Transcript SHPE Foundation Noche de Ciencias Hands
SHPE Foundation Online SHPE Jr. Member Activities
TeachEngineering Hands-on
Activity: *
Building Tetrahedral Kites
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SHPE Foundation Online SHPE Jr. Member Activities
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SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites
Reference Activity on TeachEngineering • • •
Learn about manufacturing systems by building (and flying) a kite!
Engineering focus: o
Manufacturing and Engineering Analysis
• Follow instructions to manufacture a kite and apply engineering analysis to evaluate the efficiency of the process.
Learning objectives: o Explain basic elements of flight.
o o Construct a tetrahedral kite.
Describe basic manufacturing systems and processes.
• • SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Suggested time:
75 minutes
Materials
o kite string o o o o o o o o 60 7¾ inch (~20 cm) straws 2-3 ft. streamers Kite Template & Instructions scotch tape or glue sticks 4 sheets of tissue paper 1 pipe cleaner scissors pencil
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Engineering Connection
(Real World Application): • From kite racing to hang-gliders, kites have come a long way in the past 2000 years. Then again, even with the information available to us today, kite design is a challenge due to the number of variables associated with it. • This activity focuses on the industrial engineering aspect bringing out the importance of efficient manufacturing processes. Delta kite Kite Flying by Suzuki Harunobu, 1766 (Metropolitan Museum of Art) Spinning kite
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites
Vocabulary Terms
drag lift gravity tension relative wind industrial engineering
Definitions
A frictional force acting on a body (as an airplane) moving through a fluid (as air) parallel and opposite to the direction of motion.
The component of the total aerodynamic force acting on an airplane or airfoil that is perpendicular to the relative wind and that for an airplane constitutes the upward force that opposes the pull of gravity.
A force of attraction between two objects due to the mass of the objects and the distance separating them.
Two pulling forces directly opposing each other that stretch an object. Tension in the string keeps a kite from flying away.
The airflow produced by the aircraft moving through the air. The relative wind is in a direction parallel with and opposite to the direction of flight.
A branch of engineering dealing with the optimization of complex processes or systems. It is concerned with the development, improvement, implementation and evaluation of integrated system. The term originally applied to manufacturing, but has grown to encompass any methodical or quantitative approach to being efficient in how a process, system or organization operates.
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites
Diagrams showing forces acting on a kite
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Introduction:
o
Kites
were the first flying devices ever made by humans. o o o The word "kite" comes from a bird in the hawk family known for its grace in the air. Kites come in a wide variety of shapes and sizes and have been used for many purposes throughout history, although today, kite flying is done largely for recreation. Recommended resources to learn more about kites, including history, how they fly and how to build a kite: • • • http://easyweb.easynet.co.uk/~s.stapleton/kites/build.html
http://www.asahi-net.or.jp/~et3m-tkkw/history-table.html
http://www.skratch-pad.com/kites/fly.html
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Introduction:
o o Do you know how a plane flies ? Believe it or not, it is all because of the unique shape of the airplane's wings !
Lift
is the force that opposes gravity, allowing a plane to fly. It’s a mechanical aerodynamic force produced by the motion of the airplane through the air.
• There are many explanations for how lift is generated, found in encyclopedias, in basic physics textbooks, and on Web sites. Unfortunately, many of the explanations are misleading and incorrect . • • Lift occurs when a moving flow of gas (air!) is turned by a solid object. The flow is turned in one direction, and the lift is generated in the opposite direction, according to
Newton's Third Law
based on
action and reaction
. Because air is a gas and the molecules are free to move about, any solid surface can deflect a flow. For an aircraft wing, both the upper and lower surfaces contribute to the flow turning. (Note: Neglecting the upper surface's part in turning the flow leads to an incorrect theory of lift.)
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Introduction:
o A little more information about
lift:
• Lift is generated by the difference in velocity between the solid object (plane and its wings) and the fluid (air). • • There must be motion between the object and the fluid. It makes no difference whether the object moves through a static (stationary) fluid, or the fluid moves past a static solid object. Lift acts perpendicular to the motion. Drag acts in the direction opposed to the motion.
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Introduction:
o In today's activity, you will apply this mechanism of flight to designing
tetrahedral kites
. o o o You will build a tetrahedral kite following a specific set of instructions and using specific provided materials. You will use basic processes found in many manufacturing systems - cutting, shaping, forming, conditioning, assembling, joining, finishing, and quality control - to manufacture a complete tetrahedral kite within a given time frame. Pay attention to the quality of the finished kite!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure Overview
• Use basic manufacturing processes to efficiently create a kite. The Kite Template & Instructions handout provides illustrations to help explain the steps in the Procedure; it is very helpful to look at the illustrations while following the steps below!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
Phase 1: Making Pyramids
1. Obtain six straws, measure and cut a 72" (182.88 cm) long piece of kite string. Thread 4 straws on the kite string. Hold on to the ends. Keep approximately 3" (7.62 cm) of string towards end A.
2. Arrange the straws onto a diamond shape and use the pipe cleaner "needle" to feed the string through the starter straw, so that it comes out between straw 1 and straw 2.
3. Add the fifth straw and place it across the center of the diamond.
4. Feed the "needle" back through the third straw so that it comes out between straw 2 and 3.
5. Add the sixth straw. Pull up the straws so that a triangle is formed. Tie it off so that your triangles form a stable pyramid shape. Now, using steps 1-5 make 9 more pyramids!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
Phase 2: Building the Kite
6. Using the template, carefully trace and cut out 20 tissue paper shapes.
7. Cover two sides of each pyramid with tissue paper. Fold the edges of the tissue paper around the straw and glue in place.
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
Phase 2: Building the Kite (continued)
8. Assemble the kite. • • • • • Begin with the bottom layer. Arrange three pyramids side by side so that they only touch by one corner and the front of each is a covered panel (all of the covered panels should lie in a plane). The other covered panel should be lying flat on the table. Knot the pyramids at the points where they meet. Arrange two pyramids behind those three so that the front covered panels of the two new pyramids faces the same direction as the front three. The back corners of the front three just meet the front corners of the two behind. Knot the two pyramids at all points that touch. Attach one more pyramid to the back corners of the row with two, again facing the covered panel forward. Be sure that all knots are secure!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
Phase 2: Building the Kite (continued)
9. Add the second layer of pyramids. • • • Arrange two pyramids side by side (make sure the covered panels are on the bottom and front). Knot them to each other. Align the bottom corners of these two with the peaks of the front five pyramids on the bottom layer. Knot these two pyramids to the bottom layer. Arrange and attach a third triangle behind the two you just attached. Be sure that all knots are secure!
10. Add the third and final layer. Attach a single pyramid on top of the second level still having the covered panel facing forward. The finished kite itself looks like a giant pyramid. Be sure that all knots are secure!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
Phase 2: Building the Kite (continued)
11. Attach kite strings to the corners where the front panel meets the back panel. With the strings here, the panels will face downward when in flight and the triangles will look like birds in flight.
12. Add a tail using the streamers to keep the kite properly oriented towards the wind.
Phase 3: Flying Your Kite
13. Check the knotting. Attach flying string. Go out and fly your kite!
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Procedure
• • • • •
Phase 4: Analysis of Manufacturing
Consider the following questions: How well did you work to build your kite? Were you efficient? Where was time wasted? What were the problems?
Did you follow the specific instructions and use the specified materials? Did you finish on time? How was the quality of the end product?
Describe all the basic manufacturing system processes you used (cutting, shaping, forming, conditioning, assembling, joining, finishing, and quality control).
What improvements would you make to the kite-making process?
What is industrial engineering? How is the kite-making you did today a type of industrial engineering?
SHPE Foundation Online SHPE Jr. Member Activities
Building Tetrahedral Kites Investigating Questions
o o o o How and why do objects (such as plane and kites) move upward against the force of gravity?
Why do kites fly?
How can a person, or group of people, most efficiently produce a finished product – the tetrahedral kite – using manufacturing processes?
How will modifications of the project's initial design alter the kite's performance?
Activity Extensions
o Alter the design and make a new kite. Test your new kite that follows your own design against the tetrahedral kite you made following the instructions. How do the kites compare in their performance?
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