1. Team 5 Propulsion PDR Scott Bird Mike Downes Kelby Haase Grant Hile
Cyrus Sigari
Sarah Umberger
Jen Watson
October 7, 2003
Propulsion PDR

2. Preview Engine Selection Propeller Sizing Manufactured Choice
October 7, 2003
Propulsion PDR

3. Constraining Conditions
SHPconstraint = 4.08
SHPdesign=5.0
October 7, 2003
Propulsion PDR

4. Preliminary Choice for Engine
BME-50
Power = 5.0hp
RPM: ,000
Weight = 3.25 lbs.
October 7, 2003
Propulsion PDR

5. Propeller Sizing Used modified gold.m code
Varied Pitch and Propeller Diameter
Assume RPM = 7000
Assume Velocity = 50 ft/s
October 7, 2003
Propulsion PDR

6. Propeller Sizing Coefficient of Thrust vs. Advance Ratio
October 7, 2003
Propulsion PDR

7. Propeller Sizing Coefficient of Power vs. Advance Ratio
October 7, 2003
Propulsion PDR

8. Propeller Sizing Efficiency vs. Advance Ratio October 7, 2003
Propulsion PDR

9. Propeller Sizing Efficiency vs. Power Output Blue: Increasing Pitch
Black: Increasing Diameter
October 7, 2003
Propulsion PDR

10. Propeller Sizing Efficiency vs. Power Output Diameter = 25” Pitch = 6”
October 7, 2003
Propulsion PDR

11. Propeller Sizing Efficiency vs. Power Output at 7000RPM Pitch = 6 in.
Diameter = 25 in.
J = /rev
η = 51%
Power = 4.71 hp
CT = 0.034
CP =
Velocity = 50 ft/s
October 7, 2003
Propulsion PDR

12. Propeller Sizing Used second modification of gold.m code
Held Pitch constant at 6 inches and Diameter constant at 25 inches
Assume Velocity = 50 ft/s
Varied RPM
October 7, 2003
Propulsion PDR

13. Propeller Sizing Efficiency vs. Advance Ratio October 7, 2003
Propulsion PDR

14. Propeller Sizing Coefficient of Thrust vs. Advance Ratio
October 7, 2003
Propulsion PDR

15. Propeller Sizing Coefficient of Power vs. Advance Ratio
October 7, 2003
Propulsion PDR

16. Propeller Sizing Maximum Efficiency at Cruise is 3800 RPM
At Maximum Efficiency of Cruise – CT =
At Maximum Efficiency – CP =
October 7, 2003
Propulsion PDR

17. Propeller Selection
Chose propeller from available stock at
Comparison of available propellers to Efficiency graph, chose a 22 in. X 8 in. propeller
October 7, 2003
Propulsion PDR

18. Propeller Selection New Propeller – 22 in. X 8 in. At 7000 RPM
J = 0.234
CP = 0.022
CT = 0.048
η = 50%
At Cruise, best RPM = 3300
October 7, 2003
Propulsion PDR

19. Diameter of propeller = 22 inches Pitch of propeller = 8 inches
Summary
Diameter of propeller = 22 inches
Pitch of propeller = 8 inches
Efficiency of propeller = 50%
Still to Come
Geometric Properties such as airfoil section, twist distribution, chord distribution and shape
Trade studies of effect of AR and CLmax on Power Loading
October 7, 2003
Propulsion PDR

20. Questions
Questions??
October 7, 2003
Propulsion PDR

21. Engine Study
October 7, 2003
Propulsion PDR