Beginner's
Guide to Propulsion
If so instructed by your teacher, print out a worksheet page for these problems. From the American Heritage Dictionary: propel: is defined as to cause to move or sustain in motion. The engine on an airplane or helicopter is called the propulsion system of the airplane or helicopter. Propulsion systems are governed by Newton's Third Law: |
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Rocket Propulsion: Thrust = Mass Flow x Velocity |
Jet Propulsion: Thrust = (Mass Flow x Velocity) + (Pressure x Exit Area) |
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Activity: Controlled Propulsion Experiment - Balloon A balloon provides a simple example of how a rocket engine works. The air trapped inside the balloon pushes out the open end, causing the balloon to move forward. The force of the air escaping is the "action"; the movement of the balloon forward is the "reaction" predicted by Newton's Third Law of Motion. The distance that a balloon will travel when restricted to a straight line is related to the amount of air trapped inside the balloon when it is released. Similarly, the distance a rocket will travel is related to the amount of fuel trapped inside the rocket engine and the properties of that fuel. This experiment will allow us to investigate how filling balloons with different amounts of air affect how far they will travel along a straight path. In order to do this, we need a few equations.... Volume of a sphere: (the amount of air in the sphere) Volume = 1/6 x PI x (Diameter)3 Circumference of a sphere: (how far around the sphere is ) Circumference = PI x Diameter Diameter, as computed from the Circumference: Diameter = Circumference/PI PI = 3.14 (a constant value) |
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Materials:
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Procedure:
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Curator: Tom.Benson@grc.nasa.gov Responsible Official: Kathy.Zona@grc.nasa.gov
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