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Published byPierce Hall Modified over 6 years ago
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Propulsion PDR 1 Team #3 Presented by: Greg Davidson Etan Karni
Colleen Rainbolt
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Propulsion Selection Process
Obtained Fall ’02 propulsion design code to select optimum motor from database Motor database (brushed only) created from Motocalc data 72 motors in database Obtained Gold.m code for propeller analysis Integrated Gold.m into Fall ’02 code
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Motor Analysis—Prop ‘02 Code execution steps Modifications
Aircraft operating point Optimal prop size Motor operating point Gear ratio Battery analysis Modifications Propeller analysis using Gold.m Automatic evaluation of complete motor database
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Propeller Analysis—Gold.m
Uses Blade-Element theory to analyze an arbitrary propeller Propeller analysis based on Clark-Y airfoil
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Propeller Trade Study: =0.6
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Propeller Trade Study: =0.8
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Propeller Trade Study: =1.0
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Propeller Trade Study Results
Pitch Ratio Propeller Diameter Propeller RPM Power Required 0.6 11.4 in. 3760 28.0 W 0.8 9.3 in. 4610 29.9 W 1.0 8.1 in. 5280 31.8 W
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Selected Propeller Properties
Diameter 11.4 in. Pitch 6.8 in. RPM 3760 RPM Chord 0.6 in. Reynolds Number ~100,000
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Optimum Electric Motors
Top 5 motors from database Graupner Speed V Mabuchi RS-550 Mabuchi RS-380 Multiplex Permax 7.2V Multiplex Permax 6.0V Graupner motor selected on the basis of cost and availability
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Graupner Speed 400 Rated horsepower .055 hp Motor efficiency 72%
Motor constants Kv = 2332 RPM/V Kt = 0.58 In-oz/amp R = Ohms Io = 0.5 Amps Rated number of cells 6 NiCad or 2 Lithium Rated voltage 7.2 V Price $9.50 (Hobby Lobby)
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Selected Gearbox Gear Ratio 4.09 : 1 Efficiency 85% Price
$11.90 (Hobby Lobby)
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Future Considerations
Confirm validity of this propulsion system choice Closely matches what is already in the sizing/constraints code Modify weights code to include fixed propulsion system weight Perform more in-depth analysis of propeller on and off design point
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Questions?
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