diff --git a/aerosandbox/aerodynamics/aero_3D/aero_buildup.py b/aerosandbox/aerodynamics/aero_3D/aero_buildup.py
index d4fd637f..35bfe74f 100644
--- a/aerosandbox/aerodynamics/aero_3D/aero_buildup.py
+++ b/aerosandbox/aerodynamics/aero_3D/aero_buildup.py
@@ -53,7 +53,7 @@ def __init__(self,
                  airplane: Airplane,
                  op_point: OperatingPoint,
                  xyz_ref: Union[np.ndarray, List[float]] = None,
-                 model_size: str = "medium",
+                 model_size: str = "small",
                  include_wave_drag: bool = True,
                  ):
         """