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Principles of flight_chapter_1

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Lift & Weight

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Principles of flight_chapter_1

1. 1. Principles of Flight Chapter 1 – Lift and Weight
2. 2. Lift and Weight <ul><li>Issac Newton’s Law: Every Action has an equal and opposite reaction. </li></ul><ul><li>How can air support an aircraft </li></ul><ul><li>Air is a substance, so it exerts a force. </li></ul><ul><li>Blow between two pieces of paper, they get sucked together not blown apart </li></ul>
3. 3. Wind Tunnel Tests <ul><li>Air has to travel round the constriction (B) so it travels faster </li></ul><ul><li>As it is travelling faster the air pressure drops </li></ul><ul><li>Airspeed up and air pressure increases again at C </li></ul>
4. 4. Lift <ul><li>Blowing over a piece of paper lifts it up. </li></ul><ul><li>The pressure above is lower than below </li></ul><ul><li>This lifts the paper up. </li></ul><ul><li>The same applies for an aerofoil or wing. </li></ul>
5. 5. Lift <ul><li>As the wing is tilted up at the front it produced downwash </li></ul><ul><li>This adds to the lift </li></ul><ul><li>Lift is not distributed evenly </li></ul><ul><li>The most lift is generated at the most curved part. </li></ul>
6. 6. How Lift Varies <ul><li>Several Factors effect Lift: </li></ul><ul><li>A) Airspeed </li></ul><ul><li>B) Angle of Attack </li></ul><ul><li>C) Air Density </li></ul><ul><li>D) Wing Shape and Area </li></ul>
7. 7. Lift and Weight in Balance <ul><li>If Lift is greater that weight the aircraft climbs </li></ul><ul><li>If Lift is less than Weight the aircraft drops </li></ul><ul><li>If lift and weight are equal the aircraft stays level </li></ul>
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