Somethin Extra is a great plane just like it is but you can do some motifications and improve it some/not much. It need a OS 50 or equal to fly well. I flew mine with an OS 46 and 61 and it flew great with both. It is a great second plane if you have flown for about a year of fly with conficence. It will fly fast or slow. I am going to buld another one soon.