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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › gyro will not hold tail
07-28-2012 07:54 PM  8 years ago
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spurs

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ok city

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gyro will not hold tail
I have a 450 trex se with fut gy 401 and s 9257 rudder servo, and it will not hold the tail, it hovers fair but drifts right and if you apply pitch very fast the tail make a 360 in a ccw direction. the gain is 90% in hh and no tail wag.Thanks for the help.
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07-28-2012 08:47 PM  8 years ago
l4rg0

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Northfield, KY - USA

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Do you get full pitch in both directions when the model is static?

Sounds like either you are bindi g somewhere, or don't have your tail servo centered
Team A Main Hobbies/ProTek R/C
Spartan Avionics Field Rep
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07-28-2012 09:45 PM  8 years ago
spurs

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ok city

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I guess is was not centered. Thanks !
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07-28-2012 09:52 PM  8 years ago
Solmanbandit

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Tucson , AZ

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Sounds like your setup is messed up. Let's take this one step at a time.

What radio are you using?

Is the yellow wire plugged into the gear port of the receiver?
Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2
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07-28-2012 09:57 PM  8 years ago
wrongler

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Brewerton, New York

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Check the tail grip bearings.Bill Whittaker
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07-29-2012 05:37 AM  8 years ago
dkshema

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Cedar Rapids, IA

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This is a cut/paste from another thread where I responded to in the past, it contains 401 specific setup instructions.

You have a 450 heli, I will assume you are using a 6-channel receiver.

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As mentioned in an earlier post, by the way, make sure the tail rotor hub, grips, bearings are all sound and put together correctly. The entire Tail Rotor control system must be as friction-free and as easy to move as you can get it.

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Then:

Mechanically, things are simple. With the servo centered at neutral, the TR pitch slider is centered in its travel range. The servo arm is vertical. Adjust the pushrod as necessary.

The pushrod supports need to be adjusted on the tail boom so that the pushrod has as straight a shot as possible to the bellcrank that runs the pitch slider, and so that the pushrod moves as freely as it can.

Set up your gain controls so that the 401 initializes in HH mode, this is a MUST, to always start the 401 in HH mode. The 401's red LED will be on solid if you do this correctly. If it's blinking slowly, you didn't start up in HH mode. Fix that before proceeding.

Your gyro's gain lead has to be plugged into channel 5 of your receiver to work correctly (if you are using a six-channel receiver). Then make sure your TX is setup to control the gyro from channel 5. If not, fix that before proceeding.

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If you transmitter has REVolution Mixing and/or ACCeleration Mixing, DISABLE THEM, or dial them to ZERO.

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ATVs -- the endpoint settings on your transmitter are set at 100%. The ATV setting will eventually be used to set the desired yaw rate (piro rate), and nothing else.

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Set your RUDDER TRIM in ALL FLIGHT MODES to NEUTRAL. Don't touch the rudder trim tab again. Leave it at neutral in all flight modes. NEVER adjust the rudder trim AFTER you have initialized the gyro in HH mode. To do so will confuse the gyro and it won't work correctly.

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Set the TRAVEL LIMIT on the gyro to 100% for starters. Set the delay on the gyro to zero. DELAY is used with slow servos to fine tune the gyro response.

The travel limit adjustment is used to keep your TR servo linkage from mechanically binding at full rudder command. With the 401, you can't adjust the left and right full travel limits individually, the final travel limit setting is a compromise.

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The following steps work best if you switch to rate/normal mode so that the servo follows the stick commands and returns to neutral when you let go of the rudder stick.

Pick a hole on the servo arm that will allow you to achieve the following conditions:

1. Travel limit adjustment ends up as close as possible to 100%, at least no less than 100% without the pitch slider coming up against a mechanical stop at full left/right command.

2. The servo arm moves at least +/- 45 degrees from neutral for full left and right rudder command.

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At this point, you've got at least +/- 45 degrees of servo travel from neutral, the TRAVEL LIMIT setting is near 100%, but not less than 100%. Your pitch slider is centered at neutral, the servo arm is vertical at neutral, your ATV settings are at 100%, and DELAY is set to ZERO. Your gyro initializes in HH mode every time you start up your radio system.

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Your rudder stick causes the boom mounted TR pushrod to move FORWARD for RIGHT rudder. If not, reverse the rudder channel in the TX menu.

The GYRO direction switch (REV/NOR) is set so that if you pick the heli up and turn the nose to the LEFT, the boom-mounted TR pushrod moves forward. If not, reverse the gyro using the Nor/Rev switch on the gyro body.

This gets the rudder stick and the gyro acting in the proper direction.

The DS switch on the gyro is ON.

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Turn on your radio and make sure the 401 initializes in HH mode. After it does, switch to Normal/rate mode, fire up your heli, and bring it to a hover. If the heli wants to yaw left or right at hover, land, and ADJUST the mechanical linkage until the heli will hover in rate/normal mode without wanting its nose to go left or right.

Recheck and fine tune the TRAVEL LIMIT adjustment so that you don't get mechanical binding, if you had to adjust the linkage at all.

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Switch back to HH mode.

Start with your gain setting around 65%. Fly the heli and adjust the gain setting as required for your heli.

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If you find that you want a FASTER piro rate, INCREASE the RUDDER ATV value. If you find that you want a SLOWER piro rate, DECREASE the RUDDER ATV value.

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If you are using a Spektrum or JR radio in your heli, make certain that you bind the RX with the transmitter set to select Heading Hold mode for the gyro. This is an absolute must, to insure that the gyro is seeing the correct gain/HH setting while the TX and RX are linking up at power on.

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This should take you a long way towards getting your gyro to work well, and your heli to fly as it was intended to fly.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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07-30-2012 09:35 PM  8 years ago
Richardmid1

rrProfessor

Leeds, England

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Easier to sell the 401 and get a different gyro than read all that! 60% of the time, it works every time!
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07-30-2012 10:22 PM  8 years ago
doorman

rrProfessor

Sherwood, Arkansas

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💎Sustaining Member
+1 For 401 Complete Set Up..
dkshema has that info nailed...it is much easier to do then to read!!! I have been using 401's for a LONG time...really easier then most others out there in my book.. but again I am used to them...
From re-reading the original post, I am thinking that his head speed is too low, so that the pitch is getting in prior to the motor power... any idea what the hs is??? Or list your throttle cuvre settings along with your pitch curve settings...

Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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07-30-2012 10:33 PM  8 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Easier to sell the 401 and get a different gyro than read all that!
Funny thing is, with perhaps the exception of making sure the gyro is initialized in HH mode, the rest of the stuff should be done no matter WHAT gyro you are about to install. Proper setup is just that -- proper setup.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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07-31-2012 06:50 AM  8 years ago
Richardmid1

rrProfessor

Leeds, England

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Yeah I was only messing.

Just seems alot when you see it written down! It makes you understand why learning to fly an rc helicopter is so difficult! Thanks to the Internet its now so much easier to learn about this stuff. That's why nowadays people who have only been flying a few months can do 3d! Go on a sim all you want if your model isn't setup right you will struggle.
60% of the time, it works every time!
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08-02-2012 01:28 AM  8 years ago
dkshema

rrMaster

Cedar Rapids, IA

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seems alot when you see it written down!
Cut and paste is my friend.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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