1. Propulsion PDR AAE 451: Team 2 Michael Caldwell Jeff Haddin
Asif Hossain
James Kobyra
John McKinnis
Kathleen Mondino
Andrew Rodenbeck
Jason Tang
Joe Taylor
Tyler Wilhelm
February 10, 2005

2. Overview Revisit Initial Sizing Motor Sizing Motor Selection
Propeller Sizing
February 10, 2005

3. Aircraft 3-View
February 10, 2005

4. Initial Sizing
February 10, 2005

5. Initial Sizing Mission Requirements 15 min. endurance
Take-off distance ≤ 60 ft.
Vstall ≤ 15 ft./s
Vloiter ≤ 25 ft./s
Turn Radius of 35 ft.
February 10, 2005

6. Initial Sizing Payload Rate Gyro: 0.06 lbf Auto Pilot: 0.20 lbf
Wheel Covers: 0.15 lbf
Total: 0.41 lbf
Weight
LiPoly: 1.97 lbf
NiCad: 3.87 lbf
February 10, 2005

7. Initial Sizing
Design Space
Design Point
February 10, 2005

8. Initial Sizing Conclusions Wing Loading: 0.376 lbf/ft2
Power Loading: lbf/hp
LiPoly
Weight: 1.97lbf
Wing Area: 5.24 ft2
Power: hp
NiCad
Weight: 3.87 lbf
Wing Area: ft2
Power: hp
February 10, 2005

9. Thrust Required
February 10, 2005

10. Power & Endurance Required
February 10, 2005

11. Component Trade Study www.hobby-lobby.com www.balsapr.com
February 10, 2005

12. Motor & Battery Selection
Brushless
Brushed
AXI 2808
2.75oz
1300RPM/V
$49.99
Graupner Speed 500
5.71oz
1300RPM/V
$16.90
Kokam Li-Poly
2 cell 1200mAh & 7.2v
1.8oz
$29.99
NiMH
7 cell 1100mAh & 7.2v
3.2oz
$31.20
February 10, 2005

13. Salient Propeller Parameters
Dimensional
Diameter
Pitch (forward motion in each rotation)
RPM
Flight velocity (Take-off and Loiter)
Non-dimensional
Thrust Coefficient
Power Coefficient
Propeller Efficiency
Advance Ratio
Goldstien’s Classical Vortex Model used in analysis
February 10, 2005

14. Turning vs. Loiter Operation
February 10, 2005

15. Thrust and Advance Ratio
February 10, 2005

16. Power and Advance Ratio
February 10, 2005

17. Propeller Efficiency and Advance Ratio
February 10, 2005

18. Choice of Motors (RPM)
February 10, 2005

19. Effect of Pitch and Diameter on Thrust
February 10, 2005

20. Effect of Pitch and Diameter on Power
February 10, 2005

21. Effect of Pitch and Diameter on Efficiency
February 10, 2005

22. Propeller Selection Brushless motor propeller Brushed motor propeller
10 in diameter
4.52 in pitch
82% efficiency
Brushed motor propeller
14 in diameter
4.84 in pitch
79% efficiency
February 10, 2005

23. Questions? Summary Revisit Initial Sizing Motor Sizing Motor Selection
Propeller Sizing
Questions?
February 10, 2005