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Old 09-23-2013, 10:41 AM   #1
GunnyJeeves
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Default Turnigy 9XR Heads Up for High Rates

Recently ran into an issue that I thought was brown out related.

Turns out, it was on the models I had messed with the throws on.

If I altered the limits to 125% (max) and did something like punch throttle, plus full aileron, rudder, and elevator, it acts like about a 2 second brown out. This is probably causing some kind of radio error in the firmware and may depend on your subtrim settings.

It is the first setback I have experienced with the 9XR and I still love these radios.

The problem came up on my Inverza and Yak 54. No crash or damage, but I was boosting the throws all I could on those models. This issue went away when I set the throw back to 100%.

Happy flying!
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Old 09-23-2013, 12:15 PM   #2
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Have you simulated the problem on the ground? It could very conceivably actually be a brown out caused by voltage drop to the Rx when you move all the servos to their limits simultaneously.


Also check carefully that you aren’t stalling the servos due to the over travel. This is quite easy to spot, just make sure that the servo keeps moving freely with stick input and it doesn’t lock out before the stick reaches full travel. This is something to watch for when you start driving servos over 100% throw, especially with digitals because they pull very high current when stalled and will quickly bring down your BEC.
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Old 09-23-2013, 01:41 PM   #3
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Always a bad idea to overdrive any servo especially if the servo is linked / mixed with another control. It is very easy to hit stop and servo stall out - drawing heavy current ....

It's best to go back to fundamentals and use the mechanical set-up to get more throw.

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Old 09-23-2013, 01:53 PM   #4
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You must realize also that 100% travel in ER9X (which is the firmware a 9XR runs) is equivalent to about 120% on Spektrum or Futaba. When you enable extended travel, you can stall some servos.

It's never too late to have a happy childhood.
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Old 09-24-2013, 02:18 PM   #5
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Originally Posted by pmullen503 View Post
You must realize also that 100% travel in ER9X (which is the firmware a 9XR runs) is equivalent to about 120% on Spektrum or Futaba. When you enable extended travel, you can stall some servos.
That makes sense. It explains why I fell so hard for this radio too! I fly aerobatic and 3d planes and they fly better with the 9xr than my spektrum radios. I like throws

My extreme flight was the one I did this on first, but also umx beast ( no issue ) 540qq, and Inverza both with issues.

The difference there is linear servos in the beast.

I will revisit the limits before flying again. That's really good info to know that 100% is like 120 in other radios.

Overall, I still love this radio.
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