Team 5 Propulsion PDR Scott Bird Mike Downes Kelby Haase Grant Hile

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Presentation transcript:

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

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

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

Preliminary Choice for Engine BME-50 Power = 5.0hp RPM: 1200-10,000 Weight = 3.25 lbs. October 7, 2003 Propulsion PDR

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 October 7, 2003 Propulsion PDR

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

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

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

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

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

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 October 7, 2003 Propulsion PDR

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

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

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

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

Propeller Sizing Maximum Efficiency at Cruise is 3800 RPM At Maximum Efficiency of Cruise – CT = 0. 0145 At Maximum Efficiency – CP = 0.0078 October 7, 2003 Propulsion PDR

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 October 7, 2003 Propulsion PDR

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

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

Questions Questions?? October 7, 2003 Propulsion PDR

Engine Study October 7, 2003 Propulsion PDR