The Stock 1\8 Boat with No Mods and a balanced and sharpened prop will run just over 40mph on average. With a little Strut tweaking and some Print work on the bottom You can get up in the mid to high 40 mph range, removing the clutch will free up a few RPM and and a little more power to turn more prop so it will run more in the high 40's.
I would post some pics and vids of mine but I'm new to This forum and Can't Yet until I have a certian number of post's,,LOL,, I don't know How Many it just said A "Certain Number".
But you can check out My Youtube Channel,,(topspeedhobbies),, and look for the Black Widow Vids,,