Plane: change default loop rate for quadplanes to 300Hz

ArduPlane/Parameters.cpp

@@ -1383,5 +1383,11 @@ void Plane::load_parameters(void)
     // Load all auto-loaded EEPROM variables
     AP_Param::load_all();
     AP_Param::convert_old_parameters(&conversion_table[0], ARRAY_SIZE(conversion_table));
+
+    if (quadplane.enable) {
+        // quadplanes needs a higher loop rate
+        AP_Param::set_default_by_name("SCHED_LOOP_RATE", 300);
+    }
+    
     cliSerial->printf("load_all took %uus\n", (unsigned)(micros() - before));
 }