Structural Design
Work has been done on structural performance of the Badgers canard. Using a combination of traditional theories such and Beam Theory and the latest in computer simulations such as the Finite Element Analysis module in I-DEAS we have predicted the Canard performance. Using FEA we have been able to find buckle modes, stress concentrations in both the main spar and skin as well as deflection of the canard under a 9g load. We have used a series of trade diagrams for help in optimization of the main spar in both bending and twisting performance.
Badger Canard
Velocity/Load Factor (V-n) Diagram
Before structural design work could be under taken the preliminary design work was completed. Using our previous general layout and aerodynamics data we began designing the structural components. The first area to receive serious attention was the Canard.
Beginning with the Canard dimensions and performance requirements we established a V-n diagram has been generated. This diagram shows the increase in obtainable load factor or "G-loads" with increasing velocity.
Once the loads expected during normal flight and maneuvering where understood we Chose materials and general structural layout. Many trade diagrams have been used to compare the various main spar configurations and materials available. The current spar configuration is a box spar made of carbon fiber as seen at the top of the web page.
FEA has been performed to predict deflection and failure loads. "Back of the Envelope" hand calculations have confirmed FEA simulations.
Box Beam FEA Simulation - showing buckle modes
Canard Skin FEA Simulation
