I've looked once again and can't seem to find the info I'm looking for. Why do certain props get used for certain projects? I see motors with suggested props but when it comes time for a project it says to use a different one. Why is that? Like the nutball suggests a 10" prop but why can't a 8,7 or 6 be used? I've broken my 10 & 9 inch props. I think I have a couple 6" left. Oh and is there a reason why it is said to have your motor running counter clockwise? I have a 8" and a 9" pusher prop sitting around, bought the wrong ones. Can they be used and just run clockwise?