Eppler 335 Camber Line Error

[benjaminmoulton]

Hello,

I am creating a wing using an airfoil file (simply for the dxf output) from airfoiltools.com. I am including my files here.

When I run it I get the following error:

Traceback (most recent call last): File "simple_wing.py", line 3, in wings = mx.Scene("wingscene.json") File "/home/ben/anaconda3/lib/python3.7/site-packages/machupX/scene.py", line 51, in init self._load_params(scene_input) File "/home/ben/anaconda3/lib/python3.7/site-packages/machupX/scene.py", line 111, in _load_params self.add_aircraft(key, airplane_file, state=state, control_state=control_state) File "/home/ben/anaconda3/lib/python3.7/site-packages/machupX/scene.py", line 292, in add_aircraft self._airplanes[airplane_name] = Airplane(airplane_name, airplane_input, self._unit_sys, self, init_state=state, init_control_state=control_state, v_wind=v_wind) File "/home/ben/anaconda3/lib/python3.7/site-packages/machupX/airplane.py", line 73, in init self._create_airfoil_database() File "/home/ben/anaconda3/lib/python3.7/site-packages/machupX/airplane.py", line 949, in _create_airfoil_database self._airfoil_database[key] = Airfoil(key, airfoil_dict[key]) File "/home/ben/anaconda3/lib/python3.7/site-packages/airfoil_db/airfoil.py", line 98, in init self._initialize_geometry() File "/home/ben/anaconda3/lib/python3.7/site-packages/airfoil_db/airfoil.py", line 293, in _initialize_geometry self._calc_geometry_from_points() File "/home/ben/anaconda3/lib/python3.7/site-packages/airfoil_db/airfoil.py", line 513, in _calc_geometry_from_points raise CamberSolverNotConvergedError(self.name, camber_error) airfoil_db.exceptions.CamberSolverNotConvergedError: The camber line solver for Eppler_335 failed to converge. Final error: 1.1074209973441599e-10

Eppler_335.txt Wing_inertia.zip

[corygoates]

You can overcome this by setting camber_termination_tol as a keyword argument in your Airfoil constructor. Just set it to 10e-9 or so.