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Published byHarvey Jordan Modified over 6 years ago
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Team 5 Propulsion PDR Scott Bird Mike Downes Kelby Haase Grant Hile
Cyrus Sigari Sarah Umberger Jen Watson October 7, 2003 Propulsion PDR
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Preview Engine Selection Propeller Sizing Manufactured Choice
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Constraining Conditions
SHPconstraint = 4.08 SHPdesign=5.0 October 7, 2003 Propulsion PDR
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Preliminary Choice for Engine
BME-50 Power = 5.0hp RPM: ,000 Weight = 3.25 lbs. October 7, 2003 Propulsion PDR
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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
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Propeller Sizing Coefficient of Thrust vs. Advance Ratio
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Propeller Sizing Coefficient of Power vs. Advance Ratio
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Propeller Sizing Efficiency vs. Advance Ratio October 7, 2003
Propulsion PDR
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Propeller Sizing Efficiency vs. Power Output Blue: Increasing Pitch
Black: Increasing Diameter October 7, 2003 Propulsion PDR
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Propeller Sizing Efficiency vs. Power Output Diameter = 25” Pitch = 6”
October 7, 2003 Propulsion PDR
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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
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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
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Propeller Sizing Efficiency vs. Advance Ratio October 7, 2003
Propulsion PDR
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Propeller Sizing Coefficient of Thrust vs. Advance Ratio
October 7, 2003 Propulsion PDR
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Propeller Sizing Coefficient of Power vs. Advance Ratio
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Propeller Sizing Maximum Efficiency at Cruise is 3800 RPM
At Maximum Efficiency of Cruise – CT = At Maximum Efficiency – CP = October 7, 2003 Propulsion PDR
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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
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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
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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
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Questions Questions?? October 7, 2003 Propulsion PDR
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Engine Study October 7, 2003 Propulsion PDR
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