Wright Flyer Competition Commemorating 100 years of powered flight
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
Design Details Overall Specifications Component details Flight velocity estimates Engine selection
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 (Cl=0.62) :11.75 m/s • Stall speed (W/S = 45 Nm-2,cLmax = 0.9) Vstall= 9.0 ms-1
Take off and landing • Tricycle type under carriage. • Ramp assisted take off
Power Plant selection Engine selection and calculations
Engine 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.
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
Engine to Propeller coupling • Two props coupled to shaft via belt drive. • Pulleys on prop shafts to provide reduction.
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
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
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
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
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?
What we need to know… • How do we carry out flight testing without on board power? • Landing mechanism? • Design for knock down