damn i had to put sun glasses on to look at that prop. I've always like the m445, i ran it with a ul1 motor and my geico hit a recorded 47, could have been faster another day but only had gps in the boat a couple times. burnt up my ul1 motors so now im running the stock 1500 kv proboat motor with the 445, I just picked up a b225 to try. I believe it has46.7 mm diameter. As a side not did prather get bought out? I thought the b225 was a prater prop but it said hypermarine on the package i believe. try the x642 on 5s. I know that set up in my super vee was really fast. I also have an x 645 but have noticed the m prop to be faster so im gonna do some work on it to try and unleash some more high end speed. I have the 42x 55 one detounged and one not but i dont really run them so couldn't tell ya. Still wonder what happened to my x440/3
I have the x337/3 but it's pretty small, think i bought it for my super vee.
I think you should stay with the 642, good all around prop

I think you should stay with the 642, good all around prop
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