hope someone can help me figure this out.
Ever since the 4.02 beta the heli will lose power in flight then go right into soft start, I lose no other controls, no over reving of the motor, no rpm or power surges. I'm running in Gov. mode set rpm.

the second one is just a close up of the power loss area.

Looks to me like it hit the current limiter. Set current limiter to Insensitive and soft cutoff. Also add current to the data log.

V4 and higher have lower voltage cutoff so you might want to decrease the cutoff voltage.
Also soft cutoff on voltage.

Make those changes and give it another try.


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my voltage cutoff is at 36.6 and the current limiter is already set to insensitive. And soft cutoff as you said.
Here's the chart with current included
I log everything I just pasted screen shots with what I thought was relevant. As you can see current at that time was below 40%.
Thanks for your help!

How about more information.


What type of craft: airplane, helicopter, name, size, gearing, prop, blades, battery, and any other information. Set RPM mode so it’s probably a helicopter.


Exactly which ESC do you have? Are you using internal or external BEC?


You could always give Tech Support a call before they close today if you want a faster answer.


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Fusion 50
600mm mavrikk sport fbl
13t pinion
129t main @9.923
Ice 80hv
Scorpion 4025-550, 8 pole
SK 540 fbl
Futaba t8j sbus
Powered by a 6.6v Lifepo and two 6s 3600 mah Turnigy batts or 2 6s 3300 Storms.

This looks pretty strange, it reminds me of another post that had a strange plot.

I think in that case it turned out the pinion was slipping.

If that happens, the motor load goes to basically zero, and you can see those strange undershoots in motor rpm and load.

So at least check that.

Interesting point. On the other side of that coin, make sure the one-way bearing isn't slipping (could result in similar symptoms).

One Way clutch may be slipping.

I believe that in both of those cases you get a motor power output spike which results in the esc shutting down. which I'm not seeing. I'll double check those anyway just to be sure.

Originally Posted by neoalchemist74

I believe that in both of those cases you get a motor power output spike which results in the esc shutting down. which I'm not seeing. I'll double check those anyway just to be sure.

Why would you get a spike, the load is dropping, not increasing?

Pinion, might as well be welded on and I can't make the one way bearing slip short of breaking a tooth. I've got a new esc coming Monday so I'll see for sure after that. I've had a pinion slip b-4 and I got a very audible motor rev b-4 the esc shut down. this time is different. No sound change just one second its motoring along normally the next its like I hit throttle hold then about two seconds later it starts to ramp back up. Anything else I should check while I've got the motor off?

Originally Posted by Alan Hahn

Why would you get a spike, the load is dropping, not increasing?

in Governor mode wont the esc raise power in an attempt to maintain rpm.

Have you tried a different battery? I once had a problem with a battery that had an internal cold solder joint.

It has happened with both my sets off packs. and actually I'm in the process of replacing all of my connectors. Ill let you know if that helps, maybe a bad solder jt of mine.

Originally Posted by neoalchemist74

in Governor mode wont the esc raise power in an attempt to maintain rpm.

No, the rpm the governor is controlling is the motor rpm, not the head rpm. If something is slipping in the power train, the ESC has no clue about that.