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The archive file naca456.zip contains the files:

readme.txt General description of naca456.
naca456.f90 the main program source code
nacax.f90 the source code to the module of auxiliary code
splprocs.f90 the source code for the spline procedures
epspsi.f90 the data module defining the epsilon and psi functions
avd.f90 the source code for the program that makes web pages in HTML with the data from Abbott and von Doenhoff
input.txt instructions for preparing input for naca456
ver6.zip the source code, instructions and examples as distributed in versions 1-6 of the PDAS CD-ROM. This includes source code from both of the Ladson-Brooks programs.
airfols.zip The source code and sample cases for Airfols, the 1996 NASA program
samples.zip a selection of test cases (input and output)
samplnx.zip all of the above test cases with Unix end-of-line (ZIP)

To compile this program for your computer, use the command

gfortran naca456.f90 -o naca456.exe

Linux and Macintosh users may prefer to omit the .exe on the file name. All of the auxiliary modules will be included automatically.

To launch the program, type


at the command line. This program asks for the name of the input file. This must be a file written as described in the file input.txt which uses namelist input.

The program produces a file called naca.out that printed or scrolled to your screen and a file called naca.gnu that may be plotted. Using gnuplot, you plot the airfoil shape with

gnuplot> plot 'naca.gnu' with lines

The default setting for gnuplot will expand the vertical scale to fit the screen. This is useful for seeing the curvature, etc. of the airfoil and I usually take a look at most airfoils with this expanded scale. But you probably want to see the airfoil in true proportions. Say

gnuplot> set size ratio -1

and you will get a short but wide window with the correct proportions.

Alternately, you may command

gnuplot> set yrange [-0.5:0.5] gnuplot> set size square

It is best if you compile the programs using your Fortran compiler with the appropriate options for your computer system. If you do not wish to do this, you may download naca456exec.zip containing the files naca456.exe, naca456.mac, and naca456.lnx, the executable program for Windows, Mac OS X, and Linux, each compiled generically for an Intel CPU.

If you download this program and find it useful, please make a contribution to enable Public Domain Aeronautical Software continue making open source software available to the engineering community. If you click on the button below, you may contribute $20 through the PayPal site.

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