diff --git a/libraries/AP_Motors/AP_MotorsHeli_Dual.h b/libraries/AP_Motors/AP_MotorsHeli_Dual.h
index 1c56e07367..22b2d2502f 100644
--- a/libraries/AP_Motors/AP_MotorsHeli_Dual.h
+++ b/libraries/AP_Motors/AP_MotorsHeli_Dual.h
@@ -50,12 +50,6 @@ public:
     // calculate_armed_scalars - recalculates scalars that can change while armed
     void calculate_armed_scalars() override;
 
-    // has_flybar - returns true if we have a mechical flybar
-    bool has_flybar() const  override { return AP_MOTORS_HELI_NOFLYBAR; }
-
-    // supports_yaw_passthrought - returns true if we support yaw passthrough
-    bool supports_yaw_passthrough() const  override { return false; }
-
     // servo_test - move servos through full range of movement
     void servo_test() override;
 
diff --git a/libraries/AP_Motors/AP_MotorsHeli_Quad.h b/libraries/AP_Motors/AP_MotorsHeli_Quad.h
index 3a3292fa25..3644255b1c 100644
--- a/libraries/AP_Motors/AP_MotorsHeli_Quad.h
+++ b/libraries/AP_Motors/AP_MotorsHeli_Quad.h
@@ -37,12 +37,6 @@ public:
     // calculate_armed_scalars - recalculates scalars that can change while armed
     void calculate_armed_scalars() override;
 
-    // has_flybar - returns true if we have a mechanical flybar
-    bool has_flybar() const  override { return AP_MOTORS_HELI_NOFLYBAR; }
-
-    // supports_yaw_passthrought - returns true if we support yaw passthrough
-    bool supports_yaw_passthrough() const  override { return false; }
-
     // servo_test - move servos through full range of movement
     void servo_test() override;