Team USYD

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National Aircraft Design-Build-Fly Competition

• Team USYD

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Overview

• Design process
• Design reasoning
• Problems solving
• construction methods and specifications
• Flight test

DESIGN
BUILD
FLY
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Design Process
DESIGN
Rebuild
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DESIGN
Critical Specifications

• Blended wing/body aircraft
• 10 cc engine
• Remote controlled by human pilot
• Must carry payload of four Dick Smith Gravy
  packets (1.6kg total weight)
• Aspect ratio 2.0
• Project cost 1000

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DESIGN
Desirable Specifications

• Highest possible wing loading
• Minimum take-off weight
• Minimum planform area
• Stable flight in all conditions

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DESIGN

• Configuration studied
• Standard boxwing
• C-wing
• Closed box-wing

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Computational Design
DESIGN

• Solid Works airframe design, weight and balance
• Desktop Aerodynamics aerodynamic prediction
• Flight Sim flight simulation and performance
  estimation

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DESIGN

• Box-wing configuration advantages
• Minimal planform area
• End caps improve wing strength
• Fully effective upper wing surface
• less run way area

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DESIGN

• V-tail selected
• Ease of construction
• Comparatively light
• Tractor configuration
• Move C.G forward
• Propeller intake clear of wing interference

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INITIAL DESIGN
DESIGN
Aurora Mk I

• Upper wing constructed from ply spar and balsa
  ribs, surfaced with solar film
• Foam core lower wing surfaced with balsa sheet an
  solar film
• V-tail made up from balsa sticks and
  fibre-glassed to 12mm diameter carbon boom

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INITIAL DESIGN
DESIGN
Aurora Mk I

• Bulkheads fore and aft of payload made from light
  ply
• Firewall located and set at specific angle
  relative to wings
• Steel wire (3mm) folded and cut for undercarriage

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BUILD

• Detailed design and construction
• Detailed calculations were completed
• Design continually modified as practical
  problems arose during construction

Aurora Mk I
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BUILD
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Problems Faced and Fixed
DESIGN
PROBLEM Structural joints introduced weak points
SOLUTION Structure rebuilt with 61 ratio joints
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DESIGN
PROBLEM Weak materials
SOLUTION Tail boom replaced, aluminium plate
undercarriage
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DESIGN
PROBLEM Too large frontal area
SOLUTION Rebuilt fuselage with more efficient
payload configuration
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DESIGN
PROBLEM Wing area too small
SOLUTION Chord and span increased
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DESIGN
PROBLEM Fuselage not strong enough
SOLUTION Fibre-glassed fuselage surfaces
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DESIGN
PROBLEM CG too far forward
SOLUTION Moved controls to rear of fuselage Added
ballast to tail boom
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REVISED DESIGN
BUILD
Aurora Mk II

• Wings constructed by a hot-wire cut foam core,
  surrounded with balsa sheeting
• Spar laminated from 2 pieces of 3mm birch ply
  wood with carbon fibre between them
• V-tail of slightly increased area was
  fibre-glassed to a 7/8 diameter carbon tube

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REVISED DESIGN
BUILD
Aurora Mk II

• Wing/Body fillets sculpted from foam and
  fibre-glassed for strength and durability
• 1.5o right side thrust and 1.5o down thrust were
  built into the engine mount
• 4mm Aluminium undercarriage bought-off-shelf and
  re-shaped to suit aircraft

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Specifications
BUILD

• Span 1.4m
• Length1.5
• Area 0.58m2 (900in2)
• Mass4 Kg
• Engine Thunder Tiger 61 Pro (10c.c.)
• Servos 5
• Channels 5

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Test flight
FLY

• Pre-flight
• Ground Run Engine
• Adjust mixture

• First Flight
• Zero payload flight
• Adjust trim for straight flight

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Test flight
FLY

• Second Flight
• Confirm trimming
• Third Flight
• Confirm flight characteristics with payload
• Fuel consumption check
• Fly actual circuit

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DESIGN - BUILD - FLY
Thanks to all our sponsors
For more details, please visit our web
site http//www.aeromech.usyd.edu.au/RCplaneUSYD
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Finally, thanks for your attention!!
Please feel free to ask any questions about
our design
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