Interim Design Review Group 13 – Flapping Wing MAV NASA Parker Cook George Heller Joshua Nguyen Brittney Theis

The Customer - Dr. Shih - Funding to be provided by the NASA Ames facility

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

Project Scope and Needs OperationSpecification Flight Type Flapping Wing Flight Time 10mins Ground Clearance 5m Flight Distance 50m Degrees of Freedom 3 Size Specifications 10cm x 10cm x 10cm Weight100g Ease of Operation 1 user

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

Gear Train and Wing Mechanism

Dimensions –Includes  Drivetrain  Wings  Fuselage  Connection rods

Wingtip speed vs. body mass Wing length vs. body mass Wing loading vs. mass of man made objects Wing 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 Selection VoltageRPMCurrent (free)Current (stall) 1.5V mA36.8mA 3.0V mA73mA 5.0V –Tiny Pager Motor by Solarbotics –Diameter = 4mm (0.158”) –Length = 16.4mm (0.65”) –Shaft Diameter = 0.66mm (0.026”) –Weight = 1g (.035oz)

Gear Size Calculation –Nylon Gears will be used to minimize weight –Frequency will need to be 35Hz –Gear 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 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 Selection

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

“Bones” Material Selection WeightCarbon TubeCarbon RodAluminum WireSteel Wire Price for 48” Length Volume Tensile Strength Stability McMaster Rigid Carbon Fiber Shape Round Tube - OD:.125“ - ID:.074" - Length: 48" - Tensile Strength: 120,000 psi

Cost Analysis Object Purchased From AmountPrice Tiny Pager Motor Solarbotics1$4.95 Transmitter: Hitec Eclipse 7 7-Channel FM/4 Towerhobbies.com1$ Receiver: Great Planes ElectriFly 4Ch FM Rx 72MHz Towerhobbies.com1$24.99 Battery: 110mAh 1S 3.7V LiPo: BMCX Horizonhobby.com1$10.99 Polyester (PET):.001” K12 McMaster-Carr1$22.00 Rigid Carbon Fiber Shape Round Tube,.125" OD T31 McMaster-Carr1$12.18 TOTAL:$315.10

1 Rudder used for Turning 2 Rudder used for increasing/decreasing pitch 3 Top Wing 4 Bottom Wing with rod attachment points 5 Base Frame structure 6Motor 7Gear 8 Rod linkages 9 Pinion Gear 10 Rocker / Wing Holder Conclusion

PartQuantityDescription LR Rudder 1 Used for Turning UP Rudder 1 Used for increasing/decreasing pitch Top Wing 2 Made of Mylar and Rods Bottom Wing 2 Made of Mylar and Rods, includes rod attachment points Frame1 Base Structure Motor1 Mechanical Motion Gear1 Speed reduction Rod Linkage 2 Connects gear to wings Pinion Gear 1 Attached to motor Rocker2 Holds wings in place and pivots about the frame Battery1 Provides power Actuator2 Controls rudders Receiver1 Recieves commands from controller Controller1 Controls MAV Bill of Materials

Future Plans –Purchase Materials –Finalize research –Find Torque on the Shaft –Resizing –Find appropriate Servos –Finalize Design Calculations –Finalize Manufacturing Plans

Questions?