Hi Spence, if this is the same topic as last time, you should have already checked voltages and currents.
Furthermore, I also take it for granted that battery-esc-motor are suitable for each other.
I would also rule out the propeller as a problem because 25 mm certainly doesn't seem like an excessive diameter to me.
The problem seems to me to be of a mechanical nature (or at least the cause which then also led to an electrical problem I mean).
Since the joint broke (provided he translated and interpreted well) then the problem must be there.
Well it may be obvious but the joint under normal conditions should not break (in any case it should not break immediately).
In short, we accept a discussion of usury and super-exploitation but this is not your case.
I imagine that, before breaking, it could be stuck or blocked or otherwise run very badly with strong vibrations (if it is not homokinetic). This may have generated a overcurrent.
In theory (according to what I have learned in the latest topics on the use of fuses in brushless motors) the ESC should be able to intervene promptly and save the motor. Maybe there are some settings you don't know (but neither do I unfortunately).
But let's go back to the possible cause of the joint: why did it break?
To avoid interpretation problems (Google translates all "joints" the same way and doesn't make me understand anything) does your joint have one or two joints?
To avoid repeating the same things, I'll give you the link to the previous discussion on joints.
My message is number 24 (the part highlighted in red in the photo), perhaps it could be useful and interesting to you.
Bear in mind that I prefer perfect alignment between the propeller shaft and the drive shaft.
Misalignment can lead to problems that must be resolved effectively.
However, you who have your ship at hand look for other possible causes that have broken the joint, even trivial ones.
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