Interim Design Review

1
Interim Design Review

• Group 13 Flapping Wing MAV
• NASA
• Parker Cook
• George Heller
• Joshua Nguyen
• Brittney Theis

2
The Customer

• Dr. Shih
• Funding to be provided by the NASA Ames facility

3
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.

4
Project Scope and Needs
Operation Specification
Flight Type Flapping Wing
Flight Time 10mins
Ground Clearance 5m
Flight Distance 50m
Degrees of Freedom 3
Size Specifications 10cm x 10cm x 10cm
Weight 100g
Ease of Operation 1 user
 
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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.

6
Gear Train and Wing Mechanism
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Dimensions

• Includes
• Drivetrain
• Wings
• Fuselage
• Connection rods

8
Wing Calculations
Wingtip speed vs. body mass
Wing length vs. body mass
Wing loading vs. mass of man made objects
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Stiffness effect on wing lift performance
Lift and thrust as a function of wing area
Uforward flight speed Ftotal flapping
angle fflapping frequency bwing span
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Motor Selection

• Tiny Pager Motor by Solarbotics
• Diameter 4mm (0.158)
• Length 16.4mm (0.65)
• Shaft Diameter 0.66mm (0.026)
• Weight 1g (.035oz)

Voltage RPM Current (free) Current (stall)
1.5V 10100 12.4mA 36.8mA
3.0V 20300 17.6mA 73mA
5.0V 32500 - -
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Gear Size Calculation

• Nylon Gears will be used to minimize weight
• Frequency will need to be 35Hz
• Gear Ratio taken to be 4.811

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Component Selection
Great Planes ElectriFly 4Ch FM Rx 72MHz
Hitec Eclipse 7 7-Channel FM/4
Futaba FM Receiver Crystal Short R114F 72MHz High
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Component Selection

• 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.

Battery 110mAh 1S 3.7V LiPo BMCX
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Wing Material Selection

• McMaster Polyester (PET) Film
• Thickness .001
• Width 40
• Length 10'
• Tensile Strength 28,000 psi
• Clear, No Tint, Weather Resistant

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Bones Material Selection

• McMaster Rigid Carbon Fiber Shape Round Tube
• OD .125
• ID .074"
• Length 48"
• Tensile Strength 120,000 psi

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
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Cost Analysis
Object Purchased From Amount Price
Tiny Pager Motor Solarbotics 1 4.95
Transmitter Hitec Eclipse 7 7-Channel FM/4 Towerhobbies.com 1 239.99
Receiver Great Planes ElectriFly 4Ch FM Rx 72MHz Towerhobbies.com 1 24.99
Battery 110mAh 1S 3.7V LiPo BMCX Horizonhobby.com 1 10.99
Polyester (PET) .001 - 8567K12 McMaster-Carr 1 22.00
Rigid Carbon Fiber Shape Round Tube, .125" OD - 2153T31 McMaster-Carr 1 12.18
TOTAL TOTAL TOTAL 315.10
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Conclusion
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
6 Motor
7 Gear
8 Rod linkages
9 Pinion Gear
10 Rocker / Wing Holder
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Bill of Materials
Part Quantity Description
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
Frame 1 Base Structure
Motor 1 Mechanical Motion
Gear 1 Speed reduction
Rod Linkage 2 Connects gear to wings
Pinion Gear 1 Attached to motor
Rocker 2 Holds wings in place and pivots about the frame
Battery 1 Provides power
Actuator 2 Controls rudders
Receiver 1 Recieves commands from controller
Controller 1 Controls MAV
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Future Plans

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

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Questions?