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Project Dragonfly

Project Dragonfly. Tony Waymire (TL) Peter Parmakis John Barthe Jason Mickey Tyler Gillen Andy Betourne. Purpose. High-performance aerobatics Low drag Low cost Two seat trainer capability Satisfy all LSA requirements. Competition. Configurations. John Barthe. Responsibilities.

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Project Dragonfly

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  1. Project Dragonfly Tony Waymire (TL) Peter Parmakis John Barthe Jason Mickey Tyler Gillen Andy Betourne

  2. Purpose • High-performance aerobatics • Low drag • Low cost • Two seat trainer capability • Satisfy all LSA requirements Waymire

  3. Competition Waymire

  4. Configurations John Barthe

  5. Responsibilities • Determine Internal and External Layout • Find CG locations • For crew configurations • For fuel configurations • Design CAD Model Barthe

  6. Configuration Down-Selection Barthe

  7. Configuration Down-Selection Barthe

  8. Component and CG Locations • Engine (RED) • Crew Compartment (BLUE) • Tandem Seating • Fuel (GREEN) • Sensor hub (PINK) Barthe

  9. Tractor Barthe

  10. Twin Boom Barthe

  11. Pusher Barthe

  12. Future Work • Modification of internal structure and landing gear • Addition of control surfaces • Detailed model of propulsive system, cabin compartment, and all tertiary components • Further refined CG location Barthe

  13. Performance Andy Betourne

  14. Responsibilities Mission profile Constraint analysis Power required Turn performance Betourne

  15. Desired Requirements Betourne

  16. Mission Profile • Acrobatic mission • Maneuver near airfield Betourne

  17. Mission Profile • Ferry Mission • Maximize range 4 Betourne

  18. Constraint Diagram Design Point Betourne

  19. Power Required Betourne

  20. Turn Performance Betourne

  21. Future Work • Take-off and landing analysis • Detailed turn analysis • Climb and dive performance • Roll and loop feasibility Betourne

  22. Aerodynamics Tyler Gillen

  23. Responsibilities • Determine wing size and shape • Choose sample airfoil for calculations • Extract lift and drag coefficients for various stages of flight • Ensure stall speed requirements are met Gillen

  24. Wing Sizing and Layout • Take weight and wing loading numbers to get wing area. Initially S=110 ft2 • High-,Mid-, or Low-wing? 5 • Mid-wing reduces dihedral effect • Mid-wing reduces interference drag • No wing dihedral used Gillen

  25. Wing Sizing and Layout cont. • No wing quarter-chord sweep • Aft sweep leads to tip stall, increases weight • No wing twist used • Could be used to maintain aileron effectiveness • Leads to increase in manufacturing cost • Aspect Ratio=6 2 • Looked into similar aerobatic planes and many used this value • Higher AR is more efficient, had higher (L/D)max but stalls at lower angle of attack Gillen

  26. Wing Sizing and Layout cont. • Taper Ratio=.45 • l=.45 gives lift distribution closest to ideal 5 • l=.4 would be best for weight 5 Gillen

  27. Airfoil Selection • Looked into aerobatic, other symmetrical airfoils • Analyzed all candidates with XFOIL program • Chose NACA 2412 6 Gillen

  28. Lift and Drag Coefficients • Determined lift and drag coefficients using XFOIL and methods in Raymer 7 and Roskam 8 9 Gillen

  29. Stall Speed Requirement • Needed to increase wing area to meet stall speed requirement • Requirement: maximum stall speed is 45 kts • Increased area to S=125 ft2 • Vs=44.8 kts Gillen

  30. Resulting Wing shape Gillen

  31. Future Work • Employ numerical methods to determine lift to a greater accuracy and get spanwise lift distribution • Component by component lift and drag breakdown • Research and choose an aerobatic airfoil to meet requirements Gillen

  32. Stability and Control Tony Waymire

  33. Responsibilities • Initial tail sizing • Control surface sizing • Neutral point calculations • Static margin Waymire

  34. Tail Dimensions 10 Waymire

  35. Tail Dimensions 10 Waymire

  36. Neutral Point / Static Margin • Neutral point calculated using Raymer 10 • Power on neutral point not yet available Waymire

  37. Future Work • Trim analysis • Turn rate analysis • Tail size trade studies Waymire

  38. Structures Peter Parmakis

  39. Responsibilities Fuselage Structures Wing Structures Landing Gear V-n Diagram Parmakis

  40. Fuselage Structures • Ring support • Longerons • Skin • Load Paths • Materials Parmakis

  41. Wing Structures 11, 12 Spar Ribs Skin Materials Parmakis

  42. 6-gee Wing Loads Parmakis

  43. -3-gee Wing Loads Parmakis

  44. Landing Gear 11 Tail Dragger Prop and tail strike Parmakis

  45. V-n Diagram 13 • Max positive load: 6 gees • Max negative load: -3 gees Parmakis

  46. V-n Diagram Parmakis

  47. Future Work • Advanced structural analysis (FEM) • Detailed structure sizing • Component-wise material selection • Landing gear positioning Parmakis

  48. Propulsion Jason Mickey

  49. Propulsion Considerations • Required Power vs. Available Power • Propeller Sizing • Engine Weight • Fuel Consumption Mickey

  50. Power Available Need at least 38 HP Mickey

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