John Apostol, Chris Grupido, Douglas Klutzke Propulsion QDR John Apostol, Chris Grupido, Douglas Klutzke

Objectives Update sizing Provide Current Propulsion Selection Battery Selection Speed Controller Motor Selection Propeller Selection Static test several propellers Folding Propeller Option for Landing Clearance Theoretical Flight Data Flight Time Motor Efficiency

Current Sizing Power Loading = 18.66 lbf/bhp Motor Power = .11 bhp Weight = 2.01 lbf Wing Span = 4.57 ft AR = 6.2 Wing Area = 3.37 ft2

Constraints Illustrated effect of increasing climb angle to 30 degrees on constraint diagram. Decreases power loading from 25.5 lbf/bhp to 18.6 lbf/bhp. Climb Angle = 20o Climb Angle = 30o

Batteries and Controller Kokam Li-Poly 2 cell 1250 mAh 10C Discharge 7.4 volts (0.18 lbf) 2.92 oz 1.65” by 3.1” by .43” Castle Creations Sprite-25P 25 amp (0.03 lbf) 0.5 oz .9” by .7”

Motor Graupner SPEED 600 7.2V 0.43 lbf (6.88 oz) .178 shaft horsepower .116 useful horsepower 69% motor efficiency 65% propeller efficiency 22 amps 7.2 volts 8600 Loaded RPM Small Propeller Size (No Gearbox)

Propeller Specifications Physical Characteristics Smaller Propeller due to Landing Gear Change Graupner Scimitar Folding Prop 8” Diameter 6” Pitch Less than .48 oz (.03 lbs) Landing Concerns Prop Clearance if Pitched Forward Test Folding Propellers for Clearance Safety

Flight Specs Propulsion Weights Overall Motor Efficiency 67% Flight Time Assuming 22 amps & 7.2 volts 15 minutes

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