Interim Design ReviewInterim Design Review

Group 13 – Flapping Wing MAVGroup 13 – Flapping Wing MAVNASANASA

Parker CookParker CookGeorge HellerGeorge HellerJoshua NguyenJoshua NguyenBrittney TheisBrittney Theis

The CustomerThe Customer

- Dr. ShihDr. Shih- Funding to be Funding to be

provided by the provided by the NASA Ames facilityNASA Ames facility

The ProblemThe Problem

- We are tasked with designing and We are tasked with designing and building a micro aerial vehicle (MAV) building a micro aerial vehicle (MAV) that is competition legal for the that is competition legal for the European Micro Air Vehicle European Micro Air Vehicle Conference and Flight Competition.Conference and Flight Competition.

Project Scope and NeedsProject Scope and Needs

OperationOperation SpecificationSpecification

Flight TypeFlight Type Flapping WingFlapping Wing

Flight TimeFlight Time 10mins10mins

Ground ClearanceGround Clearance 5m5m

Flight DistanceFlight Distance 50m50m

Degrees of FreedomDegrees of Freedom 33

Size SpecificationsSize Specifications 10cm x 10cm x 10cm10cm x 10cm x 10cm

WeightWeight 100g100g

Ease of OperationEase of Operation 1 user1 user

Design InspirationDesign Inspiration

The Delfly inspired design was chosen as our flapping wing The Delfly inspired design was chosen as our flapping wing MAV because of its ability to meet our customers needs and MAV because of its ability to meet our customers needs and has the highest probability to fulfill our design criteria and has the highest probability to fulfill our design criteria and complete all necessary functions.complete all necessary functions.

Gear Train and Wing Gear Train and Wing MechanismMechanism

DimensionsDimensions

– IncludesIncludes DrivetrainDrivetrain

WingsWings

FuselageFuselage

Connection rods Connection rods

Wingtip speed vs. body mass

Wing length vs. body mass

Wing loading vs. mass of man made objects

Wing CalculationsWing Calculations

Lift and thrust as a function of wing area

Stiffness effect on wing lift performance

U=forward flight speed

Φ=total flapping angle

f=flapping frequency

b=wing span

Motor SelectionMotor Selection

Voltage RPM Current (free) Current (stall)

1.5V 10100 12.4mA 36.8mA

3.0V 20300 17.6mA 73mA

5.0V 32500 - -

– Tiny Pager MotorTiny Pager Motor by by SolarboticsSolarbotics

– Diameter = 4mm (0.158”)Diameter = 4mm (0.158”)– Length = 16.4mm (0.65”)Length = 16.4mm (0.65”)– Shaft Diameter = 0.66mm Shaft Diameter = 0.66mm

(0.026”)(0.026”)– Weight = 1g (.035oz)Weight = 1g (.035oz)

Gear Size CalculationGear Size Calculation

– Nylon Gears will be used to minimize weightNylon Gears will be used to minimize weight

– Frequency will need to be 35HzFrequency will need to be 35Hz

– Gear Ratio taken to be 4.81:1Gear Ratio taken to be 4.81:1

Great Planes ElectriFly 4Ch FM Rx 72MHz

Futaba FM Receiver Crystal Short R114F 72MHz High

Hitec Eclipse 7 7-Channel FM/4

Component SelectionComponent Selection

Battery: 110mAh 1S 3.7V LiPo: BMCX

Servos:

- The servos for the control surfaces of the MAV would need to be very tiny, and are not commercially available.

- Piezo-electrics were researched, but would require more power than we could supply.

Component SelectionComponent Selection

Wing Material SelectionWing Material Selection

- McMaster Polyester (PET) FilmMcMaster Polyester (PET) Film - Thickness: .001“Thickness: .001“- Width: 40“Width: 40“- Length: 10' Length: 10' - Tensile Strength: 28,000 psiTensile Strength: 28,000 psi- Clear, No Tint, Weather ResistantClear, No Tint, Weather Resistant

““Bones” Material SelectionBones” Material Selection

Weight Carbon Tube Carbon Rod Aluminum Wire Steel Wire

Price for 48” .2 4 3 2 1

Length .1 3 3 2 1

Volume .4 1 2 4 3

Tensile Strength .2 2 2 4 1

Stability .2 1 1 3 3

2.1 2.3 3.6 2.3

- McMaster Rigid Carbon Fiber Shape Round McMaster Rigid Carbon Fiber Shape Round TubeTube

- OD: .125“OD: .125“- ID: .074" ID: .074" - Length: 48" Length: 48" - Tensile Strength: 120,000 psiTensile Strength: 120,000 psi

Cost AnalysisCost Analysis

ObjectObject Purchased FromPurchased From AmountAmount PricePrice

Tiny Pager MotorTiny Pager Motor SolarboticsSolarbotics 11 $4.95$4.95

Transmitter:Transmitter:

Hitec Eclipse 7 7-Channel FM/4Hitec Eclipse 7 7-Channel FM/4Towerhobbies.comTowerhobbies.com 11 $239.99$239.99

Receiver:Receiver:

Great Planes ElectriFly 4Ch FM Rx Great Planes ElectriFly 4Ch FM Rx 72MHz72MHz

Towerhobbies.comTowerhobbies.com 11 $24.99$24.99

Battery:Battery:

110mAh 1S 3.7V LiPo: BMCX110mAh 1S 3.7V LiPo: BMCXHorizonhobby.comHorizonhobby.com 11 $10.99$10.99

Polyester (PET): .001” - 8567K12 Polyester (PET): .001” - 8567K12 McMaster-CarrMcMaster-Carr 11 $22.00$22.00

Rigid Carbon Fiber Shape Round Rigid Carbon Fiber Shape Round Tube, .125" OD - 2153T31Tube, .125" OD - 2153T31

McMaster-CarrMcMaster-Carr 11 $12.18$12.18

TOTAL:TOTAL: $315.10$315.10

11 Rudder used for TurningRudder used for Turning

22 Rudder used for increasing/decreasing Rudder used for increasing/decreasing pitchpitch

33 Top WingTop Wing

44 Bottom Wing with rod attachment Bottom Wing with rod attachment pointspoints

55 Base Frame structureBase Frame structure

66 MotorMotor

77 GearGear

88 Rod linkagesRod linkages

99 Pinion GearPinion Gear

1010 Rocker / Wing HolderRocker / Wing Holder

ConclusionConclusion

Part Part QuantityQuantity DescriptionDescription

LR RudderLR Rudder 11 Used for TurningUsed for Turning

UP RudderUP Rudder 11 Used for increasing/decreasing pitchUsed for increasing/decreasing pitch

Top WingTop Wing 22 Made of Mylar and RodsMade of Mylar and Rods

Bottom WingBottom Wing 22 Made of Mylar and Rods, includes rod attachment pointsMade of Mylar and Rods, includes rod attachment points

FrameFrame 11 Base StructureBase Structure

MotorMotor 11 Mechanical MotionMechanical Motion

GearGear 11 Speed reductionSpeed reduction

Rod LinkageRod Linkage 22 Connects gear to wingsConnects gear to wings

Pinion GearPinion Gear 11 Attached to motorAttached to motor

RockerRocker 22 Holds wings in place and pivots about the frameHolds wings in place and pivots about the frame

BatteryBattery 11 Provides powerProvides power

ActuatorActuator 22 Controls ruddersControls rudders

ReceiverReceiver 11 Recieves commands from controllerRecieves commands from controller

ControllerController 11 Controls MAVControls MAV

Bill of MaterialsBill of Materials

Future PlansFuture Plans

– Purchase MaterialsPurchase Materials

– Finalize researchFinalize research

– Find Torque on the ShaftFind Torque on the Shaft

– ResizingResizing

– Find appropriate ServosFind appropriate Servos

– Finalize Design Calculations Finalize Design Calculations

– Finalize Manufacturing PlansFinalize Manufacturing Plans

Questions?Questions?