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Preliminary / Interim Design Team 6
November 9, 2010
UAV Team SpecializationsTJ Worden – Wing DesignMatthew Martin – Fuselage ConfigurationDavid Neira – Power & PropulsionJosh Mellen – Electronics & Control (Hardware)Ona Okonkwo – Electronics & Control (Software)Josiah Shearon – Materials Selection & Fabrication
Presentation OutlineScoring Sensitivity StudyAirframe LayoutSubsystem BreakdownInterim DesignSummary
Rule Change
RAC
MMMeFlightScor 321
Previous
Final
Scoring Sensitivity Study
1 2 3 4 5 6 7 8 9 100
0.2
0.4
0.6
0.8
1Mission 1 Score
Empty Weight (lbs)
N/Nmax
0.8-1
0.6-0.8
0.4-0.6
0.2-0.4
0-0.2
Scoring Sensitivity Study
1 2 3 4 5 6 7 8 90
1
2
3Mission 2 Score
Empty Weight (lbs)
P/W Ratio1.8-2.25
1.35-1.8
0.9-1.35
0.45-0.9
0-0.45
Scoring Sensitivity Study
1 2 3 4 5 6 7 8 90
0.25
0.5
0.75
1
Mission 3 Score
Empty Weight (lbs)
N/Nmax
1.6-2
1.2-1.6
0.8-1.2
0.4-0.8
0-0.4
Scoring Sensitivity Study
Airframe Layout– Fuselage
Figure of Merit Weighting Factor Double Boom Single Boom Blended Body
Weight 0.35 1 3 5
Drag 0.20 2 4 5
Ergonomics 0.15 2 5 1
Durability 0.10 3 4 5
Storage Capacity 0.20 5 4 1
Total 1.00 2.35 3.80 3.60
Airframe Layout – Wing
Figure of Merit Weighting Factor Monoplane Biplane Canard Delta Wing Flying Wing
Weight 0.15 4 1 3 4 1
Drag 0.20 4 2 2 1 3
Lift 0.30 3 5 4 3 4
Portability 0.10 5 2 2 4 1
Stability 0.15 4 5 3 3 5
Manufacturability 0.10 5 4 2 3 1
Total 1.00 3.90 3.40 2.90 2.85 2.90
Airframe Layout - Tail
Figure of Merit Weighting Factor Conventional V-Tail Twin Tail T-Tail
Weight 0.15 3 4 3 2
Drag 0.20 4 5 3 3
Stability 0.35 5 2 3 3
Maneuverability 0.20 5 2 4 4
Manufacturability 0.10 4 2 3 3
Total 1.00 4.40 2.90 3.20 3.05
Airframe Layout– Propeller
Figure of Merit
Weighting Factor
Single Tractor Single Pusher Dual Tractors Tractor /
Pusher Ducted Fan
Weight 0.30 5 5 3 3 1
Efficiency 0.30 4 3 3 2 5Launch
Recovery 0.30 3 2 5 4 4
Complexity 0.10 5 4 2 2 1
Total 1.00 4.10 3.40 3.50 2.90 3.10
Preliminary Layout
Motor SpecificationsHimax HA2025-4200 Geared
Electric Brushless Inrunner
LightweightHigh efficiencyHigh torqueDurable
Specs:Power: 175WKV: 4200Gear Ratios: 6.6:1, 5.3:1, 4.4:1ESC Rating: 15AWeight: 80gShaft Diameter: 3mm
ELECTRONICS & CONTROLS
Note: Toxicity in reference to the two types of batteries mentioned above.
Batteries SelectionFOM NiCd NiMHNominal Cell Voltage 1.2V 1.2VEnergy Density 50-150 140-300Cycle Durability 2000 1500Memory Effect Y NInternal Resistance Very Low LowToxicity Medium Low
• NiMH best candidate based on Energy Density and NiCd’s Memory Effect; Li-Po not allowed
• Competition Requirement: 20A ATO Blade Fuse
ELECTRONICS & CONTROLS
Cell packs Offer range of Capacity, Weight and CostFixed dimensions
Individual Cells Offer more versatility in weight, size and costRequires soldering
Battery SelectionFigures of Merit Supercharge
Orion 1500 Speedpack 2400 Traxxis Power Cell 6 Cell 1500 Speedpack 1800 Individual Cell –
Elite 1500Cell Voltage 7.2 V 7.2V 7.2V 7.2V 1.2V
Amp-Hours 1600 mAh 2400 mAh 1500 mAh 1800 1500
Weight 5.6 oz 12 oz 8 oz 10.4 oz 0.81 oz
Dimensions (in3) 4.4 x 2.2 x 0.9 7.7 x 2 x 1 5.6 x 3 x 1 7.6 x 2.1 x 1.2 1.13 x 0.66 x 0.66
Cost $21.15 $20.81 $11.09 $11.68 $2.25
ELECTRONICS & CONTROLS
Servo Controller RequirementsProgrammable for Fail-Safe ManeuverSupport for 4 Servos, 1 Gyroscope
Micro Maestro 6-ch USB Servo ($19)ESC Requirements
ESC Continuous Amp higher than Motor ESC RatingProgrammable; Can control at least 1 MotorPropulsion Battery Pack limited to 0.75lbs
Controllers SelectionFigures of Merit CC Thunderbird 18 CC Phoenix 25 Atlas Black 20
Weight 0.6 oz 0.6 oz 0.625 oz
Size 1.32x0.33x0.90 in 1.08x0.91x0.16 in 1.875x0.875x0.375 in
Continuous Amp 18 25 20
Cost $33.95 $67.95 $38.99
Electronics & Controls
Spektrum DX6i 6-channel transmitter.Transmits on 2.4GHz bandPractically safe from internal and external Radio Frequency
(RF)
AR6200 6-channel receiver.Combined internal and external receiverSafe RF linking
Transmitter /Receiver
Electronics & Controls
Gyroscopes – Device measuring orientation, based on the principles of conservation of angular momentum.
Accelerometer – A device that measures proper acceleration relative to freefall.
None – A situation in which no stabilizing instrument would be used.
Sensors
Figure of Merit Weighting Factor Gyroscopes Accelerometer NoneWeight 0.25 5 3 5
Complexity 0.20 3 4 5Effectiveness 0.55 5 1 1
Total 1.00 4.60 2.10 2.80
Electronics & Controls
Gyroscopes
STMicroelectronics MEMS
Gyroscopes Futaba GY520 KX870016A - GP750Weight < 5 g 6.9 g 14 g
Capability 5 5 5Current Draw 6.8 mA 40 mA (without servo) <80 mA
Operating voltage from 2.7 to 3.6 V from 3.8 to 6.0 V from 4.5 to 7.0 VSize < 20 mm 20.8 x 20.8 x 11mm 26x25x11 mmPrice $7 $150 $167
Electronics & Controls Integrated Debugging Environment (IDE) – Microsoft Visual Studio
2010 Allows programming in C languageAlready accustomed to the softwareFree of charge
Radio Fail-Safe ManeuverKill ThrottleRoll RightYaw RightNose Up
Software
Wing DesignAirfoil Max Cl Stall Angle (deg) Max Aerodynamic
Efficiency (Cl/Cd) α at Max Eff (deg) Cl at α
NACA 4412 1.55 12.00 70.60 6.00 1.20
NACA 65-418 1.45 9.00 48.30 6.00 0.97
Eppler 395 1.65 9.00 85.29 6.00 1.45
DAE 11 1.78 15.00 56.00 10.00 1.56
Wing SizingAssumptions
Empty weight = 1.25 lbsPayload/Weight Ratio = 3:1Launch Speed = 22 MPH
Derived dimensionsWing Area = 336 in2
Wingspan = 48 inChord Length = 7 inAspect Ratio = 6.85
Fuselage
Front View
Top View
Interim Design
Future Work
December 1 Fabricate Interim Design
December 1, 2010 – January 1, 2011Test and refineIterate
Competition: April 15-17, 2011
Questions?