there are no 4mm flex hex's available to fit a .098'' flex shaft.
Evgeniy Gromov sells them on his Ecomaster.torgg shop, he is a member here.
Having said that I recently twisted a .98 flex into a pretzel with a 2836 motor in a 450mm Mini Hydro that judging by your setup is probably little over half the weight, so I think .130 is more suitable for your needs.
3600kv is OK for 3s so you could run 1 more cell with your existing motor, ESC, and x430, or your existing X632 will give a big boost to the speed at the expense of runtime and more load on the flex, maybe run it while your flex lasts, then upgrade if and when it gives out.
4400kv on 2s will work with your X632 and 45A ESC.
A 28x45 motor is ample for a 19" boat.
A 45A ESC is enough for a 19" boat, adding cells would give it an easier time for a given speed though.
An X632 is IMO the best prop for a Mini boat if you prioritise speed and acceleration over runtime. X430 will gain you a fair chunk of runtime, but lose you a fair chunk of speed too. Anything in between isn't worth the compromise to me and I think you would be better off with one of those.
Leopards are great bang for the buck, I have raced several, and still race one, but good without taking the price into consideration is a push too far. They are pretty average motors at a less than average price. Neu, Lehner, Mega, Plettenberg, Kontronik, and some Tenshock motors are all more efficient, but cost more too.
What does it weigh RTR?
Have you tried 2s1p of your cells? You may be able to pick up some speed from the weight savings of running one of your batteries at a time rather than both as a 2p pack, or maybe it is too flighty, or just won't balance out at the lighter weight.
Paul Upton-Taylor, Greased Weasel Racing.
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