Unless you have stick experience with your Alpha, just use what came with it. It will fly just fine. The 3 blade prop allows you slower landings so you can practice them without undue stress. Sure, later on you can change the prop, and it will fly faster. It will also get a lot more acrobatic on you too when you do. I have 2 of them, one converted to a taildragger with the dihedryl taken out of the wing, and it is a fairly sporty aircraft. I get a lot of mileage out of mine, I hope you will also.