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

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?