I am not sure what I did but I noticed I am not getting the cut off (sag) in RPM a lap before the end of the flight.

Is that setting the FM9 or the Castle ESC?

I looked at the basic program for the Castle and it did not jump out at me. I think my timer is set for % of power so not sure if it is a option with that setting???

It is the FM-9.  1 second -0- throttle at end of the flight time followed by 5 seconds full throttle then cutoff.  I think it is built in and not a setting anywhere.

Ken

It is hard to hear especially if you're in a manuver. Doesn't bother me because I fly the pattern every time so I know it won't leave me hanging. If you're just going to do random stuff, maybe have a stop watch with you?

Thanks Ken,
Maybe I am just not hearing it. My wife thinks I do need hearing aids. 

Paul,
Playing around with a Phoenix Edge and FM-9 tonight without a prop on it sounds like the faster the motor is turning, the more pronounced the RPM drop is 5 seconds before the end of flight.  For example when I run at 9800 rpm, I can hear it when flying alone.  If there are people flying gas nearby, no chance.  I think that at 10000 rpm, the difference would be enough to be easily detected.  Set your timer to 1:00 and see what you can learn next time you are out.
John