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Presentation Layout

Presentation Layout. Problem Description and Identification Team Architecture and Group Responsibilities Technical Presentations Aero Group - David Jamison and Todd Gregg Propulsion Group - Brian Clark Structures Group - Mike Blacet Financial Overview Highlight Video

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Presentation Layout

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  1. Presentation Layout • Problem Description and Identification • Team Architecture and Group Responsibilities • Technical Presentations • Aero Group - David Jamison and Todd Gregg • Propulsion Group - Brian Clark • Structures Group - Mike Blacet • Financial Overview • Highlight Video • Questions and Comments Aggie Aquanauts

  2. Contest Description and Restrictions 500 ft. 500 ft. • Competition Track: • Contest Restrictions: • 100 Feet for Takeoff • Wing Span Less Than 9 Feet • Structure Must Withstand 2.5g Loading • Must be Propeller Driven by Commercially Available Electric Motor • Aircraft Take Off Gross Weight May Not Exceed 55 lbs. Aggie Aquanauts

  3. Problem Identification and Strategy Development • Takeoff Deemed Critical Flight Phase • How Much Weight Can We Lift? • Design Spreadsheet • Power Limit Feedback from the Propulsion Group • Selected Heavy Lift per Sortie Strategy • Relatively Short Sortie Pattern • Land, Taxi, Unload, Reload, Clear, Takeoff • Landing Gear Became a Critical Component • Able to Carry and Absorb Impact Loading • Reduce Ground Time Aggie Aquanauts

  4. Introduction of Group Leaders Chief Engineer - Mark Freeman Aero Leader Propulsion Leader Structures Leader Mike Blacet Scott St. John David Jamison Aggie Aquanauts

  5. Aerodynamics Group David Jamison Todd Gregg • Group Members • Responsibilities • Design of the Aircraft • Wing / Airfoil Design and Selection • Control Surface Sizing and Handling Qualities • Aircraft Performance in ALL Flight Phases • Monokoting Aggie Aquanauts

  6. Propulsion Group Mohammed Ali Roshani Jayasekara • Group Members • Group Responsibilities • Selection and Testing of All Propulsive Elements • Motor, Gearbox, Propeller, and Batteries • Equipment Maintenance, Break-In, and Adjustment Brian Clark Prasad Perera Scott St. John Aggie Aquanauts

  7. Structures Group • Group Members Mike Blacet Amanda Myers Eng Sheng Ngoi Eng Miau Chew Kek-Yau Tan Kok Leong Choo Tiong Hoe Lim Wei Kian Lim Aggie Aquanauts

  8. Structures Group • Group Responsibilities • Structural Design and Analysis • Selection of Construction Materials • Internal Layout and Component Placement • Preparation of Construction Drawings • Primary Construction Group Aggie Aquanauts

  9. Aerodynamics Presentation: Todd Gregg and David Jamison

  10. Aerodynamics Presentation • Conceptual Design • Conceptual Sketches • Rating the Designs • Spreadsheet Analysis • Tail Configurations • Stability and Control Surface Sizing • Detailed Design and Refinements Aggie Aquanauts

  11. Conceptual Design • Conceptual Sketches • Rating the Designs Aggie Aquanauts

  12. Spreadsheet Analysis • Design Spreadsheet Output • Trend: Increase Weight - Increase Required Power • Propulsion Power Approximation ~ 1000 Watts Power Required vs. Total Weight Aggie Aquanauts

  13. Tail Configurations • Sketches • Rating the Designs Aggie Aquanauts

  14. Stability and Control Surface Sizing • Stability and Control • Longitudinal • Lateral • Control Surface Sizing • Elevator • Ailerons • Rudder Elevator Rudder Aggie Aquanauts

  15. Detail Design and Refinements • NACA Scoops • Provide Cooling Air For Batteries • Wing Tip Plates Scoop • Reduce Vortex Shedding • Improve Efficiency of Wing Aggie Aquanauts

  16. Detailed Design and Refinements • Aerodynamically Balanced Rudder • Reduce Hinge Moment • Decrease Servo Size • Graphic Design and Monokote • Good Visibility • Attractive Aggie Aquanauts

  17. Propulsion Presentation: Brian Clark

  18. Propulsion Presentation • Introduction • Propulsive Restrictions • Preliminary Analysis and Research • Motor Selection • Selected Motor’s Characteristics • Battery Selection • Propeller Selection • System Modifications Aggie Aquanauts

  19. Introduction • Propulsive Restrictions • Propeller Driven by Electric Motor • Nickel Cadmium Battery Energy Source • Preliminary Analysis and Research • Internet and Literature Survey • Preliminary Trade Studies - Electricalc Aggie Aquanauts

  20. Motor Selection • Initial Target Power Output - 1000 Watts • Design Spreadsheet for Target Weight/Wing Area • Assume 50% System Efficiency • Motor Alternatives Considered • Aveox 1817/3Y • Astro 90 Aggie Aquanauts

  21. Selected Motor’s Characteristics • Target Motor Parameters • Motor Efficiency vs. Current and Voltage • Heat Loss = I2R Aggie Aquanauts

  22. Battery Selection • Considerations for Battery Selection • Weight • Battery Efficiency • Amount of Useful Power Supplied • Battery Alternatives Considered • Capacitance: 3000 mAh - 4000 mAh - 4400 mAh - 5000 mAh - 7000 mAh Aggie Aquanauts

  23. Battery Power vs. Weight Selected Capacitance Aggie Aquanauts

  24. Battery Efficiency vs. Cell Capacitance Selected Capacity Aggie Aquanauts

  25. Propeller Characteristics and Efficiency P/D - Pitch to Diameter ratio J - Advance Ratio Propeller Selection Efficiency vs. Advance Ratio Aggie Aquanauts

  26. System Modifications • Initial Performance • Motor Power Input: • 1500 Watts @ 4500 RPM, Drawing 33 Amps • Available Solutions • Change the amount gear reduction • Increase the propeller diameter • Advance the timing of the motor Aggie Aquanauts

  27. System Modifications • Comparison of various solutions • Selected Solution • Reduced gear ratio from 2.7:1 to 2.3:1 • Advanced the motor timing to 15 degrees • Results • Motor Power Input: • 2400 Watts @ 5210 RPM, Drawing 50 Amps Aggie Aquanauts

  28. Structures Presentation: Mike Blacet

  29. Structures Presentation • Introduction • Preliminary Analysis and Research • Structures Group Architecture • Fuselage Design • Wing Design • Landing Gear Design Aggie Aquanauts

  30. Introduction • Preliminary Analysis and Research • Internet and Literature Survey • Construction, Analysis, and Testing of Kit Airplane • Analysis of Trade-Offs Between Design Alternatives • Structures Group Architecture • Fuselage Team • Wing Team • Landing Gear Team Aggie Aquanauts

  31. Longerons Spruce Carbon Fiber Skins 1/8 in. Balsa Sheet Carbon Fiber Fuselage Design Aggie Aquanauts

  32. Wingbox Loading Permanent Attachment to Center Wing Section Foam/Carbon Fiber Fuselage Design Aggie Aquanauts

  33. Spars Double Spar Spruce Carbon Fiber Shear Webs Foam/Carbon Fiber Center Wing Section Wing Design Aggie Aquanauts

  34. Landing Gear • Critical Component • Magnitude of Load • Ground Handling • Main Gear • Rectangular Aluminum Shaft • Compression Spring • Located in Wing • Hard Rubber Wheels with Bearings Aggie Aquanauts

  35. Nose Gear Circular Aluminum Shafts Compression Spring Tilted Forward at 7° Angle Steering Braking Landing Gear Aggie Aquanauts

  36. $ $ $ $ $ $ Financial Overview: Mark Freeman $ $ $ $ $

  37. Expenditure Review • Cost by Category Aggie Aquanauts

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