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Old 06-13-2010, 02:37 AM   #1 (permalink)
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Default Aurora 9 - Gain Setting T-Rex 250 with GP750 Gyro

I have a T-Rex 250 SE here that was flown on a Spektrum DX6i. This little heli does sweet 3D with DX6i gyro gain of 59.5%. It can do 60.0% and maybe 60.5% with a bit of wag. Yes, its a very narrow range but it works very well. But most 250's at the field are like this too.

So what is the DX6i 59.5% gain translated to in the Aurora-9 (A9)? Everything else on the 250 is the same -- only the radio system changed.

At the untouched gyro end point of [+100, -100], I set the A9's gain rate2 to 0%. I'm using single mode. That's the lowest heading hold you can go on the A9 but the little 250's tail wags like crazy? I'm I left with setting the gyro gain with end points here? Looks like it!

The gain value is just a scalar value (like all channels). I can't believe the A9 makes this one channel so complicated! Spektrum's system straighforward mapping to the gyro sense but A9 is off in its own little world here.
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Old 06-13-2010, 05:51 AM   #2 (permalink)
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The easiest way to setup the A9 gyro is as follows:

Gyro screen:

Mode = Dual
Rate 1 = XX / T.lock = HH mode (XX = % gain)
Rate 2 = YY / Nor = Rate mode (YY = % gain)

Assign an unassigned switch so you can toggle between the too. If you want to get fancy when selecting the switch you will see "Adjust function" - this allows you to setup a slider or one of the RT/CT/LT's to adjust gain in real time - ie. hovering.

Unlike the spectrums which use >50% gain for HH mode , <50% for rate mode with some % increase per unit.. E.G so if you spectrum gain setting is 65.. the actual HH gain setting is (65-50) * 1.4 = 21 gain - (Note: im not sure of the exact value you need to multiply by to get the correct gain, i suggest you check with the spectrum guys)..

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Old 06-14-2010, 11:55 AM   #3 (permalink)
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Quote:
Originally Posted by Geffect View Post
The easiest way to setup the A9 gyro is as follows:

Unlike the spectrums which use >50% gain for HH mode , <50% for rate mode with some % increase per unit.. E.G so if you spectrum gain setting is 65.. the actual HH gain setting is (65-50) * 1.4 = 21 gain - (Note: im not sure of the exact value you need to multiply by to get the correct gain, i suggest you check with the spectrum guys)..

.
Thanks. So I see you're providing and offset (-50) and then some scaling factor (1.4). But how does one determine the key value here which is the scaling factor?

Just had a brainwave last night: there may be way I can acurately determine what the scaling factor would be. Is there a device I could plug into a receiver's outputs and view a number representing the value coming out of that channel? With this device, I could see what value is coming out of my Spektrum 6100's gyro channel. With that number in hand, I can now plug the device into the gyro channel of my Hitec Optima receiver and then on the A9 adjust the gyro sensitivy value until I see the exact number on the device connected on the Optima's gyro channel.

I almost crashed my T-Rex 250 SE with this new A9. I did all my gyro calibrations on the ground and got no wag. But when I rolled my 250, it wagged like crazy. Just barely managed to recover by leveling out and switching out of idle-up. My A9 almost caused me to crash!
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Old 06-14-2010, 01:22 PM   #4 (permalink)
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Just figured out something. I can just rig up a mechanical channel sensor by plugging in a servo on my gyro gain channel and put a very long arm or arm extension on it to get a precise reading.
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Old 06-18-2010, 04:56 PM   #5 (permalink)
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On my Aurora 9 with the Trex-250 model selected I have a gyro screen like this :

Mode : Single
Rate1: 59%

I am using the Futaba GY-520 gyro.
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