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Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
Glider Flight Test
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Glider Flight Test

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Transcript

  • 1. Flight Test Evaluation of Cherokee II Sailplane Tony Condon Aere 492 December 11, 2008
  • 2. Cherokee II Sailplane <ul><li>Gottingen 549 Airfoil </li></ul><ul><li>40 ft wingspan </li></ul><ul><li>125 ft 2 wing area </li></ul><ul><li>14.4 ft 2 tail area </li></ul><ul><li>2.5:1 taper ratio </li></ul><ul><li>600 lb weight </li></ul><ul><li>6.66 G ultimate load </li></ul>
  • 3. &nbsp;
  • 4. Objectives <ul><li>Determine Glide Polar </li></ul><ul><li>Determine actual performance </li></ul><ul><li>Compare to expected performance </li></ul><ul><li>Find Aerodynamic Characteristics </li></ul><ul><li>Find Stability Derivatives </li></ul>
  • 5. Calibrate Instruments <ul><li>Airspeed and Altimeter </li></ul><ul><ul><li>WWII Vintage </li></ul></ul><ul><li>Constructed Manometer to calibrate Airspeed </li></ul><ul><li>Used test set to calibrate Altimeter </li></ul>
  • 6. Calibrate Instruments
  • 7. Calibrate Instruments
  • 8. Test Flight
  • 9. Calculate Polar <ul><li>Determine Altitude change on each run </li></ul><ul><li>Time between start and finish </li></ul><ul><li>Calculate descent rate </li></ul><ul><li>Plot descent rate vs speed </li></ul><ul><li>Calculate L/D ratio at each speed </li></ul>
  • 10. Calculate Polar
  • 11. Calculate L/D
  • 12. Compare
  • 13. Polar Comparison
  • 14. L/D Comparison
  • 15. Find Aerodynamic Characteristics
  • 16. Process C L <ul><li>All variables known, find C L vs V </li></ul><ul><li>Know δ e vs V </li></ul><ul><li>Calculate C L α and C L δ </li></ul><ul><li>Take C L,0 from Lockheed code </li></ul><ul><li>Find C L vs. α </li></ul>
  • 17. Calculate C L α and C L δ <ul><li>Use pitch attitude and flight path angle change to find change in alpha </li></ul><ul><li>Use stick position measurements to find change in elevator angle </li></ul>
  • 18. C L δ vs Speed
  • 19. C L vs α
  • 20. C L vs α
  • 21. Process C D <ul><li>Know everything for Weight based C D </li></ul><ul><li>Use Minimum Sinking condition to find C D,0 , e </li></ul>
  • 22. Process C D
  • 23. C D vs α
  • 24. Process C m δ <ul><li>C m = 0, trim condition </li></ul><ul><li>Know C m,0 and C m α from Lockheed code </li></ul><ul><li>Know α and δ e for each speed </li></ul><ul><li>Find C m δ </li></ul>
  • 25. C m δ vs Speed
  • 26. Future Work <ul><li>Better camera setup </li></ul><ul><li>Digital Level </li></ul><ul><li>More accurate stick position </li></ul><ul><li>Automated processing </li></ul><ul><li>More glider types! </li></ul>
  • 27. Questions?

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