Thread: What causes this?

Hey.

This sounds like an overall gain or lock gain slider being too high on the cyclic gyros. This will give a behaviour similar to what you describe where the models fuselage almost appears to be wobbling under the rotor disk due to the gyros inputting to much corrective commands. This is the same as what would happen to the tail rotor if the gain was set too high and the tail starts hunting/wagging.

You're using a 3GX FBL controller, what firmware is it running at present?
If you are running V1.1 or V1.2, then my posted settings files for the 3GX will work well on the Trex500 also. These may also require slight gain adjustments, but will work much better than the stock settings.
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Whats your gains set to?

Thanks for the quick reply guys.
I did the build myself but the setup was done by the guy from the store and it all passed in a blur.
Where and how do I check the gain? I guess I am running v2.0 as it was only setup a couple of weeks ago, but again,
is there anyway to check?

There are two little white dials on the top f the unit. They should be around the 12 o'clock Ish position, maybe a little higher or lower depending on set up.

Also check your blade grips rotate smoothly when you remove the pitch links. I had a bit of bobbling on mine caused by a slightly binding blade grip

Hey.

If you connect the 3GX to the pc and open the software, it will show you the currently installed firmware along the top of the interface.
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Thanks both.
I'll check that out.
The gains on top of the unit are approx in the 12 o'clock and I'll connect up to the computer
and check the version.

normally in the 3gx units i have setup the elevator needs less gain

Spot on guys, I dialed back the Elevator Gain to 11 o'clock position and now it's perfect. Thanks all.