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Principles of Flight: Understanding Lift and Weight

Explore the fundamental concepts of lift and weight in aircraft flight, including Newton's law, air support, wind tunnel tests, lift generation, and factors affecting lift variation.

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Principles of Flight: Understanding Lift and Weight

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  1. Principles of Flight Chapter 1 – Lift and Weight

  2. Lift and Weight • Issac Newton’s Law: Every Action has an equal and opposite reaction. • How can air support an aircraft • Air is a substance, so it exerts a force. • Blow between two pieces of paper, they get sucked together not blown apart

  3. Wind Tunnel Tests • Air has to travel round the constriction (B) so it travels faster • As it is travelling faster the air pressure drops • Airspeed up and air pressure increases again at C

  4. Lift • Blowing over a piece of paper lifts it up. • The pressure above is lower than below • This lifts the paper up. • The same applies for an aerofoil or wing.

  5. Lift • As the wing is tilted up at the front it produced downwash • This adds to the lift • Lift is not distributed evenly • The most lift is generated at the most curved part.

  6. How Lift Varies • Several Factors effect Lift: • A) Airspeed • B) Angle of Attack • C) Air Density • D) Wing Shape and Area

  7. Lift and Weight in Balance • If Lift is greater that weight the aircraft climbs • If Lift is less than Weight the aircraft drops • If lift and weight are equal the aircraft stays level

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