A swan has much larger wings than a sparrow. Lift depends on wing area! The largest flying bird alive by wingspan is the wandering albatross, with wings up to eleven feet across.
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Can a Plane Fly Upside Down?
Can a plane fly upside down? You might think it could not. But stunt pilots do it all the time! Some stunt planes roll all the way around in about a second.
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Why Do Jets Cruise So High Up Where the Air Is Thin?
Jets cruise way up high, where the air is thin. They fly higher than most clouds. It is a smart place to fly! Outside a jet at cruising height, the air temperature is around minus sixty degrees Fahrenheit.
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How Do Wind Tunnels Help Engineers Test Wings?
How do engineers test new wings before building a plane? They use a giant tube with a fan. It is called a wind tunnel! Some wind tunnels are big enough to hold a whole real airplane.
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Why Do Airplane Wings Bend Upward in Flight?
In flight, an airplane's wings bend upward. It might look scary, but it is by design. Wings are made to flex! Engineers bend test wings far beyond anything flight would ever ask of them.
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What Did the Wright Brothers Discover About Flight?
Orville and Wilbur Wright were bicycle makers. They had a big dream about flying. And they made it happen! The first flight was shorter than the wingspan of a modern jumbo jet.
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How Do the Four Forces Explain a Bird, a Plane, and a Kite?
A bird, a plane, and a kite all stay in the air. They look so different. But the same four forces explain them all! Even a falling maple seed spins to make its own lift.
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How Do Feathers Turn a Bird's Wing Into a Flying Machine?
A bird's wing is covered in feathers. They turn a wing into a flying machine. A bird's flight feathers can be replaced one at a time as they wear out.
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Why Do Some Birds Flap Constantly While Others Soar?
Some birds flap and flap. Others glide for hours on still wings. What makes the difference? Some seabirds can go for hours without flapping once they are up in the air.
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How Do Light, Hollow Bones Help Birds Fly?
Birds need to be light to fly. Many of their bones are hollow! Even though they are hollow, some bird bones are stronger for their weight than bones in most mammals.
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How Do Birds Land So Gracefully?
Birds land on a tiny branch with perfect balance. It looks so easy. But it takes real skill! A good landing is a skill that young birds learn by practice.
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What Do a Bird's Tail Feathers Do in the Air?
A bird's tail is like a steering wheel with feathers. It acts like a rudder and an elevator at once. A peacock's long tail is for show and does not help it fly.
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How Does a Heavy Swan Get Off the Water and Into the Air?
A swan is one of the heaviest flying birds. Getting into the air is a big job for it. It needs a long running start! A mute swan can weigh as much as a small dog.
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What Is a Thermal, and How Do Hawks Ride One?
Hawks and vultures circle high in the sky without flapping. They are riding invisible elevators. They are called thermals! Gliders and hang-glider pilots also use thermals.
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How Can an Albatross Cross an Ocean with Hardly Any Flapping?
An albatross can cross an entire ocean. It hardly flaps its wings at all. It uses a clever wind trick! Some albatrosses spend years at sea without touching land.
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Why Can Ostriches and Penguins Not Fly?
Ostriches and penguins are birds. But neither one can fly. Why not? An ostrich can run about forty-five miles per hour. Penguin wings work like flippers.
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How Can an Insect Beat Its Wings Hundreds of Times Each Second?
A honeybee beats its wings hundreds of times each second. How can any muscle move so fast? The secret is in the muscles! A hummingbird's wings beat about fifty times a second, much slower than an insect's.
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How Does an Insect's Chest Work Like a Wing-Wiggling Box?
Here is a surprise about insect wings. The muscles that move them are not in the wings. They are in the chest! A fly's thorax is like a springy box that helps save energy as it flaps.
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How Do Bumblebees Fly When People Once Said They Could Not?
There is an old story about bumblebees. It says scientists once decided they could not fly. But bees fly just fine! A bumblebee flaps its wings about two hundred times a second.
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How Is a Bat's Wing Different From a Bird's Wing?
A bat's wing is very different from a bird's wing. It has no feathers at all. It is made of stretchy skin! There are more than fourteen hundred kinds of bats.
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What Is the Difference Between Flying and Gliding for an Animal?
Some animals fly and some animals glide. They are not the same thing. Some gliding frogs have webbed feet that act as parachutes. Flying squirrels only glide.
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Can Snakes and Frogs Glide Through the Air?
Snakes and frogs can glide through the air! It sounds like a tall tale. But it is true! A flying snake can glide the length of a tennis court or more.
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How Do Dandelion Seeds Sail on a Breath of Wind?
A dandelion seed sails away on a puff of wind. It looks like a tiny parachute. Dandelion seeds can travel more than a mile on the wind.
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How Do Baby Birds Learn to Fly?
Baby birds are born without the ability to fly. They have to learn. Let's watch how they do it! A baby bird's first flight might last only a few seconds.
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Can Any Bird Sleep While Flying?
Could a bird sleep while it is flying? It sounds impossible. But some birds can do it! Common swifts can stay in the air for many months without landing.
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How Does a Feather Stay Light, Strong, and Smooth?
A feather is light, strong, and smooth all at once. How does it do that? It zips itself together! A bird can have thousands of feathers on its body.
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How Far Can a Bird Fly Without Stopping?
Which bird can fly the farthest without stopping? The record is almost unbelievable. It belongs to a bird called the bar-tailed godwit!
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How Do Birds Change the Shape of Their Wings?
A bird can change the shape of its wings in the air. It can bend, fold, and fan them. That gives it amazing control! Eagles spread the feathers at their wingtips like fingers when they soar.
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Why Do Some Birds Have Long, Pointed Wings and Others Short, Round Ones?
Some birds have long, pointed wings. Others have short, round ones. Each shape fits a way of life! Birds that live in thick forests often have shorter wings than those in open sky.
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How Do Baby Spiders Fly on Silk Threads?
Baby spiders can fly! They do it without any wings. They use silk threads! Charles Darwin noticed spiders landing on his ship while it was far from land.
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Why Can't People Fly by Flapping Wings Tied to Their Arms?
Why can't people flap wings tied to their arms and fly? Birds do it all the time. The answer is in the muscles! Pedal-powered aircraft have crossed the English Channel, but they need huge, light wings.
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What Can Engineers Learn From Flying Animals?
Flying animals have had millions of years to practice. Engineers watch and learn from them. Nature is a great teacher! The shape of some fast trains copies a kingfisher's beak.
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How Does a Jet Engine Work?
A jet engine follows four simple steps. Suck, squeeze, bang, blow! Let's go through them one by one. Parts of a jet engine run hotter than the melting point of their metal, so cool air flows over them.
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What Does the Huge Fan at the Front of a Jet Engine Do?
The front of a jet engine has a huge fan. It looks like a giant propeller in a tube. What does it do? The fan on the biggest engines is wider than a small airplane's body.
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What Do All the Dials in a Cockpit Tell the Pilots?
A cockpit is full of dials and screens. Each one gives pilots important information. Modern cockpits have big screens that combine many dials in one.
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How Does an Altimeter Know How High a Plane Is?
How does an airplane know how high it is? It feels the air! The tool is called an altimeter. Air pressure drops by about half at eighteen thousand feet.
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How Does a Plane Know How Fast the Air Is Flowing Past It?
How does a plane know how fast air is flowing past it? It uses a thin tube sticking out the front. It is called a pitot tube! Pitot tubes are named for Henri Pitot, a French scientist who invented the idea in the seventeen hundreds.
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What Is an Artificial Horizon, and Why Do Pilots Need It?
In clouds or at night, a pilot cannot see the real horizon. It is easy to lose track of which way is up. An instrument helps! A spinning gyroscope tends to keep pointing the same way.
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What Does an Autopilot Do?
An autopilot is a computer that can fly a plane along a set path. It does not replace the pilots. It is more like a helper! Autopilots were first used in the nineteen tens.
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Why Do Planes Fold Their Wheels Up After Takeoff?
After take-off, planes fold their wheels up. They disappear into the body of the plane. There is a smart reason! Some small planes keep their wheels down all the time.
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Why Is the "Black Box" on an Airplane Actually Orange?
Airplanes have a special recorder called a black box. Strangely, it is not black at all. It is bright orange! Flight recorders are placed in the tail, where they are best protected.
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What Makes the White Trails That Jets Leave Behind?
Jets sometimes leave long white trails in the sky. They look like clouds made by a plane. And that is almost what they are! Long-lasting contrails can turn into wispy clouds.
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Why Do Airplane Windows Have Round Corners and a Tiny Hole?
Airplane windows have round corners. They also have a tiny hole. Both are clever safety ideas! Airplane windows have several layers of plastic for strength.
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How Does a Plane Keep the Air Comfortable at 35,000 Feet?
Outside a jet at 35,000 feet, the air is thin and freezing. Inside, passengers breathe easily. How does the plane do that? The cabin air is replaced many times every hour.
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What Is Turbulence, and Why Does It Happen?
Sometimes a plane shakes in the sky. The seat belt light goes on. That bumpiness is called turbulence! The jet stream can cause bumpy air at high altitude, even in clear skies.
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Why Do Flight Attendants Ask for Tray Tables and Seats to Be Upright?
Flight attendants ask everyone to put tray tables away and seats upright. It happens at takeoff and landing. There is a good reason!
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Why Are Most Airplanes Painted White?
Look at most airplanes. They are white! Why not bright colors? Some airplane paints are made to resist ultraviolet light and very low temperatures.
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What Are the Panels That Pop Up on the Wings After Landing?
After landing, panels pop up on the wings. They look like little flaps standing up. What are they doing? Spoilers can be raised on just one wing to help a plane roll.
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How Do Airplanes Slow Down So Fast After They Land?
A landing plane rushes down the runway. Then it slows down quickly. It uses several tools at once! A big jet can stop from 150 miles per hour in about a mile of runway.
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What Is an Airplane Made Of?
An airplane must be strong, but also light. What do engineers use? Almost half of a Boeing 787 is made of composite materials. Composites are made of layers of fibers.
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How Many Parts Does a Jumbo Jet Have?
A jumbo jet is a giant puzzle. How many pieces does it have? The number may surprise you! A jumbo jet has hundreds of miles of wiring inside it.
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How Do Planes Get Cleared of Ice in Winter?
In winter, ice can form on a plane's wings. That is dangerous. So crews have a way to remove it! De-icing fluid is often orange or green so crews can see where it has been sprayed.
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What Happens When Lightning Strikes an Airplane?
Lightning can strike an airplane. That sounds scary! But planes are built for it. Planes have little wicks on their wings to let static electricity slip away.
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Where Does an Airplane Carry Its Fuel?
A big jet burns lots of fuel. Where does it keep it all? Mostly in the wings! Jet fuel is a type of kerosene. Big jets hold tens of thousands of gallons.
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Where Do Suitcases and Cargo Ride on an Airplane?
Where do suitcases go on a plane? They ride below your feet! Large cargo planes can carry heavy things like helicopters. Each bag has a tag for its trip.
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How Can a Plane Land Safely in Thick Fog?
Fog can hide the runway completely. Can a plane still land? Yes, with special instruments! Pilots have special rules about how low they can go without seeing the runway.
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How Can a Floatplane Take Off From a Lake?
Some airplanes take off from a lake. They do not have wheels! They have floats. Floatplanes can reach remote spots with no roads. Some floatplanes have wheels and floats.
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What Makes a Helium Balloon Float Up While a Regular Balloon Sinks?
A helium balloon floats up. A balloon you blow up yourself sinks. What is the difference? Helium is the second lightest element in the universe, after hydrogen.
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Why Does Helium Change the Sound of a Voice?
Helium makes the voice squeaky. It sounds funny! But why does it change? Sound goes slower in heavy gases, which can make voices deeper.
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What Do the Burner and the Top Vent Do During a Balloon Ride?
A hot air balloon has a burner and a vent. One makes it go up. One brings it down. A hot air balloon's top can be hotter than boiling water.
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How Can a Balloonist Pick a Direction Without a Steering Wheel?
A balloon has no steering wheel. How does the pilot choose where to go? By finding the right wind! Balloon races are won by pilots who find the best winds.
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When Did People First Fly in a Balloon?
Long ago, people only dreamed of flying. Then some clever brothers built a balloon. And people finally flew! Their balloon was decorated with bright paintings.
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What Makes a Blimp Different From a Drifting Balloon?
A balloon drifts with the wind. A blimp can go where the pilot wants. What is the difference? A big blimp can stay aloft for many hours.
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Why Do Airships Use Helium Instead of Hydrogen?
Hydrogen is lighter than helium. So why do airships use helium? Safety! Hydrogen is also the fuel of the Sun. Hydrogen can catch fire easily.
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Why Does a Weather Balloon Swell as It Rises, and Then Pop?
A weather balloon starts small. As it rises, it swells. Then it pops! Weather balloons are launched twice a day from sites all over the world.
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How Do the Spinning Blades of a Helicopter Make Lift?
A helicopter has spinning blades. They do not push it like a fan. They are tiny wings! Helicopter blades are called rotors. They often bend slightly in flight.
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Why Does a Helicopter Have a Little Propeller on Its Tail?
Look at the tail of a helicopter. There is a little propeller! What is it for? The Chinook helicopter has two big rotors, one at the front and one at the back.
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How Does a Helicopter Lean to Fly Forward?
A helicopter leans to go forward. The pilot tilts the whole spinning rotor. A special control does it. The cyclic control is like a joystick between the pilot's knees.
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Why Can a Helicopter Fly Sideways and Backward?
A plane cannot fly backward. But a helicopter can! How is that possible? Some helicopters can even turn in place while hovering. Hovering means staying in one spot.
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What Happens If a Helicopter's Engine Stops?
What if a helicopter's engine stops? Pilots train for this. There is a clever safety trick! Helicopter pilots practice autorotation landings with an instructor as part of their training.
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What Jobs Do Helicopters Do?
Helicopters can land almost anywhere. That makes them great helpers. What jobs do they do? Some rescue helicopters can lift a person from a boat using a winch.
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How Do Paragliders Stay Up in the Air?
A paraglider has no engine. Just a soft wing and the air. How does it stay up? Paragliders can climb thousands of feet in strong thermals.
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How Can a Sailplane Glide for Hundreds of Miles?
A sailplane has no engine. Yet it can fly hundreds of miles! How does it keep going? Some sailplanes can travel fifty feet forward for every foot they drop.
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What Is a Glide Ratio?
How far can a plane glide? There is a number that tells you. It is called the glide ratio. A jet at cruising height could glide more than a hundred miles if its engines stopped.
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How Does a Boomerang Come Back?
Throw a boomerang and it comes back! That seems like magic. But it is physics. Boomerangs come in many shapes, and not all of them come back.
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What Is the Difference Between Lighter-Than-Air and Heavier-Than-Air Flight?
Some things fly because they are lighter than air. Others are heavier but still fly. Two big ideas in flight! Some modern designs mix both ideas in a hybrid airship.
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What Are Electric Air Taxis?
Imagine a quiet flying taxi over a city. Some are being tested right now. They are electric air taxis! Air taxis are sometimes called eVTOLs.
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Can a Plane Fly Using Only Sunshine?
Can a plane fly with no fuel? Yes! A solar plane flew around the world. One pilot flew at a time and sometimes stayed up for several days.
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How Do Stunt Pilots Do Loops and Rolls?
At airshows, planes loop and roll. Those are stunt planes. How do the pilots do it? Stunt pilots feel forces several times their own weight in tight turns.
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How Do Firefighting Planes Scoop Up Water From a Lake?
Some planes fight forest fires. They scoop up water without landing. Wow! Water bombers are made in Canada. They use two small scoops.
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Can a Plane Fly on Human Leg Power?
Could you fly by pedaling? Someone really did it! Across the English Channel. Its wings stretched about ninety-six feet. That is longer than two school buses parked end to end.
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How Do Bush Planes Land on Short, Bumpy Strips?
Some places have no airports. Bush planes can land on gravel, snow, or water. How do they manage? This kind of flying is called STOL, short for short takeoff and landing.
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How Do People Learn to Become Pilots?
Every pilot started as a beginner. They learned step by step. Here is how. Many places let people take their first flying lessons as teenagers.
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What Is a Flight Simulator?
Pilots practice in a machine that never leaves the ground. It feels like flying! It is called a flight simulator. Astronauts also train in simulators.
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What Do Pilots Check Before They Take Off?
Pilots do not just jump in and go. They check lots of things first. Surgeons, astronauts, and mountain climbers use checklists too.
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Why Do Airports Scan Bags with X-Rays?
At the airport, your bag rides through a scanner. It sees inside without opening it! How? Doctors use X-rays to take pictures of bones.
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Why Do Pilots Say "Alpha, Bravo, Charlie" When They Talk on the Radio?
Pilots say funny words like Alpha, Bravo, and Charlie. They are not just being silly. It keeps flights safe. Many jobs use this alphabet, including ships and police.
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What Does an Air Traffic Controller Do?
The sky is busy with planes. Someone has to keep them apart. Meet the air traffic controller! Controllers often handle many planes at the same time.
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Why Does an Airport Have a Tall Control Tower?
Every big airport has a tall tower. It has big windows at the top. Why so high? Some small airports have towers only during certain hours.
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How Do Planes Stay Safely Apart in a Crowded Sky?
Thousands of planes fly each day. How do they never bump? Layers of safety! Planes going east and west usually fly at different heights.
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How Does Radar See Airplanes?
Radar can see a plane far away. It does not use eyes. It listens for echoes! Radio waves travel at the speed of light. An echo is a sound that bounces back.
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How Do Pilots Find Their Way Across an Ocean?
Over an ocean there are no signs. Pilots cannot see any roads. So how do they find their way? Some planes also use a spinning gyroscope system to know how they have moved.
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Why Do Flight Paths Look Curved on a Flat Map?
Earth is round like a ball. The shortest path is a great circle. On a flat map that path looks bent! Earth is a round globe, not a flat sheet.
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Why Do Runways Have Numbers?
Every runway has a number. That number is a direction clue. It tells pilots which way the runway points! Runway numbers come from compass degrees.
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What Do the Lines and Lights on a Runway Mean?
Runways have lines and lights. They work like road signs for pilots. Colors and shapes tell them where to go! White stripes mark the ends of a runway.
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Why Do Airports Have So Many Different Kinds of Vehicles?
Airports are busy places. Many special vehicles help each plane. Every truck has one important job! Fuel trucks fill the tanks. Baggage carts and belt loaders move suitcases.
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Why Does a Tug Push an Airplane Away From the Gate?
A jet at the gate faces the building. It cannot safely back up alone. A strong tug pushes it out! At the gate, a jet usually faces the building.
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How Long Does It Take to Get a Plane Ready Between Flights?
Planes do not rest for long. A turnaround can take under an hour. Teamwork makes it happen fast! A quick turnaround can take as little as 30 to 60 minutes.
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Why Does a Flight From Toronto to London Take Less Time than the Trip Back?
Winds high above Earth are super fast. Going east can feel like a push. Coming west pushes against you! The jet stream usually blows from west to east.
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What Is Jet Lag?
Your body has a clock inside. Flying far can confuse that clock. That mixed-up feeling is jet lag! Your body has an internal clock for sleep and wake.
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How Far Can You See From a Plane Window?
A plane window view feels huge. The ground shrinks into tiny shapes. On a clear day you can see for miles! From 35,000 feet, you can see over 200 miles to the horizon on a clear day.
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How Many Planes Are in the Sky at Once?
The sky looks empty from the ground. But many planes share the air at once. Trackers turn them into moving dots! At a busy moment, thousands of airliners are flying around the world.
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How Do Airports Keep Birds Away From Runways?
Birds and planes should not share a runway. Airports use many gentle ways to keep birds away. That protects birds and passengers! Short grass makes birds move on.
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Why Does a Puff of Smoke Appear When a Plane Lands?
When a plane lands, you may see a puff of smoke. The wheels were not spinning yet. Friction makes a tiny bit of rubber wear off! The smoke is tiny bits of rubber.
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What Are Some of the Biggest Airplanes Ever Built?
Some airplanes are truly huge. One carries hundreds of people on two decks. Another has wings longer than a football field! The A380 can carry hundreds of people.
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How Did Concorde Cross the Atlantic in About Three Hours?
Concorde crossed the Atlantic in about three hours. It flew faster than the speed of sound. That is about twice as fast as ordinary jets!
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How Are New Airplanes Tested Before They Carry People?
New airplanes face years of tough tests. Engineers push them harder than real flights will. Only then may they carry people! Testing can take years.
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Which Paper Plane Designs Fly the Farthest, and Why?
Paper planes come in two main styles. Darts are fast and pointed. Gliders float on wide wings! Darts fly fast and straight. Gliders float slowly and gently.
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How Do You Test a Paper Plane Fairly?
A fair test changes only one thing. Everything else stays the same. Many tries beat one lucky throw! One-change tests are called controlled experiments.
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What Happens When You Put a Paper Clip on the Tail of a Plane?
Balance decides how a paper plane glides. A clip on the nose can steady it. A clip on the tail can make it wobble! A nose clip moves balance forward.
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Why Do Paper Planes Fly Steadier When Their Wings Tilt Up Into a Shallow V?
Wings tilted up in a shallow V help a plane stay steady. If it rolls, the low wing gets more lift. That swing rights the plane! Dihedral means wings tilt up like a shallow V.
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How Can Small Bends in the Back of the Wings Stop a Plane From Diving?
Tiny bends at the back of the wings can fix a dive. They work like elevators on a real airplane. Pilots call this trimming! Bend up to raise the nose.
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Why Does a Paper Helicopter Spin as It Falls?
A paper helicopter falls and spins. Its flaps face opposite ways. So why does that make it twirl? A real maple seed spins down in the same way.
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Do Bigger Wings Always Fly Better?
Bigger wings make more lift. But they also add weight and drag. So do bigger wings always win? Airliner wings are long and thin for long glides.
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What Do the Tail and String of a Kite Do?
A kite has a tail and a string. They look simple, but they matter. What jobs do they do? A longer tail adds more drag and steadiness.
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Where Is It Safe to Fly a Kite?
Kites need lots of open sky. Some places are dangerous. So where is it safe to fly? Stay far from power lines, because a kite string can carry electricity.
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What Makes a Diamond Kite Fly Well?
A diamond kite looks simple. Two sticks and light cover. So what makes it fly so well? People have flown diamond kites for thousands of years in places like China.
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What Is Special About a Box Kite?
A box kite looks like boxes in the sky. It has more sides than a flat kite. So what makes it special? Two open boxes, or cells, help a box kite stay very stable.
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How Do Stunt Kites Use Two Strings to Steer?
Some kites have two strings. One in each hand. How do they steer so fast? Pulling the left line turns the kite left. Pulling the right line turns the kite right.
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How Can a Twisted Rubber Band Power a Tiny Airplane?
A tiny plane has no battery. Just a twisted rubber band. So how does that power flight? Rubber-band planes were popular long before batteries were small enough for toys.
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How Can You Tell Which Way the Wind Is Blowing?
Wind can be hard to see. But you can still find its path. How can you tell which way it blows? Flags, ribbons, smoke, or tall grass lean to show the wind.
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Why Does a Feather Fall More Slowly than a Coin?
Drop a feather and a coin. The feather drifts, the coin zooms. Why is one so much slower? In a vacuum or on the Moon, a feather and a coin fall at the same speed.
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Why Do Phones Need Airplane Mode on a Plane?
Phones talk to towers with radio signals. On a plane, those signals can cause trouble. So we switch on airplane mode! Airplane mode saves battery, too.
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Why Must Everyone Stay Far From a Spinning Propeller or a Running Jet Engine?
Propellers and jet engines are very powerful. They can be dangerous up close. So everyone stays far away! Ground workers wear ear protection near jets.
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Why Is Flying One of the Safest Ways to Travel?
Flying is one of the safest ways to travel. That is no accident. Planes have many layers of safety! Mile for mile, airline travel is far safer than traveling by car.
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What Jobs Help Planes Fly Besides Pilots?
Pilots fly the plane. But they never work alone. A whole team helps every flight! A single flight can involve hundreds of people. Baggage handlers load the bags.
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How Do Mechanics Keep Planes in Top Shape?
Planes fly many hours every day. They need lots of care. Mechanics keep them in top shape! Some big checks take weeks. The plane is taken apart piece by piece.
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Can a Balloon on a String Show How Thrust Works?
A fan blows air one way. Put it on a toy cart. The cart rolls the other way! A push on the air makes an equal push on the fan in the other direction.
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How Can You Graph the Results of Your Flight Tests?
You tested your paper planes. Now you have lots of numbers. A graph turns them into a picture! The first graphs were drawn more than two hundred years ago.
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Why Can a Ring-Shaped Straw Glider Fly?
A glider made from a straw and two paper rings? It does not look like a plane. But it really flies! Ring wings have been used in some real flying toys.
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