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?