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Gliders and Flight

Gliders and Flight. David Wagner. Part I: Wing Design. Basic Aircraft Geometry. Wing Reference Area. Chord (c). Wingspan (b). Aspect Ratio. The 4 Forces of Flight. Lift. Thrust. Drag. Weight. The Glider Technique: Gravity as Thrust. Velocity Vector (Where the Plane is going).

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Gliders and Flight

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  1. Gliders and Flight • David Wagner

  2. Part I: Wing Design

  3. Basic Aircraft Geometry Wing Reference Area Chord (c) Wingspan (b) Aspect Ratio

  4. The 4 Forces of Flight Lift Thrust Drag Weight

  5. The Glider Technique: Gravity as Thrust Velocity Vector (Where the Plane is going)

  6. Optimizing Glider Flight & So,

  7. Optimizing Glider Flight (cont’d) Thus,

  8. Optimizing the Aspect Ratio

  9. Influence of Wingspan on Aspect Ratio Wing Reference Area: 0.5m 2

  10. Effects of Wingspan and Aspect Ratio on Wing Design Ideal Conditions: - Small Chord - Large Wingspan

  11. Part II: Stability and Egg Placement

  12. Stability and Control is the symbol for the centre of gravity of a body ALL motion of an airplane can be described as combinations of yaw, pitch and roll about theCG,

  13. Moments: The Seesaw Problem Student 2 Weight: 300N 6m Student 1 Weight: 600N 6m Without putting Student 1 on a crash diet, how would we balance the seesaw?

  14. Moments: The Seesaw Problem (cont’d) Student 1 Weight: 600N Student 2 Weight: 300N 3m 6m A “moment” is the tendency of a force to twist or rotate a body.

  15. Applying Moments to Glider Stability and Egg Placement 0.5m 0.5m Pos’n forward of CG Pos’n aft of CG Pos’n on CG

  16. Optimizing the Position of the Egg for Stability • Close to the CG to minimize impact • Extreme Cases: • Aft: Nose pitches up, aircraft stalls • Forward: Nose pitches down, aircraft nose dives

  17. Thank you, and good luck!

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