I normally use airfoils from 12 to 18 depending on the aircraft and drop down to about 10 thick for an extremely fast model. These airfoils have proven to be safe with few or no bad habits at reasonable wing loadings and can slow down nicely to land. Comparisons have been made with airfoils representative of the high-lift design philosophies of Liebeck, Wortmann and Selig. Most sport designs have airfoils in the range of 14 to 16 thick. Take a look at the CL/alpha plots for NACA00 (just two examples) and youll see that in both cases, the airfoil cant reach that high of a CL, even at CLmax. More reasonable, but still a little high for the NACA foils. The resulting airfoil has a maximum lift coefficient of 2.5 at a designed Reynolds number of 300,000 and shows that aft loading on an airfoil is conducive to high-downforce requirements and is a favorable design direction when considering airfoils for race car wing applications. CL W/ (0.5V2 S) Using that, you should get closer to 1.31 CL. The PROFOIL inverse design code was used to design a candidate airfoil exhibiting downforce maximized using aft loading at low Reynolds numbers. Unlike in aircraft oriented high-lift airfoil designs, pitching moment constraints can be circumvented for race vehicle wing designs and this allows for further design freedom in the quest for downforce. Click on an airfoil image to display a larger preview picture. The four-digit NACA airfoil is an airfoil shape developed by the National Advisory Committee for Aeronautics (NACA), the precursor to the National Aeronautics and Space Administration (NASA). Using a combination of inverse airfoil design techniques, rapid interactive analysis methods, detailed computational fluid dynamics (CFD) and wind tunnel testing, aft loading of an airfoil has been explored as a design direction for high-downforce airfoils for race car rear wing applications while ensuring performance sustainability across a wide angle-of-attack operating range. Airfoil database search (NACA 4 digit) Search the 1638 airfoils available in the databases filtering by name, thickness and camber.
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