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Home✈️Aircraft🚁Helicoptere-AlignOther › weird 401?
10-08-2005 11:13 PM  13 years ago
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rrApprentice

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weird 401?
i was wondering if its normal for when u initialize the gyro, for the servo to scream to one direction max? then come back to center?
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10-08-2005 11:19 PM  13 years ago
Hellijunky

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sounds about right everything but the scream part, that is..
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10-08-2005 11:21 PM  13 years ago
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rrApprentice

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well, i dont hear any binding noise, but it moves the control horn pretty far, so binding at tail can occure i guess, just kinda weird, for it to pull all the way. One more thing i noticed, my tail servo control is not equal to my rudder stick movement, meaning that i can move my rudder stick to 1/2 left, and its already at max servo left, how can i fix this?
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10-08-2005 11:24 PM  13 years ago
Hellijunky

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disconnect the servo horn after you initialize then recenter it
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10-09-2005 12:04 AM  13 years ago
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rrApprentice

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no no, the servo centers completely after initializing. Im talking bout during the initializing, the servo control horn will go in one direction max, then center after initializing.... IS the going in one direction max okay, cause im worried bout binding. And also is there anyway to correct the stick to servo throw?
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10-09-2005 01:09 AM  13 years ago
Hellijunky

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im no expert but here is what works for me, i start it up in avcs mode the light flashes real quick,then goes solid then the servo will push the pitch slider all the way to the right "no screaming" just a slow easy move,then i switch to non avcs mode the red light goes complety out and the pitch slider recenters itself
from there all i have to do is apply throttle and she goes straight up holding a perfect heading according to my last input.. ialways use non avcs mode to fly and it always seems to work fine for me
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10-09-2005 06:09 PM  13 years ago
Coolpowered

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Youngstown, ohio

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What servo are you using?YRCHA CLUB MEMBER
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10-09-2005 06:24 PM  13 years ago
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rrApprentice

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im using the gws naro i think
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10-09-2005 06:25 PM  13 years ago
Ozydego

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Westerville, Ohio

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Have you centered the servo out of heading hold mode???.... It sounds to me like, the servo jumps to its centered position before the gyro finishes initializing, and the HH takes over and pulls it back. Do this... Take the gyro out of HH mode by putting the gain below 50%, then initialize it. If the servo is then not centered you know the problem, and then the jumping should quit... if its centered out of HH mode, I couldn't tell ya...But Honey, I can't live with just stock.....
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10-09-2005 06:26 PM  13 years ago
Ozydego

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Westerville, Ohio

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Sorry, what gyro are you using first of all.... if its a gy401, follow the procedure above to take it out of HH mode...But Honey, I can't live with just stock.....
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10-09-2005 06:29 PM  13 years ago
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rrApprentice

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oh, one more thing, the futaba gyro had a futbab connector for the servo, i kinda guess and checked the direction for my jr servo, the first time it didnt work, but the second time when i flipped the connector, it worked? is this partially y?
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10-09-2005 06:33 PM  13 years ago
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rrApprentice

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okay, lemme re phrase some things, since its getting kinda confusing. After initializing in both ASVC or NON-ASVC, the gyro centers the servo. The issue im worried about is during initializing, the servo will max to one direction throw, and stay there after initializing. The reason y im worried about this is cause im worried it'll cause binding and burn the servo out!.
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10-09-2005 06:34 PM  13 years ago
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rrApprentice

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oh, and i noticed that if this gyro is in ds mode, the servo doesnt like it =(, but seems to work fine
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10-09-2005 06:39 PM  13 years ago
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rrApprentice

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yea, servo is fine, tested with nother servo, does same exact thing. Is my connection correct?
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10-09-2005 07:45 PM  13 years ago
Chugga-bug

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London UK

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What TX are you using?
Have you got a switch to go between rate mode & HH?

Don't know what 'Ozydego' is talking about when he says,

"Take the gyro out of HH mode by putting the gain below 50%"

It's switchable from the tranny!

You can have your gain at 20% and still be in HH mode.

Reset all trims and sub-trims to centre on your Tx.

Then hover in rate mode and adjust 'mechanical' trim by moving tail

servo bacwards/forwards until it hovers without drifting.

Then flick HH switch on Tx 3 times within 1 second and your done!

Its that simple!
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10-09-2005 08:03 PM  13 years ago
Stack

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Bethlehem, PA

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Chugga.... you can set your gain to determine AVCS on or off. You just happen to use a switch.

From the 401 manual:

Relationship between transmitter sensitivity adjustment and gyro operation sensitivity and operation mode

The gyro sensitivity becomes zero when the transmitter sensitivity
switching signal is in the neutral position. The sensitivity can be
adjusted over the deflection width of the signal by operating in the
AVCS mode at the + side and in the normal gyro mode at the - side
of the neutral position.

When the transmitter has a gyro sensitivity switching function
(T9ZHwc Series, T8UHPS, etc.), and the transmitter GYRO setup
screen sensitivity setting is 50%, the GY401 gyro sensitivity becomes
zero. When the setting exceeds 50%, the gyro enters the
AVCS mode and the sensitivity becomes 100% at 100%. At settings
lower than 50%, the gyro enters the normal gyro mode and
the sensitivity becomes 100% at 0%.

When sensitivity setting is performed by transmitter switch channel,
AVCS mode and normal gyro mode switching is performed by
switch position. The sensitivity of each mode is set by the rudder
angle adjustment function (ATV, AFR, etc.) of the respective
channel. When the ATV or AFR set value is 90%, the gyro sensitivity
becomes 100%.
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10-09-2005 08:09 PM  13 years ago
Stack

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Bethlehem, PA

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Project: If you decide to start over with the 401 (which is what I do when it doesnt seem right). Check out this article:

http://www.coloradorotorheads.com/articles/401.htm
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10-09-2005 10:10 PM  13 years ago
Chugga-bug

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London UK

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Hmmmm...
I have to admit Idon't remember reading that in the instruction!(probably flew straight over my head!!)
But I'll take your word for it Stack!

What I don't understand, is that when I first flew my rex, I hadn't got the tail sorted as well as I have now, and I had to have the gain set to around 33% to stop the wagging. Yet there was still a difference between rate mode and HH.

How does that come about?

I should point out that this is my first heli, and I don't claim to be an expert
Just trying give a liitle assistance.
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10-10-2005 04:34 AM  13 years ago
Ozydego

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Westerville, Ohio

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Basically means that 0%-50% is actually 0-100% out of HH mode aka rate mode. 51%-100% is actually 0-100% in HH mode... I use rates of 85% for HH mode and 35% for rate mode... they both have the exact same gain of 70% as far as the gyro is concerned...But Honey, I can't live with just stock.....
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10-10-2005 12:55 PM  13 years ago
Stack

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Bethlehem, PA

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yup!

I have my tx programmed to be in HH for normal and idle 1 but if I feel like flying in rate mode I switch to Idle 2.

Works well for me.
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