KITES

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K I T E S

DID YOU KNOW THAT KITES…..Originated in China about 3000 years

ago?Were outlawed during the 18th century

because they distracted shoe keepers from their duties?

Have been used to pull boats, carriages, sleds and ice skaters?

Have led to major scientific discoveries?

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K I T E S

FAMOUS DISCOVERIES WITH KITESIn the 15th century, Leonardo da Vinci

discovered how to use a kite to span a river

This method was later used in the construction of one of the world’s first suspension bridges in Niagara Falls, New York

Benjamin Franklin discovered electricity while flying a kite in 1752

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K I T E S

Avid kite flyers as children, Wilber and Orville Wright developed this love into the first successful airplane. In August of 1899, they built a biplane kite.

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K I T E S

FAMOUS DISCOVERIES WITH KITES

Bell developed the first tetrahedral kite.

In 1907 Bell’s kite flew for seven minutes and lofted a man 168 feet into the air.

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K I T E S

WHAT IS A KITE?

Kite Definition:A kite is an unpowered,

heavier-than-air flying device held to the earth by a line.

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K I T E S

WHAT ARE THE DIFFERENT PARTS OF A KITE?

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K I T E S

DIFFERENT TYPES OF KITES YOU CAN MAKE

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diamond

delta

box

cellular

Sky dancer

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dragon

stunt kite

parafoil

birds fish

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K I T E S

MATERIALS USED TO BUILD KITES

Most kite sails are nylon, polyester, paper, or plastic.

Most kite spars are wood, fiberglass, plastic, or carbon.

The best kite materials are lightweight and strong.

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K I T E S

HOW DOES A KITE FLY?

What forces are involved in flight?Lift Gravity DragTension

In order for the kite to fly, the upward lift force must be able to overcome the downward force of gravity.

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K I T E S

WHAT CREATES LIFT?• Wind is made up of particles (atoms)

which move from one direction to another.

• If the angle of the kite creates a difference in the airflow (moving atoms) over the top of the kite and the bottom of the kite a force known as "lift" is created

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K I T E S

WHAT CREATES THE LIFT FORCE?

Wind is split over the surface of the kite into two separate streams of air.

the air flow above the kite is fast, causing the pressure to be low

the air flow below the kite is slow, causing the pressure to be high

The high pressure below the kite creates lift

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Kite

This is known as Bernouilli’s Principle

Fast air flow

Slow air flow

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K I T E S

LIFT AND YOUR KITEThe amount of lift required to cause a kite to

rise depends on the overall weight of the kite in comparison to the surface area of its sail(s).

Lighter kites require less liftKites with a large surface area can create more lift

Conclusion: aim to make a light kite with a large surface area!

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SUMMARYWind : energyAirfoil: angle of kite causes splitting of air

molecules (wind) over the surface of the kite

Lift: lower air pressure on top than on bottom of kite

Drag: friction resistance on the kite

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KITE DESIGNAn effective kite design includes balance and

stability.The kite needs to be of equal weight on each side of it's center of balance

it needs to be carefully constructed to ensure that one side is not heavier than the other.

A longer tail will help to stabilize your kite by adding drag below the kite without adding too much weight. The tail will help keep the kite pointed into the wind.

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K I T E S

Kite flying moviehttp://www.grc.nasa.gov/WWW/K-12/airplane/

kiteprog.htmlhttp://www.sciencebuddies.org/science-fair-projects/project_ideas/Aero_p008.

shtml

Kite Modelerhttp://www.grc.nasa.gov/WWW/K-12/airplane/kiteprog.html

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