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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
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