1 files changed, 18 insertions, 0 deletions
diff --git a/aircraftstudio/evaluator/drag.py b/aircraftstudio/evaluator/drag.py
new file mode 100644
index 0000000..73a26fc
--- /dev/null
+++ b/aircraftstudio/evaluator/drag.py
@@ -0,0 +1,18 @@
+import random
+
+def get_drag(aircraft, drag):
+    # Transform semi-span integer into list
+    semi_span = [x for x in range(0, aircraft.wing.semi_span)]
+
+    # Drag increases after 80% of the semi_span
+    cutoff = round(0.8 * aircraft.wing.span)
+
+    # Drag increases by 25% after 80% of the semi_span
+    F_x = [drag for x in semi_span[0:cutoff]]
+    F_x.extend([1.25 * drag for x in semi_span[cutoff:]])
+    return F_x
+
+
+def get_drag_total(aircraft):
+    """Get total drag force acting on the aircraft."""
+    return random.random() * 100