AP_Motors: MotorsHeli_Single utilize an explicit type cast to avoid the loss of a fractional part.

libraries/AP_Motors/AP_MotorsHeli_Single.cpp

@@ -512,7 +512,7 @@ void AP_MotorsHeli_Single::servo_test()
 
     if ((_servo_test_cycle_time >= 0.0f && _servo_test_cycle_time < 0.5f)||                                   // Tilt swash back
         (_servo_test_cycle_time >= 6.0f && _servo_test_cycle_time < 6.5f)){
-        _pitch_test += (1.0f / (_loop_rate/2));
+        _pitch_test += (1.0f / (_loop_rate / 2.0f));
         _oscillate_angle += 8 * M_PI / _loop_rate;
         _yaw_test = 0.5f * sinf(_oscillate_angle);
     } else if ((_servo_test_cycle_time >= 0.5f && _servo_test_cycle_time < 4.5f)||                            // Roll swash around
@@ -523,7 +523,7 @@ void AP_MotorsHeli_Single::servo_test()
         _yaw_test = sinf(_oscillate_angle);
     } else if ((_servo_test_cycle_time >= 4.5f && _servo_test_cycle_time < 5.0f)||                            // Return swash to level
                (_servo_test_cycle_time >= 10.5f && _servo_test_cycle_time < 11.0f)){
-        _pitch_test -= (1.0f / (_loop_rate/2));
+        _pitch_test -= (1.0f / (_loop_rate / 2.0f));
         _oscillate_angle += 8 * M_PI / _loop_rate;
         _yaw_test = 0.5f * sinf(_oscillate_angle);
     } else if (_servo_test_cycle_time >= 5.0f && _servo_test_cycle_time < 6.0f){                              // Raise swash to top