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# Principles of flight_chapter_5

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Gliding

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### Principles of flight_chapter_5

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