Wright Flyer Competition

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Wright Flyer Competition

• Commemorating 100 years of powered flight

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Introduction

• 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 Details

• Overall Specifications
• Component details
• Flight velocity estimates
• Engine selection

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Overall 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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Wing
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Wing (contd.)
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Flight velocity estimates

• Only wing contribution to lift assumed.
• From dynamic similarity considerations with
  actual flyer and 1/8 model 15.57 m/s
• From vortex-lattice method for 3-D lifting
  surfaces (Cl0.62) 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 mechanism
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Canard
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Propeller Mounting

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Rudder
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Base Plate
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Take off and landing

• Tricycle type under carriage.
• Ramp assisted take off

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Power Plant selection

• Engine selection and calculations

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Engine selection

• cD 0.2 (NASAs 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 Selection

• RPM 4000
• Based on the above correlation and a forward
  speed of 16 ms-1 PR 1.7BHP.
• Engine Model O.S. MAX-65LA

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O.S. MAX-65LA
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Engine 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 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 base
• No. of ribs in wing reduced from 37 to 21

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Control System

• Futaba Skysport 4VF airplane radio system
• Four actuator servos for control surfaces
• Centrally mounted on base plate
• Control surface coupling via piano wire

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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 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 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

• 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

• How do we carry out flight testing without on
  board power?
• Landing mechanism?
• Design for knock down