diff --git a/ArduPlane/ArduPlane.pde b/ArduPlane/ArduPlane.pde
index bd1c059ca1..857695bdb9 100644
--- a/ArduPlane/ArduPlane.pde
+++ b/ArduPlane/ArduPlane.pde
@@ -483,7 +483,7 @@ static float	current_total1;
 ////////////////////////////////////////////////////////////////////////////////
 // Airspeed Sensors
 ////////////////////////////////////////////////////////////////////////////////
-AP_Airspeed airspeed(&pitot_analog_source, AIRSPEED_RATIO, AIRSPEED_SENSOR);
+AP_Airspeed airspeed(&pitot_analog_source);
 
 ////////////////////////////////////////////////////////////////////////////////
 // Altitude Sensor variables
diff --git a/ArduPlane/config.h b/ArduPlane/config.h
index d06528e327..7bfc81fcc1 100644
--- a/ArduPlane/config.h
+++ b/ArduPlane/config.h
@@ -115,18 +115,6 @@
 #endif
 
 
-//////////////////////////////////////////////////////////////////////////////
-// AIRSPEED_SENSOR
-// AIRSPEED_RATIO
-//
-#ifndef AIRSPEED_SENSOR
-# define AIRSPEED_SENSOR		DISABLED
-#endif
-
-#ifndef AIRSPEED_RATIO
-# define AIRSPEED_RATIO			1.9936		// Note - this varies from the value in ArduPilot due to the difference in ADC resolution
-#endif
-
 //////////////////////////////////////////////////////////////////////////////
 // IMU Selection
 //
diff --git a/libraries/AP_Airspeed/AP_Airspeed.cpp b/libraries/AP_Airspeed/AP_Airspeed.cpp
index bc6ad0e310..8def149969 100644
--- a/libraries/AP_Airspeed/AP_Airspeed.cpp
+++ b/libraries/AP_Airspeed/AP_Airspeed.cpp
@@ -38,7 +38,7 @@ const AP_Param::GroupInfo AP_Airspeed::var_info[] PROGMEM = {
     // @DisplayName: Airspeed ratio
     // @Description: Airspeed calibration ratio
     // @Increment: 0.1
-    AP_GROUPINFO("RATIO",  3, AP_Airspeed, _ratio, 0),
+    AP_GROUPINFO("RATIO",  3, AP_Airspeed, _ratio, 1.9936),
 
     AP_GROUPEND
 };
diff --git a/libraries/AP_Airspeed/AP_Airspeed.h b/libraries/AP_Airspeed/AP_Airspeed.h
index abb1f8b1a7..75628a216a 100644
--- a/libraries/AP_Airspeed/AP_Airspeed.h
+++ b/libraries/AP_Airspeed/AP_Airspeed.h
@@ -13,14 +13,8 @@ class AP_Airspeed
 {
 public:
 	// constructor
-	AP_Airspeed(AP_AnalogSource *source, float ratio, bool enable) {
+	AP_Airspeed(AP_AnalogSource *source) {
 		_source = source;
-		_offset.set(0);
-		_ratio.set(ratio);
-        
-        // by default enable but don't use the airspeed sensor
-		_use.set(1);
-		_enable.set(enable?1:0);
 	}
 
 	// read the analog source and update _airspeed