GY611 problem

[MarkH]

After going over setup directions from both Finless and Nigel Brown, I am still having an issue with my GY611 allowing the nose to constantly but slowly turn left. I 've redone my whole tail setup three times and no change. I've played with the gain ( starting at 32 ) both up and down and no change. Even when turning the gain up to around 45, I do not get any twitching of the tail. Is it normal for the nose to continually but slowly turn left? Is it time to send it to Futaba to have them look at it?

[DebianDog]

When you turn the helicopter on let the helicopter sit for 10 more seconds after the servo centers. Does it still do it?

[MarkH]

Yes it does. I make sure each time that I follow the the proper start up steps including what you said and it still turns left.

[Anthony.L]

Did you switch in/out of AVCS mode 3 times real fast and see **** on the 611 screen? That tells the 611 to memorize neutral.

[MarkH]

I may have in the the past but not recently. I'll give that a try.

[MarkH]

I tried the switching in/out of AVCS and I am not getting the **** on the screen. My gain settings are 33 in A and I put in 33 in N. I went through the entire GY611 menu to verify my settings and I still can't get the **** to appear when switching modes from my transmitter.

[Anthony.L]

How fast are you switching, it's got to be like 3 times in one second. The gain should dissapppear and ready **** on the screen until you switch back into AVCS and stop.

[fogger]

Are you sure the switch on your transmitter is causing the gyro to switch between A and N on the gyro screen? It sounds to me like you are initializing the gyro in normal mode and are not able to switch to AVCS mode. (IE you can't get **** on the screen with your gain switch) If this is the case your mechanical setup would have to be just about perfect to prevent any drifting...

Remember that positive ATV on the gain switch is AVCS mode gain, and negative ATV is Normal mode gain. Nigel recommends in step 7 to return the gyro to "only AVCS" mode instead of CMT mode which lets you switch from normal to AVCS. If you did this you can't "re-zero" the gyro with the "flip the switch three times" method, but it should always be in HH mode... If you did not do this then you need to initialize the gyro with the TX in the AVCS (positive ATV) position of your gain switch. Like DD said, sometimes the gyro takes a few seconds to init even after your RX links up and all your other servs are ready to go, so don't touch the rudder stick on the TX until you are sure the gyro is initialized.

Or it might just be bad vibes... :) lol.
Enjoy!

-Fog

[OICU812]

not sure which transmitter you have but as said if you are not seeing **** than you must have your assigned switch inhibited or you do not have a switch deisgnated??, You should be able to toggle from non heading hold to heading hold with a designated switch. As mentioned surely sounds like you are starting in non heading hold, that would create your issue. You mention A and N, but seems strange. Like anthony said though, you might need to flick it quicker to. Keep us posted with your findings.

[Sonny]

Also. Is Tx trim set dead center. If after you already have the initial center memorized in the unit and latter find yourself making trim adjustments, you'll end up with similar simptoms. This happens with the 401 as well.

[MarkH]

Thanks for the input guys. I was not switching in/out of the modes fast enough and now I am getting the **** on the gyro. TX trim is centered and have not touched it. I will try to fly this evening and see what happens. Hey Fogger, I see we're neighbors. Hopefully we can get our machines together sometime and you can show me how little I know.

[alwallash]

I just finished my TREX 600 CF.
Stock T/R, metal upgrades to belt pulleys front and back.

On the second flight I had a little scare..the nose started drifting to the left uncontrollably.
After a few recoveries, I landed without damage.

After reading several posts, I suspected that the tail rotor bearings were locking up.

Took the tail rotor holders apart. (I did not do this during build but did check that were tight.. ).
The bolts holding the tail rotor blade holders were REALLY locktited in hard.
Found that the 3x8x3 bearings were "dirty" on the outside and "notchy".
Soaked in alchohol..no change.
Soaked for 12 hours in acetone...one bearing has no notchiness and the other is much better.

I believe excess locktite got into the bearings, causing the tail to lock up sporadically.
I am going to 1) spin the bearing while in acetone and see if the notchiness goes away completely.
2) replace the bearings.
I will fly it again this weekend and hope that this fixes the problem.
Al

[fogger]

Hey Mark, that would be cool. Where do you fly?

Anyway we all have lots to learn in terms of this hobby, it's way too complex for anyone to know everything; I certainly don't... :)

Alwallash, check out the new QuickUK tail for the rex, should be out anytime now.

-Chris

[MarkH]

Right now I'm still in the learning to hover process and am using our property. We recently got rid of the last of our horses so I've been working on my one acre of pasture to make it helicopter friendly. Last week almost brought tears to my eyes when my wife told me I was a freak after putting up a windsock.

[bullaculla]

Ha ha! the wind sock and heli pad is cool! :thumbup:
Wish I had that much space to fly my heli :bawl

[fogger]

She clearly doesn't understand heli-addiction. We need help man, lol. There must be a 10 step program or something :)