1 Propulsion PDR Ashley Brawner Matt Negilski Neelam Datta Mike Palumbo Xing Huang Chris Selby Jesse Jones Tara Trafton AAE451: Balsa to the Wall Team 2
2 Presentation Overview Why a Ducted Fan? Pros Cons Performance Requirements Thrust Weight Power Ducted Fans Electric Motors Batteries Duct Design Fuselage Integration
3 Why a Ducted Fan? Pros No Propeller Tip Downwash Direct Drive Hand Launch / Belly Landing Higher Static Thrust Cons Duct Profile Drag Cost of Duct Capable Motor High RPM
4 Performance Requirements Power Loading 3.0 Weight Estimate 5.42 lb Power Required 1.8 hp ** Preliminary Sizing
5 Ducted Fan Candidates ManufacturerModelDiameterWeightMax RPMCost [ in ][ lbs ][ RPM ][ $ ] WeMoTecMidi Fan ,000$74.95 WeMoTecMini Fan ,000$53.90 Great PlanesHyperflow ,000$30.00 VASAVasaFan ,000$60.00
6 Electric Motor Candidates ManufacturerClassAvg. WeightAvg. Cost [ lbs ][ $ ] Kontronik $ Kontronik $ Kontronik $ Kontronik $150.00
7 Electric Motor Data
8 Electric Motor Data Cont’d
9 Electric Motor Data Cont’d
10 Batteries TypeVoltageAvg. WeightTotal WeightAvg. CostTotal Cost [ V ][ lbs ] [ $ ] NiMH1.20 per Cell0.09 per Cell2.70$3.00 per Cell$90.00 NiCd1.20 per Cell0.13 per Cell3.90$2.70 per Cell$81.00 LiPo3.70 per Cell0.13 per Cell1.30$25.00 per Cell$200.00
11 Propulsion Summary Motor Kontronik FUN 600–13 Kv = 1300 RPM/V Max Constant Current: 40 A Max # Cells: 30 Max Voltage: 36 V Battery 30 Cells 1.2 V /cell Speed Controller Kontronik Jazz Max Surge Current: 70 A Max # Cells: 32 Weight: 0.08 lbs
12 Propulsion Summary Cont’d WeMoTec Midi Fan Fan Dia: 3.5 in Max RPM: 36,000 Weight: lbs Performance Power: 1.8 hp Static Thrust: 4.86 lbf
13 Ducted Fan Measurements
14 Duct Design Slightly Converging Inlet 129% of Fan Swept Area Funnel Air into Fan Opposite of Turbo Jet Straight Outlet 99 % of FSA Promote Flow Opposite of Turbo Jet “Ducted Fan Design
15 Duct Design Cont’d WeMoTec Midi Fan
16 Duct Design Cont’d Duct Measurements 2~3 in ~1 in
17 Fuselage Integration Duct Placement Duct will be integrated on top of fuselage Promote external boundary layer Ingestion Less drag than mounting a nacelle Room for payload below duct
18 Propulsion Cost Analysis To Achieve Mission Requirements Motor$ Batteries$ Ducted Fan$ Materials ~$ Sum$365.00
19 Questions?