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 |
| avdpdf.f90 | source code for the program that makes avd.tex |
| avd.tex | LaTeX source code for pdflatex, making avd.pdf |
| avd.pdf | revised Appendices for Abbott and von Doenhoef |
| 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 for 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) |
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
If you want to use the 1996 NASA program, unzip airfols.zip and keep the *.h files in the same directory as airfols.f90. When you compile airfoils.f90, the header files will automatically be included.