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

2. 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

3. 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

4. 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

5. 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”

6. 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)

7. 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

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

9. Questions?