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Know All the Wright Angles
Activity Sheet #2
Key
| Directions: |
Use the graph below to help the AIAA pilots answer their questions.
This is a graph showing the data collected on the Flyer replica. It
displays the lift and the drag at different angles of attack of the
flyer for different Runs. |
- On the graph above, circle the point at which the most lift is being
generated.
- How many pounds of lift are being generated?
about 1050
- What is the angle of attack?
6°
- On the graph above, draw a box around the point at which the most
drag is being generated.
- How many pounds of drag are being generated?
200 lbs.
- What is the angle of attack?
6°
- Give the angle of attack at which 800 pounds of lift are being generated.
2°
- At which angle of attack does drag begin to steadily increase?
2°
- At which angle of attack does lift peak, and then begin to steadily
decrease?
The increase in lift appears to increase at a steady rate of about
150 pounds for each 2° increase in the angle of attack. Whereas
the increase in drag rises about 15-20 pounds for each 2° increase
in the angle of attack.
- What do you think is happening between 9 and 10 degrees angle of attack?
It appears that because the Flyer's lift increases at a rate greater
than drag, the Flyer's wings generate more than a sufficient amount
of lift at these angles of attack.
- A good cruise angle is one in which the design has the greatest difference
between lift and drag. Doing some subtraction, calculate which angle
of attack would most likely be the most efficient cruise angle?
(Hint: you don’t have to subtract the drag from lift of each angle of
attack. Narrow the field, by looking for the biggest gap between lift
and drag and then doing some subtraction.)
6° angle of attack ~ 1050 lbs. lift - ~ 200 lbs. drag = 850 lbs.
lift
4° angle of attack ~ 800 lbs. lift - ~ 150 lbs. drag = 650 lbs.
lift
- At which angle of attack does lift begin to steadily increase?
drag = ~215 lbs. or ~220 lbs.
lift = ~ 1150 lbs
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