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Four Forces of Flight • Lift • Weight • Thrust • Drag Source: NASA Glen Research Center

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Four Forces of Flight. Lift Weight Thrust Drag. Source: NASA Glen Research Center. Forces on an Airplane. Lift. Lift is an aerodynamic force Lift must exceed weight for flight Generated by motion of aircraft through air Created by the effects of airflow past wing - PowerPoint PPT Presentation

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Page 1: Four Forces of Flight

Four Forces of Flight

• Lift• Weight• Thrust• Drag

Source: NASA Glen Research Center

Page 2: Four Forces of Flight

Forces on an Airplane

Page 3: Four Forces of Flight

Lift

• Lift is an aerodynamic force• Lift must exceed weight for flight• Generated by motion of aircraft through air• Created by the effects of airflow past wing• Aircraft lift acts through a single point

called the center of pressure.

Page 4: Four Forces of Flight

Weight

• Weight is not constant– varies with passengers, cargo, fuel load– decreases as fuel is consumed or payload off-

loaded• Direction is constant toward earth’s center• May be assumed concentrated at the center

of gravity

Page 5: Four Forces of Flight

Thrust

• Forward-acting force opposes drag• Direction of thrust depends on design• Propulsion systems produce thrust• Equal to drag in straight, constant speed

flight

Page 6: Four Forces of Flight

Drag

• An aerodynamic force• Resists forward motion• Two broad drag classifications

– Parasite drag: drag created by airplane design– Induced drag: by-product of lift generation

• Acts through the center of pressure

Page 7: Four Forces of Flight

What’s Missing?

Page 8: Four Forces of Flight
Page 9: Four Forces of Flight

CONTROL & PROPULSION

Page 10: Four Forces of Flight

Scientific Method

Page 11: Four Forces of Flight
Page 12: Four Forces of Flight

Think about what the world still needed before controlled flight

could become a reality


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