Glider Flight Test
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Glider Flight Test

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    Glider Flight Test Glider Flight Test Presentation Transcript

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