OK guys I will add stuff to this post as we go along, I'm ignoring any questions of what prop do I need on my set up,, For argument sake All model boat props were 2 blades in the 80's so when you wanted a 2 blade prop you asked for a 440-450-460-470- ect,,, now when the 3 blades came out or got discovered back then they became 440/3-450/3-460/3-470/3 ect,lets all get on the same page