Principles of flight_chapter_5
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Principles of flight_chapter_5

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Gliding

Gliding

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Principles of flight_chapter_5 Principles of flight_chapter_5 Presentation Transcript

  • Principles of Flight Chapter 5 - Gliding
  • Forces on a Glider
    • Unlike a normal aircraft a glider has no engine i.e. no thrust.
    • So only 3 forces act on the Glider
    • Weight, Drag, Lift
  • Lift
    • Like a normal aircraft a glider has to generate lift it does this by moving through the air, falling slowly like a car coasting down hill
    • It must descend constantly to have lift
  • Gliding Angle and Distance
    • How far a glider travels depends on 2 things:
    • The Gliding angle – The angle at which it descends.
    • The Height/Distance ratio – Viking 1:15 so it will travel 15km for every km above the ground it is.
  • Effect of Wind
    • A Glider flying away from the wind (Downwind) will travel further.
    • A Glider Flying in to a 35kt wind at 35kts will appear to stay still in the air
    • A glider flying at 35kts away from the wind will appear to be flying at 70 kts
  • Airbrakes
    • Instead of flaps gliders use airbrakes.
    • Panels which pop out of the top of the wings.
    • To keep the same speed, the nose is put down increasing gliding angle
    • Allows the glider to land in smaller spaces.