team usyd national aircraft design-build-fly competition
Post on 19-Dec-2015
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Team Team USYDUSYD
National Aircraft National Aircraft Design-Build-Fly Design-Build-Fly
CompetitionCompetition
OverviewOverview
• Design process
• Design reasoning
• Problems solving
• construction methods and specifications
• Flight test
DESIGN
BUILD
FLY
Design ProcessDesign Process
Preliminary Design
Detailed design &
construction
Flight-testing
Rebuild
ConceptualDesign
Mission Requirements
DESIGN
Computational estimation
Computational estimation
– 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
Critical Specifications
DESIGN
–Highest possible wing loading
–Minimum take-off weight
–Minimum planform area
–Stable flight in all conditions
Desirable Specifications
DESIGN
DESIGN
•Configuration studied
– Standard boxwing
– C-wing
– Closed box-wing
Computational DesignComputational Design Solid Works – airframe design, weight and Solid Works – airframe design, weight and
balancebalance
Desktop Aerodynamics – aerodynamic Desktop Aerodynamics – aerodynamic predictionprediction
Flight Sim – flight simulation and performance Flight Sim – flight simulation and performance estimationestimation
DESIGN
DESIGN
Box-wing configuration advantages
– Minimal planform area
– End caps improve wing strength
– Fully effective upper wing surface
– less run way area
DESIGN
V-tail selected
– Ease of construction
– Comparatively light
Tractor configuration
– Move C.G forward
– Propeller intake clear of wing interference
INITIAL DESIGNINITIAL DESIGN
• Upper wing constructed from ply spar and balsa Upper wing constructed from ply spar and balsa ribs, surfaced with solar filmribs, surfaced with solar film
• Foam core lower wing surfaced with balsa sheet Foam core lower wing surfaced with balsa sheet an solar filman solar film
• V-tail made up from balsa sticks and fibre-V-tail made up from balsa sticks and fibre-glassed to 12mm diameter carbon boomglassed to 12mm diameter carbon boom
Aurora Mk IAurora Mk I
DESIGN
INITIAL DESIGNINITIAL DESIGN
Bulkheads fore and aft of payload made from Bulkheads fore and aft of payload made from light plylight ply
Firewall located and set at specific angle Firewall located and set at specific angle relative to wingsrelative to wings
Steel wire (3mm) folded and cut for Steel wire (3mm) folded and cut for undercarriageundercarriage
Aurora Mk IAurora Mk I
DESIGN
BUILD
•Detailed design and construction
– Detailed calculations were completed
– Design continually modified as practical problems arose during construction
Aurora Mk I
BUILD
DESIGN
Problems Faced and FixedProblems Faced and Fixed
PROBLEM
Structural joints introduced weak points
SOLUTION
Structure rebuilt with 6:1 ratio joints
PROBLEM
Weak materials
SOLUTION
Tail boom replaced, aluminium plate
undercarriage
DESIGN
SOLUTION
Rebuilt fuselage with more efficient payload
configuration
DESIGN
PROBLEM
Too large frontal area
front
PROBLEM
Wing area too small
SOLUTION
Chord and span increased
DESIGN
PROBLEM
Fuselage not strong enough
SOLUTION
Fibre-glassed fuselage surfaces
DESIGN
PROBLEM
CG too far forward
SOLUTION
Moved controls to rear of fuselage
Added ballast to tail boom
DESIGN
• Wings constructed by a hot-wire cut foam core, Wings constructed by a hot-wire cut foam core, surrounded with balsa sheetingsurrounded with balsa sheeting
• Spar laminated from 2 pieces of 3mm birch ply wood Spar laminated from 2 pieces of 3mm birch ply wood with carbon fibre between themwith carbon fibre between them
• V-tail of slightly increased area was fibre-glassed to a V-tail of slightly increased area was fibre-glassed to a 7/8” diameter carbon tube 7/8” diameter carbon tube
REVISED DESIGNREVISED DESIGN
Aurora Mk IIAurora Mk II
BUILD
Wing/Body fillets sculpted from foam and fibre-Wing/Body fillets sculpted from foam and fibre-glassed for strength and durabilityglassed for strength and durability
1.51.5oo right side thrust and 1.5 right side thrust and 1.5oo
down thrust were down thrust were built into the engine mountbuilt into the engine mount
4mm Aluminium undercarriage bought-off-shelf 4mm Aluminium undercarriage bought-off-shelf and re-shaped to suit aircraftand re-shaped to suit aircraft
REVISED DESIGNREVISED DESIGN
Aurora Mk IIAurora Mk II
BUILD
SpecificationsSpecifications
Span: 1.4mSpan: 1.4mLength:1.5Length:1.5Area: ~ 0.58mArea: ~ 0.58m22
(900in (900in22))
Mass:4 KgMass:4 KgEngine: Thunder Tiger 61 Pro Engine: Thunder Tiger 61 Pro
(10c.c.)(10c.c.)Servos: 5Servos: 5Channels: 5Channels: 5
BUILD
Test flightTest flightPre-flight
•Ground Run Engine
•Adjust mixture
First Flight
•Zero payload flight
•Adjust trim for straight flight
FLY
Test flightTest flightFLY
Second Flight
•Confirm trimming
Third Flight
•Confirm flight characteristics with payload
•Fuel consumption check
•Fly actual circuit
DESIGN - BUILD - FLY
For more details, please visit our web site:
http://www.aeromech.usyd.edu.au/RCplaneUSYD
Thanks to all our sponsors
Please feel free to ask any questions about our
design
Finally, thanks for your attention!!