diff --git a/ArduCopter/config.h b/ArduCopter/config.h
index cd961e26424b11914845cdf996ff5a7423eb79e3..ee91206b0ecd478a265d861757ea195c581ebdf0 100644
--- a/ArduCopter/config.h
+++ b/ArduCopter/config.h
@@ -112,7 +112,11 @@
 
 // default RC speed in Hz if INSTANT_PWM is not used
 #ifndef RC_FAST_SPEED
-# define RC_FAST_SPEED 490
+# if FRAME_CONFIG == HELI_FRAME
+#   define RC_FAST_SPEED 125
+# else
+#   define RC_FAST_SPEED 490
+# endif
 #endif
 
 // LED and IO Pins