Micro Power reduction under load

[Eggy 71]

I have an issue that is appearing on my cfx 180. It appears to spool up fine and flies nice. After a minute or so once I put a hard load on it, the heli seems to slow to 60% throttle or so even though I'm in stunt mode at 90% throttle. It will not increase until I land cut the throttle. It then spools up again like nothing ever happened. Anyone have a thought on what's causing this?

 

[Tony]

Sounds like the batteries are a little flat. That or you have some bearings that are a little tight. Take the main gear off or the pinion off the motor and see how free it spins.