Best gyro for 3D

[zenndium]

Hello!
I have baugt the GY-401 with a s9254 servo (if it isn't good enough - or how to spell it - i'll just use it in my vario uh-1d) I have some truble with the servo (it gives a bad sound) I have tryed everything and it won't go away
I have a Futaba T9CP (FF9-Super) and the "gyro sens" program :
Mode->GY
Mix->Act
Rate-up->(how many %?)
Down->(how many %?)
SW->F
Somebody please help me to set it correct.
The gyro's got 0 Delay and 60 Limit (minimum-std)
Please help im kind of new in futaba gyro's

[DavidH]

In the gyro program. The up and down is refering to the position that Switch F is currently positioned.

Rate up ( for example lets say you have 45% set in that rate) that would be the sensitivity of the gyro when the switch in the up position.

Down, same as above except the sensitivity would be what it is set for switch in down position.
Set the precentage about 45-50% in each switch postion and go fly.

It is perfectly normal for the 9254 to make a buzzing or high pitch whining sound.
You need to worry when the servo is not making the sound.

[zenndium]

Allright!
How about the gyro?
I mean the Delay and the Limit, is that correct?

[DavidH]

The delay is correct for using the 9254 servo.
The LMT is what sets the travel of the tail rotor pitch slider. Just adjust the LMT till the slider is just slightly binding at full deflection both directions.

You did get instuctions with the GY 401/9254 didn't you?

David

[Laurens]

Is this your first digital servo? The "bad" sound you hear is the buzzing because its constantly seeking its center point.

[zenndium]

Jep its my first digital servo. I use 9202 servos :cool:
Hov do i find the center point for the servo? If i take off the servo arm the "bad sound" is gone! I think the GY-401 manual isn't so good.
DavidH-> I have tryed to find to center like a million times but i can't find it :?

[DavidH]

If the monitor LED lights, the gyro is operating in the AVCS mode.
When the power is turned on in the normal mode, the monitor LED
will display an alarm by flashing intermittently. Set the sensitivity
switch to the AVCS position and turn on the gyro power again.
Set the transmitter gyro sensitivity switch to the AVCS position and
turn on the transmitter power, then turn on the gyro power (shared with
receiver). Since the GY401 initializes the data when the power is
turned on, set the rudder stick to the neutral position and do not move
the helicopter for approximately 3 seconds.

Next, switch the transmitter switch to the normal gyro mode position
and check the linkage.

In the rudder neutral position, connect the linkage
so that the servo horn and control wire are perpendicular

Move the rudder stick to the left and right, and check the direction of
operation of the tail rotor. If the tail rotor rotates in the wrong direction,
adjust the direction with the transmitter reverse function.

Section 4 Page 2 of the instructions. Yes when you take the arm off the servo the sound will get quieter. This is due to there being no load on the servo .
The GY 401 manual is fairly simple to understand from my experiences.

David

[zenndium]

Allright i don't get anything :?
I'll wait untill i get down in the club

[DavidH]

What is there to not get.
Have the rudder trim in the neutral ( center) position on the transmitter.
Also all the rudder mixing in the transmitter needs to be inhibited.

Now turn on the power to the transmitter
Turn on power to the receiver and the gyro, when you turn on receiver power, gyro should power up.
Don't touch anything for 3 seconds and let the gyro initialize.
If the light is blinking on the gyro it is in normal mode. Flip the switch that controls the gyro on the transmitter the opposite direction than it is now. This would be switch F I believe.
Now turn off the receiver and the transmitter.
Now turn on Transmitter and reciever.
Don't touch anything for 3 seconds till gyro initializes.
Now the light (LED) on the gyro should be On all the time (AVCS mode)
Now flip the switch that controls the gyro ( Switch F) the opposite direction. Now the gyro should be in normal mode.

Now the servo should be centered in the neutral position. The servo arm or wheel can now be installed on the servo in the proper position and the linkage to the tail adjusted to the proper position.

David

[zenndium]

Thank's for helping me.
I'll try it now, and write back later!
The switch on the transmitter is switch F and both Rate-up and down is 47% is that correct?

[zenndium]

Cool :cool:
I figured it out! It was not so hard anyway :wink:
Thank you again David!