Make a "Whirly Bird" from Paper

Abstract

Objective

Build a paper "whirly bird" and see if adding weights makes it fall faster.

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Introduction

Have you ever seen a helicopter flying through the sky? How do they stay up in the air? Helicopters have to overcome gravity, which pulls them down toward Earth. They do this with spinning blades that generate lift, which helps keep them up in the air. As the blades spin, they have to overcome drag, or air resistance, which tries to slow them down.

Real helicopters have motors that make the blades spin. In this project, you will build a miniature paper helicopter, called a whirly bird,, like the one in Figure 1. The whirly bird does not have a motor, but because of its special shape, its blades will still spin when it falls. This helps generate lift and slows the whirly bird down. Do you think adding more weights (paper clips) to the whirly bird will make it fall faster? Try this project to find out!

Figure 1. A paper whirly bird.

Terms and Concepts

• Gravity
• Lift
• Drag

Questions

• How do helicopters stay up in the air?
• Will adding weights to your whirly bird make it fall faster?

Bibliography

• NASA. (2010, November 16). What Is a Helicopter?. Retrieved June 26, 2015, from https://www.nasa.gov/audience/forstudents/5-8/features/what-is-a-helicopter-58.html#.VY2CNkbzPH0
• Rader, A. (n.d.). Forces of Attraction. Retrieved June 26, 2015, from http://www.physics4kids.com/files/motion_gravity.html

For help creating graphs, try this website:

• National Center for Education Statistics, (n.d.). Create a Graph. Retrieved June 2, 2009, from http://nces.ed.gov/nceskids/createagraph/

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Materials and Equipment

• Computer with access to a printer to print the whirly bird template
  • Optional: If you do not have access to a printer, you can use a ruler and a piece of paper to draw your own whirly bird based on the online template
• Printer paper
• Scissors
• Paper clips (at least 3)
• Stopwatch
• Volunteer
• High place from which to drop the whirly birds. For example, you could get an adult to stand on a chair or a ladder. If possible, you can drop the whirly birds from a second floor window or balcony (on a calm day without too much wind), but only do this with adult supervision.
• Lab notebook

Experimental Procedure

1. Download the whirly bird template.
2. Print out the whirly bird template on a piece of printer paper. If you do not have access to a printer, use a pencil and ruler to draw the template outline on a blank piece of paper. Dimensions are given in the template file.
3. Follow the instructions on the template to cut out and fold your whirly bird. The finished whirly bird should look like the one from Figure 1 in the Introduction.
4. Draw a table like Table 1 in your lab notebook so you can use it to record your data.

5. Get your stopwatch and volunteer helper ready.
   1. One person should be in charge of dropping the whirly bird, and the other person should use the stopwatch. You will need to start the stopwatch as soon as the whirly bird is dropped, and stop it as soon as it hits the ground.
   2. You should drop the whirly bird from a high place. If possible, drop it from a second story window or balcony (but not on a windy day), or have an adult stand on a chair or ladder. Make sure you drop the whirly bird from the exact same height each time.
6. Drop the whirly bird and use the stopwatch to time how long it takes to hit the ground. Record this value in Table 1, in the box for "Trial 1" next to "0" paper clips.
7. Repeat step 6 two more times for your second and third trials. Record these values in your data table.
8. Now, add a paper clip to the bottom of your whirly bird, as shown in Figure 2.

Figure 2. A paper clip attached to the bottom of the whirly bird to add weight.

9. Repeat steps 6–7 with one paper clip. Remember to record your results in your data table, in the row for "1" paper clip.
10. Repeat steps 6–7 for two, three, and four paper clips. Make sure you record all of your results in the correct row in your data table. You should have three trials for each number of paper clips.
11. Ask an adult to help you calculate the average fall time for each number of paper clips. Record this value in the "Average" column in your data table.
    1. If you want to calculate the average yourself, you need to add up the values for each trial and then divide by three. For example, if your fall times for 0 paperclips were 6.0, 5.5, and 5.9 seconds, the average would be (6.0 + 5.5 + 5.9) ÷ 3 = 5.8 seconds.
12. Make a line graph with the number of paper clips on the x-axis (horizontal line) and the fall time in seconds on the y-axis (vertical line). Ask an adult or use the Create a Graph website if you need help making a graph.
13. Analyze your results. Did the whirly bird fall faster, slower, or stay the same as you added more paper clips? Is this what you thought would happen?

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Pilots fly airplanes, helicopters, and other aircraft to accomplish a variety of tasks. While the primary job of most pilots is to fly people and cargo from place to place, 20 percent of all pilots have more specialized jobs, like dropping fire retardant, seeds, or pesticides from the air, or helping law enforcement rescue and transport accident victims, and capture criminals. Pilots enjoy working and helping people in the "third dimension." Read more

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Variations

• Look up aerodynamic terms like angle of attack, aspect ratio, and chord length. What happens if you change these properties on the whirly bird design? Do an experiment where you change one of these variables and measure how it affects the fall time.
• What happens if you compare whirly birds made from different types of paper, such as thin notebook paper versus thicker cardstock?
• Try an engineering project where you design your own whirly bird, with the goal of making a whirly bird that falls as slowly as possible. Think about it like you are designing a tree seed—you want it to stay in the air as long as possible so it can be carried farther away by the wind. Look online for design ideas from tree seeds that have "wings" (search for "winged seed" or "autorotating seed").

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Related Links

• Science Fair Project Guide
• Other Ideas Like This
• Aerodynamics & Hydrodynamics Project Ideas
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