wright flyer competition commemorating 100 years of powered flight
TRANSCRIPT
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Wright Flyer CompetitionWright Flyer Competition
Commemorating 100 years of powered flight
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IntroductionIntroduction
The model to be made : a 1/8 scale model of the 1903 ‘Kitty Hawk’ Flyer.
Presentation will cover the following topics– Design details and deviations from original design.– Power Plant Specifications– Control System Implementation– Cost Estimate and future work
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Design DetailsDesign Details
Overall Specifications Component detailsFlight velocity estimatesEngine selection
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Overall SpecificationsOverall Specifications
Wing Span 1.5 m
Wing Chord 0.29m
Wing loading 45 Nm-2
Aspect Ratio 5.2
Wing planform area 0.44 m2
Take-off weight 2 kgs
Maximum forward speed 17.0 ms-1
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WingWing
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Wing (contd.)Wing (contd.)
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Flight velocity estimatesFlight velocity estimates
Only wing contribution to lift assumed.From dynamic similarity considerations
with actual flyer and 1/8 model : 15.57 m/sFrom vortex-lattice method for 3-D lifting
surfaces (Cl=0.62) :11.75 m/s
Stall speed (W/S = 45 Nm-2,cLmax = 0.9)
Vstall= 9.0 ms-1
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Wing Warping mechanismWing Warping mechanism
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CanardCanard
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Propeller MountingPropeller Mounting
``
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RudderRudder
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Base PlateBase Plate
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Take off and landingTake off and landing
• Tricycle type under carriage.
• Ramp assisted take off
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Power Plant selectionPower Plant selection
Engine selection and calculations
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Engine selectionEngine selection
cD = 0.2 (NASA’s wind tunnel data)
Power requirement for level flight PR= qSVcD = 0.135 BHP
Choice of engine based on propeller diameter scaling.
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Engine SelectionEngine Selection
RPM = 4000Based on the above correlation and a
forward speed of 16 ms-1 PR = 1.7BHP.
Engine Model O.S. MAX-65LA
41
2 8.2424500
velocityRPM
PD R
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O.S. MAX-65LAO.S. MAX-65LA
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Engine to Propeller couplingEngine to Propeller coupling
Two props coupled to shaft via belt drive. Pulleys on prop shafts to provide reduction.
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Deviations from exact scalingDeviations from exact scaling
Minor dimensions of structural members not scaled
Control strategy changed to suit servo actuation
A ‘base’ plate placed on lower wing to mount engine and actuators
Tricycle wheel baseNo. of ribs in wing reduced from 37 to 21
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Control SystemControl System
Futaba Skysport 4VF airplane radio systemFour actuator servos for control surfacesCentrally mounted on base plateControl surface coupling via piano wire
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Cost Estimate Cost Estimate
Balsa + miscellaneous
Rs. 5000
Engine Rs. 10000
Fuel tank Rs. 250
Silicone tubing Rs. 100
Radio system Rs. 25000
Propellers Rs. 300
Total estimated cost Rs. 40650
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Future PlansFuture Plans
• Mock up of thermocol• Wing construction • Canard, rudder and base-plate construction
as also struts and frame• Assembling fuel tank, r/c receiver, servos
and engine on the base plate
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Future PlansFuture Plans
• Attaching control servos to control surfaces• Integrating wing, canard and rudder with
the frame• Integrating base plate with frame• Testing for flight and change incorporation
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What we need to know…What we need to know…
How do we reduce the cost?Electric motor instead of IC engine What sequence should we follow in
building the model?Can we test individual components
separately before incorporating in the final model?
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What we need to know…What we need to know…
How do we carry out flight testing without on board power?
Landing mechanism?Design for knock down