611 SERIUS PROBLEM

[fgcity]

I just bought the new 611 Gyro and was flying just fine, doing piruettes and stuff, then in the normal hover just suddently lost control of the yail and it started rotating by it selve .

What could be the problem here? i really need to get this fixed.

[BarracudaHockey]

Did you examine your tail linkage, when something similar happened to me the carbon rod had split and the threaded rod was pulling out of it.

Also how much gain are you running?

[fgcity]

the linkages (after the crash were fine, nothing came out).

I had it on AVCS mode and the gain was at 77.

PS: when i was flying in normal mode the Gain was at 77 (100 on the transmitter)and everything was fine, the problem happened when after i flipped the switch to 3D mode, there i had 70 on the transmitter (50) on the Gyro.

Could this be the problem? the Gain was low ? i mean is 50 low for this type of gyro?

[BarracudaHockey]

Ah you probably fried your servo, max gain on that should be in the mid 30s

[fgcity]

but the servo is working now, it's operating fine.

PS: i have 5 cells on the hely not 4.

[WillJames]

What kind of TX are you flying?

[fgcity]

what do you mean? what's TX?

[WayneBrown]

what transmitter?

[fgcity]

Sanwa RD6000

[fgcity]

Anyone ?

[fgcity]

so what happened and the gyro stopped responding? it's the Gain was too high? i mean if the gyro has gain that high why shouldn't it work in that condition? i mean the Futaba Guys made the servo for that gyro so that was my problem?

It's allot of money to buy a new servo so i just want to be sure

[DavidH]

PS: i have 5 cells on the hely not 4

Here is the specifications for the GY 611

GY611 Ratings
Display device: 8-character dot matrix liquid crystal display
Operating voltage range: DC 3.8V to 6.0V
Current drain: 70mA (@5.0V, including sensor)



If your using a 5 cell pack that is nicad or nimh. That is a 6 volt pack. When it is fully charged, the voltage is in the mid 7 volt range up to 8 volts. So if your not regulating the voltage to 6 volts or less with a regulator. Your putting excess voltage to the gyro and the tail servo with the battery your using.

If you want to use the 5 cell pack to control the electronics. You must regulate the power to the tail servo to less than 6 volts.

Specs for the 9256 servo.
FUTM0226
Volts Torque Speed
4.8V 47 oz-in. 0.06 sec/60°
6.0V n/a n/a

Dimensions Weight
1.6 x 0.79 x 1.4 in. 2.01 oz.


David

[fgcity]

so basicly i burned my servo? is this for Certain?.

[fgcity]

what type of batteries i should use and what do you guys use?

[fgcity]

anyone?

[poerqwa]

I would definately put a voltage limiter / regulator in place.
I've been running 2 setups 1 on 5.3 and 1 on 5.6 V regulated for 2 years without problems.

Try the search option on "regulator"

[fgcity]

i know how to regulate the power, the question is Is my servo burned or can i still use it? It's working fine now at home

[Phaedrus]

Ah you probably fried your servo, max gain on that should be in the mid 30s

This keeps floating around and has become accepted as fact. However, people should know that a fairly significant number of folks run 601/611 gyros at very high gain with no observable problems.

Many of the Team Futaba FAI pilots run gain up around 75% and more with no problems with burning up servos. I have been running a 611 with gain set at 70% for hover and 50% in flight and my servo is not even warm when I land.

Point is that while this has become the accepted truth, there is a fair amount of data that contradicts it.

[DavidH]

The above is true to a certain extent.
On my F3C heli. I run the gain on the 601/9251 at about 75% in hover mode and about 50% in aerobatic mode.

On my sport heli that I bang around with. I run the gain at about 40% in all modes.

The F3C is being flown straight and level most of the aerobatic segment of the schedule. There is some rolls, flips and pirouettes. But they are not being done continously. So the gain can be run a little more sensitive.

As for sport heli, I am not what some would call a hardcore 3D flier. I am between stick banger and finesse flier when it comes to sport flying. So I run the gain considerally lower on the sport heli because the tail is receiving more abuse.

I am a Futaba Team pilot. When a newbie or any sport flier ask me about gain settings on the GY series gyros. I tell them to set the gain in the 35-45% range. The GY series gyros hold very well at low gain settings. So there is really no reason to have the gain set 60-90% on sport flying helis. It is just abusing the servo and shortening the life.


David

[BarracudaHockey]

I would summarize by saying you have a combonation of two problems.

1. You are running much more gain than you need.
2. You are running at a higher voltage than you need and or is reccomended.

So if you didnt burn up the servo I would be shocked.

Back the gain off to what you need to fly and get a voltage regulator in the 5.1 to 5.3 range.

[Phaedrus]

I am a Futaba Team pilot. When a newbie or any sport flier ask me about gain settings on the GY series gyros. I tell them to set the gain in the 35-45% range. The GY series gyros hold very well at low gain settings. So there is really no reason to have the gain set 60-90% on sport flying helis. It is just abusing the servo and shortening the life.


David

Agreed. The point I am trying to make is that this magic 37% number that is out there really is not all that meaningful. People start to get the idea that running these gyros above 37% is a bad thing to do.

I tell people the same that you do. Run the minimum gain necessary to hold the tail. But don't obsess about what that number is. There is nothing magic about 37%. You are not going to fry your servo at 38% (or even 50% or 60%). But why run any higher gain than necessary??

[fgcity]

tnx guys for the info. I wanted to ask also what batteries should i use? how many cells how much voltage and how much Ahm?

And should i get the 5.3 Voltage regulator or 6V regulator?

Also , my servo is working now but as you guys say it's burned so it will not function properly if i lower the gain now and lower the voltage? I mean there is no chance that the new servo just overheated and stopped responding and if i run it under normal conditions it would be ok or i should buy a new one? I just want to be sure if i am going to spend extra 100$

[DavidH]

If it has quit working at one time. There is definitely something wrong with the servo. I personally would not use the servo again in the heli till it was checked out by a service center.

You can read some on the site below.
http://www.duralitebatteries.com/

This is the batteries and regulators I use in my helis.

David

[Phaedrus]

Is it possible that the system voltage dropped and the gyro reset causing the tail to spin??

[fgcity]

when i was moving the Rudder Stick at home very fast at one point on the LCD there was "----" what is this and why does it happen , how do i fix it?