6/18/2023 0 Comments Nasa airfoil designThe wing’s pitching moment determines the aircraft’s forward CG limit. The steeper the curve, the farther aft the neutral point will remain. For a given set of parameters, the wing’s lift curve determines how far the neutral point moves forward as alpha increases. ![]() To combat this, the wing’s airfoil should have the steepest lift curve possible. ![]() This moves the neutral point forward and decreases the stability margin. The canard is a flapped airfoil and its lift coefficient (CL) increases at a faster rate than the wing as their angle of attack increases. In short, the following airfoil qualities had a major affect on pitch stability and CG range: A pattern developed in the aircraft’s response to different airfoils. Why would Burt specify an older, draggier airfoil for the Long-EZ? I learned the answer while investigating the Cozy wing using Airplane PDQ. The E1230 is a forward loaded, turbulent flow airfoil with higher drag than the GAW1. ![]() Burt then designed the Long-EZ in 1978 and selected the Eppler 1230 airfoil, which he also modified to reduce pitching moment. He modified the cusp to reduce its pitching moment, but the section remained a modern (at the time) laminar flow, high-lift airfoil. Airfoil Design “Airfoil optimization requires the application of science, intuition, and perseverance” When Burt Rutan designed the Vari-EZ in 1974, he selected NASA’s GA(W)-1 airfoil for the wing.
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