UPDATED Speed Test results
Finally had time to run the x642 prop so I wanted to update my previous post with the speeds, if anyone is still curious on the differences see below. I believe I could raise the strut just a tad and pick up another mph but I am happy with it the way it is for now. However, I may try a M445 soon to see how it stacks up with the others.
Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day (except for the x642 test) and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and which one would be faster for me so I can fine tune the boat for maximum speed without blowing over.
Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.
x642 (DASBOATA) 44.3mph
Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log around one mph more than any batteries I use in this boat)
x442 s&b 43.1mph
x642 (DASBOATA) 45.4mph