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  • 1. Coaxial Rotor UAV
    Jeremy Land
    McMurry University
    Physics Department
    Research Proposal
  • 2. Single main rotor
    Use a main rotor to generate lift
    Tail rotor balances main rotor’s torque
  • 3. Coaxial
    Two rotors spinning in opposite directions
    Compensate each other’s torque
    No need for tail rotor
    Aerodynamic symmetry
    Stable
    Easier to fly
    More compact
  • 4. Early UAVs
    QH-50C
    KA-137
  • 5. Goals
    To build an RC helicopter capable of stable flight designed with portability in mind.
    To construct a wireless video system.
  • 6. Design
    Cylindrical fuselage
    Will house electronics, battery, and motors
  • 7. Bottom rotor
    Controlled by two servos
  • 8. Top rotor
    Linked to mechanical stabilizer
  • 9. Motor
    Two DC hobbyist motors
  • 10.
  • 11. Rotors response to pitch command
  • 12. Inertia
    Rotors
  • 13. Shaft
  • 14. Fuselage
  • 15. Lift
    Lift
    Drag
    Where is the density of air, S is the surface area of the blade, U is the flow velocity, is the lift coefficient, is the drag coefficient, and is the velocity of the rotor blades.
  • 16. Communication
    Transmitter
    2.4 Ghz
    Receiver
    Gyro
    Electronic Speed Control
    Mixer
  • 17. Video system
    Cell phone camera
    Receiver
    Transmitter
  • 18. Schedule
  • 19. Budget
    Esky 4 in 1 controller $50
    2.4ghz transmitter $45
    Video receiver $35
    Video transmitter $35
    Misc. parts $40
  • 20. Conclusion
    The practicality of compact UAVs is viable market
  • 21. References
    Learn About Coaxial Helicopters. RC Airplane World. Retrieved February 24, 2011, from http://www.rc-airplane-world.com/coaxial-rc-helicopters.html
    Colin P. Colemen, A Survey of Theoretical and Experimental Axial Rotor Aerodynamic Research
    http://blog.ericlamb.net/wp-content/uploads/2010/01/apache.jpg
    http://www.fas.org/man/dod-101/sys/ac/row/ka-50.htm
    http://www.sergib.agava.ru/russia/kamov/137/ka137_e.htm
    http://www.gyrodynehelicopters.com/
  • 22. Questions?