Hi Igor:
Castle Set Rpm mode prefers that you be somewhere between 70% & 85% of max RPM capability.  At kV=1360 with 7.4V the max is something like 10,064 RPM max, so it will give warnings below about 7000RPM and above about 8500 RPM give or take a little.

I have successfully flown at 52% throttle, your friend is going to be around 42%.  I'd say give it a go...

BTW if you want to see how it generates the "red warning, just enter diferent values for kv.  THe "Too slow" warning should disappear for approx kv=810  setting,  the "too fast" should appear at about kv= 665 (I think..!)

Castle Set Rpm mode prefers that you be somewhere between 70% & 85% of max RPM capability.  At kV=1360 with 7.4V the max is something like 10,064 RPM max, so it will give warnings below about 7000RPM and above about 8500 RPM give or take a little.

Thanks Dennis, throttle % was the reason, not too low uncontrollable rpm (that's what I affraided of). I told him him to set lover voltage and warning dispaeared. So he set it back and tested governing without prop (just braking by fingers), it worked well. So everything is OK.



BTW .. this guy on video started last year and he already did whole program ... looks like indoors are good way (read safe = cheap way) to learn all fugures 

Igor

The pic below illustrates what I was trying to say. In the region to the left of the red line, increasing input power (top line or throttle) actually reduces prop power and slows the prop down. All of the throttle increase would go to heat (loss).  Although no one would ever operate with a motor in this region near full throttle, the CC esc probably does not know this. It is a somewhat ridiculous case. Unfortunately I have tried to operate motors at full throttle in this region with disastrous results.    

To explain this a little more the curves represent what happens at WOT ( wide open throttle ) under varying prop loads. The throttle and governor always reduce power from WOT. But if WOT is in the left portion of the curve the governor will not work. The green area in the graph shows the proper prop load to use with a given motor at WOT. When the motor is operated in this region the governor will work reguardless of motor speed. The only exception would be if the software is not designed to go below a certain speed.

I know this explanation leaves a lot to be desired. Its the best I can do for now.