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HomeAircraftHelicopterHIROBOOther › The Proper Gyro Setting ?
12-07-2004 03:54 AM  13 years agoPost 1
tjongkristian

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Jakarta, INDONESIA

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Dear All,
I am a little bit confuse on the procedure to properly set up heading lock gyro in a heli. I have an EVO 50 with Futaba 401 for the gyro. How do I set it up properly? Do I just follow the 401 instructions? Thanks.

Kris

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12-07-2004 05:27 AM  13 years agoPost 2
Garry-Boy

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Moscow, Russia

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What radio do you use and what servo you put on the rudder?

Garry.

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12-07-2004 05:52 AM  13 years agoPost 3
tjongkristian

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Jakarta, INDONESIA

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I am using a Futaha 9CHP and 9254 for the servo. Can you please show me the way step by step? What I did for the setup were making sure the servo horn is at the centre when in normal mode and position the tail pitch plate in the centre of the shaft. Thanks.

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12-07-2004 08:55 AM  13 years agoPost 4
Tomas Ahl

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Linköping, Sweden

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I followed the instructions about servo horn length and so on from the EVO instruction manual and then checked that I followed the 401:s setup instructions too.

I feel that I should also trim the setup so that my EVO hovers without pirouetting with the gyro in rate mode to really have the mechanical setup spot-on, right now I have a slow pirouette when switching to rate mode. But the heli flies great with the gyro in hh (AVCS) mode with the gyro set to 100% gain, no hunting/tail wagging at all so I haven't bothered yet. (One day I may get back to do this properly.)

(I have the same equipment 9CHP, GY401 and S9254.)

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12-07-2004 01:33 PM  13 years agoPost 5
Garry-Boy

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Moscow, Russia

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Radio
1) You should deactivate your Revolution mix on the radio for doing that go to advance menu, find there revolution mix function and switch it to INH
2) Than in advance menu go to gyro sens function and activate the mix. On the right corner of the screen of this function change the mode to GY.
Now what you got is the screen of the gyro sens which shows you exactly how your gyro understands the sensitivity of each gain.
As you know Futaba gyros got two modes AVCS (heading hold) and Normal. Put the cursor to first gain and rotate the joystick. You would see AVC or NOR inscription in front each gain.
Put first one to AVC 75% and the bottom one to NOR 75%
3) You could change the gyro sens switch, but by default it is “F” switch (it locates on the very left and bottom of your radio)
Gyro
1) Make sure that: the reverse switch is in reverse, you switched on the digital servo function, you put delay on 0.
2) Adjust with the limit knob the maximum travel for your rudder servo.

In Normal sens mode your rudder servo would always return to the center, so while adjusting the horn and stuff switch your sense to Normal.

Garry.

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12-07-2004 07:55 PM  13 years agoPost 6
daved26

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NJ USA

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check out this link....

http://www.raptortechnique.com/gy401-futaba9c.htm

then carefully read (and re-read) the instructions about adjustments made on your first few flights.

don't forget to always switch the 401 to HH before you turn on the receiver/gryo power supply.

hope this helps.

dave d

"I wish my 9C had a reset button"

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12-10-2004 12:28 AM  13 years agoPost 7
tjongkristian

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Jakarta, INDONESIA

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Thank you all for the help. I tried the procedure from the Raptor Technique site. I flew the heli yesterday doing some stall turns with 2-3 piroutte at each turn. The tail hold very solid, but when I landed the heli, I found that the servo was hot. Is it normal? Also, does the rudder stick movement range suppose to correspond to the pitch slider movement range? Thanks.

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12-10-2004 01:05 AM  13 years agoPost 8
Tomas Ahl

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Linköping, Sweden

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Also, does the rudder stick movement range suppose to correspond to the pitch slider movement range?
On the ground, not in heading hold/AVCS mode, in rate mode you should see rudder movement corresponding to the stick movement. In HH mode giving a rudder input the gyro will expect the heli to turn and on the ground when it doesn't the gyro will keep increasing the rudder command until it reaches the set limit.

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