# What is the Reynolds number for this wing assuming flight speeds of 10m/s and 20 m/s?

Learning Goal: I’m working on a mechanical engineering discussion question and need an explanation and answer to help me learn.Consider a model airplane that has a rectangular wing with a span of 3.0 m, a chord length of 0.5m, (and therefore a total area of 1.5m2). Suppose it is to have a maximum mass of 10.0 kg. Assume standard sea level conditions in all of the following. a) What is the Reynolds number for this wing assuming flight speeds of 10m/s and 20 m/s? b) Special airfoils are needed to operate effectively at low Reynold’s numbers. Using http://airfoiltools.com, find two airfoils in the “Selig” family, that might be suitable for use in low Reynold’s number applications, one with low camber and one with high camber. • Download the coordinates of each of these airfoils, and then import these coordinates into Matlab. Use Matlab to plot each of the airfoil shapes on a single set of axes (i.e. both shapes should be superimposed atop each other). Use a legend to identify the designations of each airfoil on the plot. Be sure to use the “axis equal” command in Matlab so that the plot is a scale drawing of the airfoils, scaled equally in the horizontal and vertical directions. In your write-up, include information on the maximum thickness, maximum camber, and location of maximum camber for each airfoil.
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