The NACA 4digit airfoil series is described by equations that use the maximum camber, position of maximum camber, and maximum airfoil thickness as variables. These three variables are given in the 4digit description. This video covers a basic definition of each of the four numbers (technically three), and then goes through the equations that are used to generate the (x,y) coordinates of the airfoil for use in plotting or simulation codes.

The next video in this series is a MATLAB code that implements the equations seen in this video, and will return a plot of the airfoil of your specification, as well as a text file with the coordinates. Here is the link to that video:

https://goo.gl/r6pK7f

For the MATLAB GUI code that I wrote, head over to my GitHub account, linked to here:

https://github.com/jte0419/NACA_4_Dig...

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Chord Length Video:
http://goo.gl/zIeO7u

References:
"Theory of Wing Sections", Abbot and von Doenhoff
http://www.amazon.com/TheoryWingSec...

http://airfoiltools.com/airfoil/naca4...

http://www.dept.aoe.vt.edu/~mason/Mas...