1. Propulsion QDR 2 AAE451: Balsa to the Wall Team 2
Ashley Brawner Matt Negilski
Neelam Datta Mike Palumbo
Xing Huang Chris Selby
Jesse Jones Tara Trafton

2. Ducted Fan Candidates Manufacturer Model Diameter Weight Max RPM Cost
[ in ]
[ lbs ]
[ RPM ]
[ $ ]
WeMoTec
Midi Fan
3.5
0.231
35,000
$74.95
Mini Fan 480
2.72
0.132
45,000
$53.90
Great Planes
Hyperflow
2.23
0.081
49,000
$30.00
VASA
VasaFan 65
2.6
0.077
$60.00
-Research led us to believe these are best
-WeMoTec is the standard
-Size (last three about the same)
-Expensive

3. Thrust Calculations

4. Ideal Thrust Curve
Max Max RPM
108.3 ft/s
(73.6 mph)

5. Max Speed @ Max Continuous Current of Motor
Actual Thrust Curve
Max Max Continuous Current of Motor
92.5 ft/s
(63.1 mph)

6. Motor Constant

7. Thrust Comparison Fan Fan w/ Motor WeMoTec Mini Fan
RPM 45,000
Max Speed ft/s
Max Speed 1.4 lbf
Fan w/ Motor
WeMoTec Mini Fan + Mega Can 16/25/2
RPM 41,500
Max Speed ft/s
Max Speed 1.0 lbf

8. Propulsion Summary Motor Mega ACn 16/15/2 Battery Speed Controller
Kv RPM/volt
Resistance Ω
No Load Current A
Max Constant Current 35 A
Battery
15 Cells NiMH V/cell
Speed Controller
Castle Creations Phoenix-35
Max Surge Current 45 A
Max # Cells 16

9. Batteries
Type
Voltage
Avg. Weight
Total Weight
Avg. Cost
Total Cost
[ V ]
[ lbs ]
[ $ ]
NiMH
1.20 per Cell
0.09 per Cell
1.35
$3.00 per Cell
$45.00
NiCd
0.13 per Cell
1.95
$2.70 per Cell
$40.50
LiPo
3.70 per Cell
0.65
$25.00 per Cell
$150.00
-Possible batteries -Different classes main diff is composition and weight
-LiPo is best
-We needed about 28.8 volts, leads to these total calculations

10. Ducted Fan -Ducted fan works on different principles than prop
-Sucks air, does not cut the air like a prop does
-smaller disk  higher RPM

11. Duct Design Slightly Converging Inlet Straight Outlet
129% of Fan Swept Area (FSA)
Funnel Air into Fan
Opposite of Turbo Jet
Straight Outlet
100 % of FSA
Promote Flow
DFan= Diameter of Fan
DHub= Diameter of Hub
-You can add to the thrust by designing a duct
-inlet to be converging to help funnel air into fan
-fan can only handle so much air at a time, if funnels too much, leads to extreme drag -
FSA highlighted in blue

12. Duct Design Cont’d
WeMoTec Mini Fan

13. Fuselage Integration

14. Propulsion Cost Summary
Item
Part
Weight
Cost
[ lbs ]
[ $ ]
Fan
WeMoTec Mini Fan
0.13
$53.90
Motor
Mega ACn 16/15/3
0.17
$80.00
Battery
15 NiMH Cells
1.40
$45.00
ESC
Phoenix-45
0.08
$95.00 (Not Included)
Total
1.79 lbs
$178.90

15. Propulsion Summary Max Speed Propulsion System Weight Suggestions
92.2 ft/s (61.1 mph)
Propulsion System Weight
1.79 lbs
Suggestions
Revisit Sizing
Decide on Motor in Next Class (10/5)

16. Questions?