I am not really a beginner as I have been flying for some years now. However I have always used the "recommended" prop for each engine. My question is this; If I want to play with prop size, what do I need to know. How do I know how much is too much? I understand the basics. More pitch = more bite, more length = more thrust. I guess what I am looking for is a formula or some thing of the sort so I know what numbers to look for.