From e0b8931501bd2bf9f1989cd4b237aad740a5b1ee Mon Sep 17 00:00:00 2001
From: Peter Sharpe <pds@mit.edu>
Date: Thu, 4 Apr 2024 17:47:47 -0400
Subject: [PATCH] adds logic that keeps airfoil coordinates counterclockwise
 even with scale_x<0

---
 aerosandbox/geometry/airfoil/airfoil.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/aerosandbox/geometry/airfoil/airfoil.py b/aerosandbox/geometry/airfoil/airfoil.py
index a7e09e08..7189ab4c 100644
--- a/aerosandbox/geometry/airfoil/airfoil.py
+++ b/aerosandbox/geometry/airfoil/airfoil.py
@@ -1420,13 +1420,26 @@ def scale(self,
         x = self.x() * scale_x
         y = self.y() * scale_y
 
+        if scale_x < 0:
+            TE_index = np.argmax(x)
+            x = np.concatenate([
+                x[TE_index::-1],
+                x[-2:TE_index-1:-1]
+            ])
+            y = np.concatenate([
+                y[TE_index::-1],
+                y[-2:TE_index-1:-1]
+            ])
+
         if scale_y < 0:
             x = x[::-1]
             y = y[::-1]
 
+        coordinates = np.stack((x, y), axis=1)
+
         return Airfoil(
             name=self.name,
-            coordinates=np.stack((x, y), axis=1)
+            coordinates=coordinates,
         )
 
     def translate(self,