diff --git a/Systems/a320-aerodynamics.xml b/Systems/a320-aerodynamics.xml
index 57ca0392..eecf1ddb 100644
--- a/Systems/a320-aerodynamics.xml
+++ b/Systems/a320-aerodynamics.xml
@@ -424,7 +424,7 @@
 				<property>aero/qbar-psf</property>
 				<property>metrics/Sw-sqft</property>
 				<toradians><property>hydraulics/rudder/final-deg</property></toradians>
-				<value>0.2653</value>
+				<value>-0.2653</value>
 			</product>
 		</function>
 	
diff --git a/revision.txt b/revision.txt
index f26ee355..65521e78 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-4806
\ No newline at end of file
+4807
\ No newline at end of file