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Know All the Angles
Activity Sheet #2
Key
| Directions: |
Use the graph below to help Martin Northrop answer his questions.
This is a graph showing the data collected on Martin’s glider. It
displays the lift and the drag at different angles of attack when
the glider is flying at 45 feet per second. |
- On the graph above, circle the point at which the most lift is being
generated.
- How many pounds of lift are being generated? 4.80
- What is the angle of attack? 9 degrees
- 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? 2.00
- What is the angle of attack? 12 degrees
- List the 4 angles of attack during which the same amount of drag is
being generated.
- At which angle of attack does drag begin to steadily increase?
- At which angle of attack does lift peak, and then begin to steadily
decrease?
- What do you think is happening between 9 and 10 degrees angle of attack?
The stall angle has been reached and lift is not being generated
as greatly as before.
- 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.)
Somewhere between 8 and 9 degrees
- At which angle of attack does lift begin to steadily increase?
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