11iFLY | INDOOR SKYDIVING Copyright © 2018 iFLY Holdings, Inc.

The Science & Engineering of iFLY

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STEM is fun!

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STEM is used in the real world to solve problems and improve lives.

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Exciting futures in STEM await you.

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This is a Closed

Loop Vertical

Wind Tunnel.

350 HP fanX2350 HP fanX2

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Wind tunnel

testing

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Fluids

vs.

Solids

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Air

is a

fluid.

By Georgepehli (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

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Fluids exert pressure forces

Static air pressure

Dynamic air pressure

By yeowatzup from Katlenburg-Lindau, Germany (Sleeping Cat, Commonwealth, Singapore) CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

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gravity

pulling you down

force of air

pushing you up

force of air

pushing you up

gravity

pulling you down

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gravity

force of air force of air

gravity

When drag force = gravity, you reach terminal velocity.

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A smaller

frontal area

increases

your velocity.

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A smaller

frontal area

increases

your velocity.

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A larger

frontal area

decreases

your velocity.

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How fast

does the air have

to move

to support

your weight ?

Engineers and scientists use mathematics to quantify physical principles…because…

we want to be able to predict what’s going to happen.

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Now lets go flying!

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Additional Slides

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The experiment plan: predict your terminal velocity

𝑣 =2𝑚𝑔

𝐴𝑓𝐶𝐷𝜌

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Drag coefficients for simple objects

What would you guess the drag coefficient of

your body is in free flight?

CD

Cylinder

Flat plate

Sphere

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Fluids also have viscosity, which produces friction forces

Which type of fluid has the higher

viscosity, liquids or gases?

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Drag is the combination of friction and pressure forces

Which kind of drag do you think is more important for air flows?

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How do we know the air speed?

…with a Pitot Static Tube.

Can you find them in our wind tunnel?

…we measure it…

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Drag of an object depends on its shape, its size, and the velocity of the air stream

Shape:

2929iFLY | INDOOR SKYDIVING Copyright © 2018 iFLY Holdings, Inc.

The Science & Engineering of iFLY