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Team 5 Propulsion PDR

Team 5 Propulsion PDR. Scott Bird Mike Downes Kelby Haase Grant Hile Cyrus Sigari Sarah Umberger Jen Watson. Preview. Engine Selection Propeller Sizing Manufactured Choice. Constraining Conditions. SHP constraint = 4.08 SHP design =5.0. Preliminary Choice for Engine. BME-50

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Team 5 Propulsion PDR

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

  2. Preview • Engine Selection • Propeller Sizing • Manufactured Choice Propulsion PDR

  3. Constraining Conditions • SHPconstraint = 4.08 • SHPdesign=5.0 Propulsion PDR

  4. Preliminary Choice for Engine • BME-50 • Power = 5.0hp • RPM: 1200-10,000 • Weight = 3.25 lbs. Propulsion PDR

  5. Propeller Sizing • Used modified gold.m code • Varied Pitch and Propeller Diameter • Assume RPM = 7000 • Assume Velocity = 50 ft/s http://www.danspropshop.com/pitch.html Propulsion PDR

  6. Propeller Sizing • Coefficient of Thrust vs. Advance Ratio Propulsion PDR

  7. Propeller Sizing • Coefficient of Power vs. Advance Ratio Propulsion PDR

  8. Propeller Sizing • Efficiency vs. Advance Ratio Propulsion PDR

  9. Propeller Sizing • Efficiency vs. Power Output Blue: Increasing Pitch Black: Increasing Diameter Propulsion PDR

  10. Propeller Sizing • Efficiency vs. Power Output Diameter = 25” Pitch = 6” Propulsion PDR

  11. Propeller Sizing • Efficiency vs. Power Output at 7000RPM • Pitch = 6 in. • Diameter = 25 in. • J = 0.2057/rev • η = 51% • Power = 4.71 hp • CT = 0.034 • CP = 0.0139 • Velocity = 50 ft/s 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 Propulsion PDR

  13. Propeller Sizing • Efficiency vs. Advance Ratio Propulsion PDR

  14. Propeller Sizing • Coefficient of Thrust vs. Advance Ratio Propulsion PDR

  15. Propeller Sizing • Coefficient of Power vs. Advance Ratio Propulsion PDR

  16. Propeller Sizing • Maximum Efficiency at Cruise is 3800 RPM • At Maximum Efficiency of Cruise – CT = 0. 0145 • At Maximum Efficiency – CP = 0.0078 Propulsion PDR

  17. Propeller Selection • Chose propeller from available stock at www.BMEengines.com • Comparison of available propellers to Efficiency graph, chose a 22 in. X 8 in. propeller 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 Propulsion PDR

  19. 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 Propulsion PDR

  20. Questions • Questions?? Propulsion PDR

  21. Engine Study Propulsion PDR

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