SSA Convention 04, Eta Biter presentation by Dick Butler

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  • 1. ASW22DB (ETA BITER) Evolution Feb98 to Jun03
  • 2. Project Phases
    • Phase I - Build ASW22BL with 30% Less Horizontal Tail Area
    • Phase II - Modify HQ17 Airfoil Inboard Wing
    • Phase III - New Vertical Stabilizer and Retractable tail wheel
    • Phase IV - New Outboard Airfoil Profile, Span Increase to 28m, Internal Air Flow Improvement
  • 3. Anticipated Performance Gains From Project Phases
    • 9% Performance Gain at Best L/D
    • 11% Performance Gain at High Speeds, (160km/hr)
    • Improved Climb Performance From Reduced Span Loading
    • Equal flying qualities with 28m Span by Maintaining Vertical Tail Volume Coeff. (V/S.b)
  • 4. Phase I - Build ASW22BL With Smaller Horizontal Stabilizer
    • 2.6% Less profile drag relative to wing
    • Good stability/elevator authority on tow & low speed flight (Minimum pilot wt. 88kg)
  • 5. Phase II - Modify HQ 17 Airfoil
    • Prof. Loek Boermans Designs Modification to HQ17 Airfoil Lower Surface for 7.5% Less Skin Friction Drag at High Speeds (6.0 percent relative to wing).
  • 6. Momentum Rake Installation
  • 7. Flight Test Verify Theoretical Calculations
  • 8. Blowing Articulation
        • Blow Holes at 72%
        • Blowing Set as a Function of Flap Position
        • NACA Ducts Opened & Closed by Servos Mounted Over Plenum
  • 9. Delft HQ17M Airfoil Design Was Implemented and Flight Tested
  • 10. Phase III - New Vertical Stabilizer & Retract Tail Wheel
    • Reasons For Building -Drag reduction with modern profile -Maintain 22BL tail volume coefficient(V/S.b) with 28m span (add 30cm tail boom, 10cm span) -Center hinged rudder -Drag reduction with retract tail wheel
    • Benefits - 25% Less profile drag - 2.2% Less drag relative to wing - Better handling from new profile and center hinged rudder
  • 11. Vertical Stabilizer Construction
  • 12. Tail Boom Construction
  • 13. Stabilizer Alignment
  • 14. Vertical Stabilizer Construction
  • 15. Perspective
  • 16. Phase IV - New Airfoil on Outboard Wing, Span to 28m
    • Reasons for Changes - Improve lift distribution to near elliptical - Less profile drag with Delft DU99-138 - Improve low speed, 1.8m more span - Strengthen wing for 850kg max weight
    • L. Boermans & M. Hulst designed new airfoil and winglet for outer wing panel
    • 2% Less profile drag at high speeds & 4% at low speeds relative to wing.
  • 17. Skin Removal & Contouring
  • 18. Skin Replacement & Aileron Construction
  • 19. New Airfoil & Wing Contouring
  • 20. Wing Tip Construction
  • 21. Removable Tip and Perspective
  • 22.  
  • 23. Internal Airflow Improvement
  • 24.  
  • 25. Ship met All Expectations Winning 03 Open Class Nationals
  • 26. Remaining Work
    • Build Lighter Weight Ailerons
    • Build and Test Delft Winglets per Boermans & Hulst Design
    • Obtain Performance Polar for Completed ASW22DB
  • 27.  
  • 28. Comparisons
  • 29. Design Team