Moved GY401 gyro from top to bottom, now it wags and drifts

[dornier]

Hi everyone,

I moved my GY401 from the top to bottom on my 450X and the tail wags and drifts. I didn't think I needed to change anything, but the gyro is really acting up. I tried to reduce the gain in the radio for the gyro, but then it drifts nose right. After the first battery was done, I tried another battery with worse results. The tail wag was bad and it would pull the nose to the right and it was much work to keep the nose straight. By the way, when the gyro was on top, I had no problems with the gyro and/or servo.

Any ideas?

Thanks,

GP

Trex 450X with phoenix 35, (3) Spektrum DS285, Castle Creations BEC, JR DS3400G tail servo, Spektrum AR6200, Align 400S w/13T pinion

http://i22.tinypic.com/j0w8pj.jpg

[Windbreaker]

I wonder if having an ESC or BEC near the gyro might expose the gyro to a lot of electrical noise?

Dimension Engineering recommends keeping their BEC as far away from the RC receiver as possible. At least two to three inches. The Futaba gyro might be sensitive to electrical noise.

Finless Bob already mentioned the problem of having any gyro wires run near the main rotor bearings as the noise from those seem to cause problems.

Dean.

[dornier]

Hi,

Does it matter if I'm running a Spektrum receiver? If not, I will move the ESC as far as possible from the gyro.

Thanks,

GP

[Windbreaker]

Here's the thread about the gyro wires and the bearing blocks:

http://www.helifreak.com/showthread.php?t=47171&highlight=gyro+noise+interference

Dean.

Edit: Carefully read the documentation that comes with the gyro. On page 4, in the grey box, it states the gyro should be at least 10 cm from the electric motor. You also don't want anything conductive touching the case. And it's sensitive to electromagnetic noise. Lots of other precautions listed as well.

[Pinecone]

10 cm? That is 4 inches, hard to do on a mini. :)

But I agree get the gyro as far away as possible from the motor and ESC. Also make SURE that the gyro case isn't touching the frame. Vibration can also induce strange behaviour to the gyro.