Flight Test Evaluation of Cherokee II Sailplane Tony Condon Aere 492 December 11, 2008
Cherokee II Sailplane <ul><li>Gottingen 549 Airfoil </li></ul><ul><li>40 ft wingspan </li></ul><ul><li>125 ft 2  wing area...
 
Objectives <ul><li>Determine Glide Polar </li></ul><ul><li>Determine actual performance </li></ul><ul><li>Compare to expec...
Calibrate Instruments <ul><li>Airspeed and Altimeter </li></ul><ul><ul><li>WWII Vintage </li></ul></ul><ul><li>Constructed...
Calibrate Instruments
Calibrate Instruments
Test Flight
Calculate Polar <ul><li>Determine Altitude change on each run </li></ul><ul><li>Time between start and finish </li></ul><u...
Calculate Polar
Calculate L/D
Compare
Polar Comparison
L/D Comparison
Find Aerodynamic Characteristics
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 ...
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><...
C L δ  vs Speed
C L  vs  α
C L  vs  α
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  ...
Process C D
C D  vs  α
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><...
C m δ  vs Speed
Future Work <ul><li>Better camera setup </li></ul><ul><li>Digital Level </li></ul><ul><li>More accurate stick position </l...
Questions?
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Glider Flight Test

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Glider Flight Test

  1. 1. Flight Test Evaluation of Cherokee II Sailplane Tony Condon Aere 492 December 11, 2008
  2. 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. 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>
  4. 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>
  5. 6. Calibrate Instruments
  6. 7. Calibrate Instruments
  7. 8. Test Flight
  8. 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>
  9. 10. Calculate Polar
  10. 11. Calculate L/D
  11. 12. Compare
  12. 13. Polar Comparison
  13. 14. L/D Comparison
  14. 15. Find Aerodynamic Characteristics
  15. 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>
  16. 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>
  17. 18. C L δ vs Speed
  18. 19. C L vs α
  19. 20. C L vs α
  20. 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>
  21. 22. Process C D
  22. 23. C D vs α
  23. 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>
  24. 25. C m δ vs Speed
  25. 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>
  26. 27. Questions?

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