the wright brothers master inventors. what are the four forces of flight? weight: planes are heavy;...
TRANSCRIPT
What are the four forces of flight? Weight: Planes are heavy; counteracted by lift Lift: The force that holds the plane up; the
wings Drag: The air that pushes against the moving
plane; counteracted by thrust Thrust: The force moving the plane forward;
the engine and propellers
So why are weight and drag important? Answer: They cause lift
The Wind Tunnel
The Wrights spent four years perfecting their airplane design with the help of a wind tunnel where they were able to see what was happening and make changes.
Replica of Wrights’ wind tunnel. The fan produced 25-35 mph winds.
What’s so remarkable?
Part of what made the Wright Brother’s plane so remarkable was the fact that it could be piloted
Interactive
Read pages 40 and 42
We’re done…So what is the test going to be like?
You will have a choice between taking the exam or building a wind tunnel
The wind tunnel has to be better than our class model and needs to come to school Mon, Oct 29
The wind tunnel and the exam are worth the same number of points
You can do both. If you do both, I will grade your exam and the wind tunnel will be extra credit
Either way, you HAVE to do the study guide. The study guide is its own assignment.
I know you have questions…
What happens if I make the wind tunnel and forget to bring it on Monday?
Answer: Then you’re taking the exam. Which one is easier? Answer: That depends entirely on the individual How many extra credit points will I get if I do both? Answer: Half of the exam What materials do I use to make the wind tunnel? Answer: You can use anything you’d like as long as
it is works
Hint #1: If your air vane has too large of holes, it won’t filter the air or make the air flow directional.
Air Vane
Hint #2: If your air vane isn’t deep enough, it won’t filter the air or make the air flow directional
Depth: How thick it is
What mistakes did we make?
The towel was too thick
That means the air
vane didn’t let enough air into the
wind tunnel
The straws have small holes to trap the air and they have depth = effective air vane
There is a viewing area. We used acrylic (thin plastic at Menards). You could use Saran Wrap
No gaps between fan and
cardboard