.DAT to .DXF Converter

#plot_airfoil.py

# Desired chord length (mm)

CHORD = 200

# import necessary libraries for dxf conversion

import ezdxf

# Path to airfoil data file

import os

script_dir = os.path.dirname(os.path.abspath(__file__))

filename = os.path.join(script_dir, "..", "airfoil", "naca2412.dat")

#Open the file

with open(filename, 'r') as file:

    lines = file.readlines()

#Print every line

#for line in lines:

 #   print(line)

import matplotlib.pyplot as plt

x = []

y = []

with open(filename, 'r') as file:

    lines = file.readlines()

for line in lines[1:]: #Skip the NACA 2412 header line

    values = line.split()

    if len(values) == 2:

        x_coord = float(values[0]) * CHORD

        y_coord = float(values[1]) * CHORD

        x.append(float(x_coord))

        y.append(float(y_coord))

plt.figure(figsize=(8, 3))

plt.plot(x, y)



plt.axis("equal")

plt.grid(True)



plt.xlabel("x")

plt.ylabel("y")

plt.title("NACA 2412 Airfoil")



#plt.show()

# Remove the hashtag from the line above to plot the airfoil. The line is commented out to avoid opening a plot window when running the script in a non-interactive environment.

# ---

# Export airfoil to dxf file

CHORD = 200.0 #mm

#Scale coordinates to desired chord length

scaled_x = x

scaled_y = y



doc = ezdxf.new()

msp = doc.modelspace()

#Add polyline

msp.add_lwpolyline(list(zip(scaled_x, scaled_y)), close=True)

#Save file

script_dir = os.path.dirname(os.path.abspath(__file__))

output_file = os.path.join(script_dir, "..", "cad", "naca2412_200mm.dxf")



doc.saveas(output_file)



print(f"Saved to: {output_file}")