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Completed Design Review

Completed Design Review. Team Airblade Timothy Davenport Brian Guerrero Mark Kastantin Oscar Kataura William Peters Robert Taylor. Overview. Structural Changes since PDR Description of Finalized Design Design analysis: Stability and control

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Completed Design Review

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  1. Completed Design Review TeamAirblade Timothy Davenport Brian Guerrero Mark Kastantin Oscar Kataura William Peters Robert Taylor

  2. Overview • Structural Changes since PDR • Description of Finalized Design • Design analysis: Stability and control • Calculations: mass, payload, course completion time, etc. • Timeline

  3. Structural Changes since PDR • Trapezoidal cross-section >> triangular cross-section • Sides of craft: balsa boards >> triangular truss • Pitch propeller moved further forward

  4. Side View 78.74 inches 3.19 in 3.75 in 3.94 in Stabilizer Small motor Large motors with servos

  5. Top View 78.74 inches 3.75 in payload battery / control payload • note: balloons removed from view

  6. Front View 72º

  7. Structural Specifics • Propulsion: 1 large propeller at front end, 1 large propeller at back end • Pitch: 1 small motor at front end • Triangular truss for slanted sides, ladder design for top side • 2 meters long, 8.5 meters wide. • Balloons attached at front end, midpoint and back end.

  8. Balsa wood (3/8 inch squares) 2 large motors 2 large propellers 1 small motor 1 small propeller 2 servos 1 battery pack 1 radio control module 3 balloons with attachments (string) wire Materials Balloons and string are not included in mass calculations Wire is included in the mass of the other equipment

  9. Each side piece requires 40 pieces (3.75 inches each) Top piece requires 20 pieces (3.75 inches each) 3 pieces run the length of the structure (2 m each, or 78.74 inches) Length Calculation    =3.75(40(2)+20)+(3)78.74    =611.22 inches Balsa Wood Length

  10. Mass Calculation

  11. Roll Stability Balloon lift • Balloons are tied to bottom beam and top crossbars minimizing horizontal pull • All weight is centered on bottom beam Battery, radio control mass Motor, propeller mass

  12. Pitch Stability • Lift distributed evenly • Small motor provides pitch needed to maintain flight Variable

  13. Propulsion Drag • Two large motors running at 9.6V provides 2(0.79) = 1.58 N • Drag = 1.58 N (at steady state) Motor thrust

  14. Drag and Velocity This means the blimp should be moving at a fast walking speed. Drag coefficient for a sphere

  15. Turning 78.74 inches • The large motors work in tandem • Torque = (2)(39in)(0.0254 m/in)(0.79 N) = 1.57 N/m 3.75 in payload battery / control payload payload battery / control payload Center of mass

  16. Battery Life • One battery pack providing of lifetime • Time of completion of race track Ample lifetime for completion

  17. Timeline • Up to this point we have the truss structure complete and have attached the servos • For the rest of the time Monday Tuesday Wednesday Thursday Friday Saturday Sunday Week 1 Attach motors to structure Week 2 Complete WiringAttach Balloons Test Fly and Week 3 Optimize Trials

  18. Conclusion • So far the project has proceeded smoothly • Anticipate weight problems that will be fixed by sanding the structure • We feel we have a strong structure with great turning potential • Ready to finish building and get flying

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