HUH ! The small stuff is what causes problem's, If overlooked !
I'm just saying it is not what servo you run, it is more in the set-up! My AC Wildthing uses a standard servo for steering, runs over 50 mph and my mate borrowed it for State titles a few years ago and came second. Driving and set-up will get you there, what servo to run is all in your set-up. You are the only one that can detirmine your set-up so you need to decide what servo. I have seen plenty of guys run Hitec 805's in boats and wonder why their failsafe kicks in or their batteries go flat, over kill is as bad as under sized!
Specific servo's are just an Opinion, unless you post pics of your linkages you may as well be asking "how fast will my boat go"
