I bought ft85cs esc. there’s problem with speed. I tried 13s and 20s battery the speed almost the same. I already move the erpm to the top(250000). what else the setting affect rpm or how to increase rpm?
Under what conditions do you see same speed?
No load free spinning in air?
Maximum Current settings, bad remote calibration for example
Please share the settings you have, the motor and propeller you use, etc. so we can properly help
6384 motor with 4.8inch folding prop. in water I tried 13s and 20 battery. the speed is almost the same, not enough on foil. there’s s
etting:
If you are running in water (under load) increased battery voltage will not increase RPM if motor current limit is the limiting factor. Motor current limit is effetively a torque limit. So if your propeller is to tough to drive that would limit your RPM in water no matter other limits. But I am not sure that is the case for you.
You also have 100A limit for both battery and motor current. Problably you should have significantly higher motor current limit. More then double motor current limit compared to battery current limit is not crazy with this type of motor (3-phase PMSM).
Which this specific motor I think 200A as motor current limit might be to much. I would actually guess that 100A should be decent at least. I do not know enough about this specific motor to say if 100 A is on the low end or high end. Or this specific propeller/motor combo.
1 Like
My thoughts too, at the same time keep the limits of the motor in mind…
Also, what speed are we talking about? You wont reach 50km/h with a 6384 motor before it burns up I reckon 
If it’s the Flipsky 6384 with the Flipsky prop, it is on the low end.
Works but you need decent foiling skill and no chop.
I would go to 120A minimum.
it;'s Flipsky 6384 with the Flipsky folding prop. the speed is slow not enough to pop up on foll. I think the motor rate at 80amp. I put 100amp is more than enough. I see people use 6374 6384 motor in this group. I wonder how you guys setup it?
Motor current is much higher than batterie current at low speeds. (I have a different motor, but also need more than 100A motor/phase current). Increasing to 120A made the difference for me. With 120A I can start in flat water but not against chop waves (crappy board hydrodynamics, 1050cm foil, 80kg). If no one is answering who uses the motor, I assume there is somewhere a thread with the settings people use. So KI search should find it.
Just to make sure, which foil size are you using and what is your weight?
Why do you ask for advice and then claim to know better?
Set motor amp to 120A for that motor/prop combo.
If you are not a good foiler already, set it to 140A or more.
1 Like
I would consider myself a rather good foiler, and anyway on one of my boards with an inefficient prop I need 160A from the 6384 to get out. So far it survived this current for brief intervals
Obviously that does not seem to be the case as explained above.
Rated current on a motor of this type is generelly not maximum current that is suitible.
Other people also already presented examples of them using more with your motor and propeller combo.
Current settings always depend on:
A) Prop
B) weight
C) Starting technic
D) Board
Believe or not, an inflatable e.g. sticks on water like hell and needs more current than a board with scharp edge at the back and a good shape.
Once gliding, smaller boards tend to need less power than bigger boards, i guess cause of surface tension.
Only my expierence