changed basic thermal model, now realistic behavior

input/natural_constants.py

@@ -1,7 +1,8 @@
 g = 9.81        # local gravitational acceleration in [m/s^2]
+c_v = 3115.89  # [J/(kg * K)]
 R_air = 287.1   # Specific Gas Constant Dry Air in [J/(kg * K)]
 R_gas = 2077.1  # Specific Gas Constant Helium in [J/(kg * K)]
 R_E = 6378000   # Earth Radius in [m]
 e = 0.016708    # Eccentricity of Earth's Orbit
 sigma = 5.670374419 * 10 ** -8  # Stefan-Boltzmann-Constant
-gamma = 1.4
+gamma = 1.667  # 1.44 # 1.6