Now what is the compensation factor on FM9

[Paul Taylor]

Ok got the throttle comp mode set but what is the comp factor? Default is 15. 15 of what?

[Dave Rigotti]

15 is the max compensation to account for voltage drop as battery discharges.  Remember I said 85% was MAX throttle allowed...The "15" can be considered the remaining difference to 100%.

Just set it to about 10 for first flights. Time lap speed 1 minute in and about 1 minute left. Adjust up if later lap speed is slower, adjust down if later lap speed is higher.

Of course the throttle "percent" establishes the actual desired lap speed.

Ok got the throttle comp mode set but what is the comp factor? Default is 15. 15 of what?

[Paul Taylor]

Thanks again!!!

[Douglas Bykoff]

Sorry to ask, but with so many very cheap ESCs with helicopter Governor function that maintain the model's speed even with the battery voltage drop and that you can adjust the P-Gain and I-Gain to give the motor a gain in maneuvers, is this compensation function still necessary?

Douglas.

[Brent Williams]

Just use a Castle ESC and run the FM-9 in HI-Gov mode.  Easiest solution.

If you want to run cheaper or non-Castle ESC's, use a Climb/Dive timer or a KR Timer.

[Douglas Bykoff]

Just use the Castle ESC and run the FM-9 in HI-Gov mode.  Easiest solution.

If you want to run cheaper or non-Castle ESC's, use the Climb/Dive timer or the KR Timer.

I'll go further, not just the easiest solution but the best solution. It allows you to fly at slower lap times without losing power at the top of maneuvers and without shooting up on descents.

In Sport models I use a passive timer with RF remote control made by myself and Chinese ESCs with Hi-Gov that are really cheap and work very well.

The ZMR ESCs with BLHELI firmware cost from 10 to 20 dollars for the 30 and 40A models and the YPG/YEP/ICE between 15 to 25 dollars both with Hi-Gov, brake, slow start, etc.

The advantage of using Hi-Gov is not only to compensate for the battery voltage drop during flight, but when doing maneuvers it maintains the motor power when required in the maneuvers  and if you use batteries with a high discharge rate it is even better. The difference is like water and wine.

Today the price no longer justifies using ESCs without the Governor function.

Douglas