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Research paper airplane

Jun 17, 2018

Key concepts
Aerodynamics
Planes
Forces
Drag
Physics

Introduction
Have you ever wondered what makes a paper plane fly? Some paper planes clearly fly better than others. But why is this? One factor is the kind of design used to build the plane. In this activity you'll get to build a paper plane and change its basic design to see how this affects its flight. There's a lot of cool science in this activity, such as how forces act on a plane so it can fly. So get ready to start folding!

Background
The forces that allow a paper plane to fly are the same ones that apply to real airplanes. A force is something that pushes or pulls on something else. When you throw a paper plane in the air, you are giving the plane a push to move forward. That push is a type of force called thrust. While the plane is flying forward, air moving over and under the wings is providing an upward lift force on the plane. At the same time, air pushing back against the plane is slowing it down, creating a drag force. The weight of the paper plane also affects its flight, as gravity pulls it down toward Earth. All of these forces (thrust, lift, drag and gravity) affect how well a given paper plane's voyage goes. In this activity you will increase how much drag a paper plane experiences and see if this changes how far the plane flies.

Materials
• Sheet of paper
• Ruler
• Scissors
• Large open area in which to fly a paper plane, such as a long hallway, school gym or basketball court. If you're flying your paper plane outside, such as in a field, try to do it when there isn't any wind.
• Something to make at least a one-foot-long line, such as a long string, another ruler, masking tape, rocks or sticks.
• Paper clips (optional)

Preparation
• Make a standard, "dart" design paper airplane (for instructions, go to the Amazing Paper Airplanes Web page ).
• Fold your paper into the basic dart paper plane. Fold carefully and make your folds as sharp as possible, such as by running a thumbnail or a ruler along each fold to crease it. Do not bend up the tailing edge of the wings (step 6 of the online folding instructions).
• Go to a large open area and, using string, a ruler, masking tape, rocks or sticks, make a line in front of you that's at least one foot long, going from left to right. This will be the starting line from which you'll fly the paper plane.

Procedure
• Place your toe on the line you prepared and throw the paper plane. Did it fly very far?
• Throw the plane at least four more times. Each time before you throw the plane, make sure it is still in good condition (that the folds and points are still sharp). When you toss it, place your toe on the line and try to launch the plane with a similar amount of force, including gripping it at the same spot. Did it go about the same distance each time?
• Once you have a good idea of about how far your plane typically flies, change the plane’s shape to increase how much drag it experiences. To do this, cut slits that are about one inch long right where either wing meets the middle ridge. Fold up the cut section on both wings so that each now has a one-inch-wide section at the end of the wing that is folded up, at about a 90-degree angle from the rest of the wing.
• Throw your modified paper plane at least five more times, just as you did before. How far does the paper plane fly now compared with before? Why do you think this is, and what does it have to do with drag?
Extra: Make paper planes that are different sizes and compare how well they fly. Do bigger planes fly farther?
Extra: Try making paper planes out of different types of paper, such as printer paper, construction paper and newspaper. Use the same design for each. Does one type of paper seem to work best for making paper planes? Does one type work the worst?
Extra: Some people like to add paper clips to their paper planes to make them fly better. Try adding a paper clip (or multiple paper clips) to different parts of your paper plane (such as the front, back, middle or wings) and then flying it. How does this affect the plane's flight? Does adding paper clips somewhere make its flight better or much worse?

Observations and results
Did the original plane fly the farthest? Did the plane with increased drag fly a much shorter distance?

As a paper plane moves through the air, the air pushes against the plane, slowing it down. This force is called drag. To think about drag, imagine you are in a moving car and you put your hand out the window. The force of the air pushing your hand back as you move forward is drag, also sometimes referred to as air resistance. In this activity you increased how much drag acted on the paper plane by making a one-inch-high vertical strip on both wings. For example, this is what happens when you're in a moving car with your hand out the window and you change its position from horizontal to vertical. When your hand is held out vertically, it catches a greater amount of air and experiences a greater drag than when it is horizontal. You could probably feel this, as your hand would be more forcefully pushed back as the car moves forward. This is what happened to the modified plane—it experienced a greater amount of drag, which pushed it back more than the original plane. This experiment has clearly demonstrated that altering how just one force acts on a paper plane can dramatically change how well it flies.

Cleanup
Recycle the paper plane when you are done with it.

More to explore
Dynamics of Flight: Forces of Flight, from NASA
What Makes Paper Airplanes Fly?, from Scholastic
Forces of Flight—Drag, from The Franklin Institute
How Far Will It Fly? Build and Test Various Paper Planes, from Science Buddies

This activity brought to you in partnership with Science Buddies
ScienceBuddies

NASA Meatball Image

Paper Airplanes

Glenn
Research
Center

Computer animation of two paper airplanes.

Paper Airplane #2 (PA-2) & Paper Airplane #1 (PA-1)

A glider is a special kind of aircraft that has no engine. In flight, a glider has three forces acting on it as compared to the four forces that act on a powered aircraft. Both types of aircraft are subjected to the forces of lift, drag, and weight. The powered aircraft has an engine that generates thrust, while the glider has no thrust.

There are many different types of glider aircraft. Paper airplanes are the simplest aircraft to build and fly, and students can learn the basics of aircraft motion by flying paper airplanes. Building and flying balsa wood or styrofoam gliders is an inexpensive way for students to have fun while learning the basics of aerodynamics. Hang-gliders are piloted aircraft that are launched by leaping off the side of a hill or by being towed aloft. Piloted gliders are launched by ground based catapults, or are towed aloft by a powered aircraft then cut free to glide for hours over many miles. The Wright Brothers perfected the design of the first airplane and gained piloting experience through a series of glider flights from 1900 to 1903. The Space Shuttle flies as a glider during reentry and landing; the rocket engines are used only during liftoff.

On the graphic at the top of this page, there are two paper airplane designs shown: Paper Airplane #1 (PA-1), in blue at the lower right, and Paper Airplane #2 (PA-2), in red at the upper left. Both of these aircraft are constructed by folding an 8 1/2 by 11 sheet of paper. The plans for these aircraft are provided below.

To obtain your own copy of PA-1 click here and save the Power Point file. Open Power Point and follow the directions written on the aircraft to obtain a two-sided copy of the plans from your printer. The plans will look like this:


Plans for PA-1 aircraft from the bottom.
Plans for PA-1 aircraft from the top.
To construct the aircraft, fold on the solid lines in the prescribed numerical order (1,2,3..) always folding to the inside. Cover the number with the fold. The dashed lines on the plans indicate places to cut with a scissors. The PA-1 is designed to be highly maneuverable and employs both ailerons and a rudder. If both ailerons are turned upward, the aircraft will loop. If one is turned up and the other down, and the rudder is fixed straight, the aircraft will roll. If the rudder is turned, the aircraft will perform a banked turn.

To obtain your own copy of PA-2 click here and save the Power Point file. Open Power Point and follow the directions written on the aircraft to obtain a two-sided copy of the plans from your printer. The plans will look like this:


Plans for PA-2 aircraft from the bottom.
Plans for PA-2 aircraft from the top.
To construct the aircraft, fold on the solid lines in the prescribed numerical order (1,2,3..) always folding to the inside. Cover the number with the fold. The PA-2 is designed to fly fast and far.

Students should build and fly both aircraft to learn how differences in design affect the flight performance of an aircraft. After experimenting with paper airplanes, the student is ready to move up to more challenging aircraft such as wooden or styrofoam gliders.

Activities:
Teamwork in Aerospace
Guided Tours

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I avoid looking forward or backward, and try to keep looking upward. Charlotte Bronte

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