Gyro servo

[mupchu]

I am sure someone can give a more technical answer, however

rate mote effectivly dampens the corrections that you need to make. It does not lock the tail in, only suggests . . . basically makes it easier to correct the tail. When flying in rate mode you will be correcting the tail yourself the whole time.

In HH mode the gyro locks the tail in. Properly setup a HH gyro should hold the tail in direction you put it until you move the rudder stick.

[widower]

Rate mode is good if you are just doing forward flight. The rate mode detects tail movements (say from the wind) and tries to adjust. If you want the tail to follow the helicopter while only in FF, then rate mode and you can pretty well keep your finger off the rudder.

Picture trying to throw a dart backwards. It will always flip around. Same in rate mode so don't even try reverse flight.

Old rate gyros were a motor spinning a small flywheel and a pendulum was held centered by springs. If you moved the tail with your hand, the rotational force on the flywheel caused the pendulum to swing one direction or the other and hall effect sensors detected the direction of swing and would create an output to the tail servo.

As mupchu mentioned, heading hold reacts kind of like a compass. Point the heli in one direction, and theoretically it will lock in that direction until you command it differently. Good for reverse flight but not good for Scale forward flight. The gyro actually has a piezo element that detects rotation and the electronics try to counteract the rotation. A google will give the specifics.

If your heli is sitting on the table, and you are in rate mode, the tail will stay centered until you jerk it. But after each jerk, the tail will re-center. In HH mode, the tail should stay in the center until you turn the heli. The gyro will adjust the tail (hitting the limits) trying to rotate the heli back to the original heading.

I know. Too much caffeine.

[Roehl]

my JR 3400G keep on buzzing without any tail movement. I was just staring at it for 5mins. and it just keeps on buzzing. Linkage keeps moving back and forth by 1mm. I know something is not right.

How do you re-bind a stock gyro?

[sokal]

my JR 3400G keep on buzzing without any tail movement. I was just staring at it for 5mins. and it just keeps on buzzing. Linkage keeps moving back and forth by 1mm. I know something is not right.

How do you re-bind a stock gyro?
front of maual
real simple
pg 18
is it buzzing or crackling

buzz means binding check the rod guides
if it cracling then its the digitalness of the servo contantly updating servo position

[Roehl]

its not binding because the pushrod is at 90deg. so it must be crackling.

So I guess the crackling sound is normal.

[DOCKERS2190]

LockMD

Hope you can explain but why do you ( we ) need to re-bind the TX having made this particular adjustment. Do the sub trims reset to zero giving a fresh (norminal) starting point.

[LockMD]

LockMD

Hope



Huh :confused:

[sokal]

rebinding
gives the TX the center locations and the low throttle settings

in other words the 3 wise men told us so it became law
plus its not hard nor does it take much time so
if all else its a peace of mind

[DOCKERS2190]

Sokal,

Lol, Thanks, Still dont understand but accept it's now law so will comply.

[LockMD]

LockMD

Hope you can explain but why do you ( we ) need to re-bind the TX having made this particular adjustment. Do the sub trims reset to zero giving a fresh (norminal) starting point.

Only had hope up there on my first reply - I thought you were praying for me :YeaBaby:

Sokal is the man.......be kind re-bind LOL

manual quote "After you’ve programmed your model, it’s important to rebind the system so the true low throttle and neutral control surface positions are programmed."

[carlo_the_wonder_frog]

The spektrum receiver takes a few seconds to initialise and lock in communication with the transmitter, during that time the gyro is initialising and may or may not pick up the receivers neutral point setting. If it does not see the neutral setting it just picks the one that was previously programmed. If that programmed neutral is different than what you currently have on your transmitter you will experience tail drift. The only cure is to rebind making the seen neutral the same as th transmitter neutral. Then when the heli finally initialises the receiver the neutral points will be the same and there will be no drift.

[DOCKERS2190]

Guys,
Thanks. Think I got it now. My understanding now is that also if RX loses TX then will resort to last known settings, ie last bind.

Therefore is best to re bind to keep RX memory uptodate with desired settings??!!

Thanks

[21knots]

Guys,
Thanks. Think I got it now. My understanding now is that also if RX loses TX then will resort to last known settings, ie last bind.

Therefore is best to re bind to keep RX memory uptodate with desired settings??!!

Thanks
Yeah that's interesting, how often should you have to re-bind?
And you do it in HH not rate mode correct?
I just put the 3400 with the stock gyro-
It's sooooo much more solid but yeah, I've got a very slow drift.

[LockMD]

Yeah that's interesting, how often should you have to re-bind?
And you do it in HH not rate mode correct?
I just put the 3400 with the stock gyro-
It's sooooo much more solid but yeah, I've got a very slow drift.



You should only have to re-bind if you change anything on the servos, even if you fine tune the tail (slider to center) any servo change re-bind and yes in HH mode (not sure if it makes a difference which mode I just do it in HH)

[21knots]

I'm wondering if the B400's have a common gyro setting in the Tx (70%? 90%?) for the 3400 and the stock 110..

[21knots]

You should only have to re-bind if you change anything on the servos, even if you fine tune the tail (slider to center) any servo change re-bind and yes in HH mode (not sure if it makes a difference which mode I just do it in HH)
Thanks Lock.

[LockMD]

I'm wondering if the B400's have a common gyro setting in the Tx (70%? 90%?) for the 3400 and the stock 110..



I have a 3400G mounted to the boom......my setting is 66%


I think my settings will have different reactions to others with the same equipment just due to the other setup issues (link sizes, swash plate levelness, pitch/thortle curves, etc...) just too many things at play.

[Felt]

Hey all...I am seriously thinking about upgrading my Gyro and rudder servo soon. I have noticed that some of you prefer the 3400 and some others. Can you use any servo brand with this Spectrum reciever? Sorry for the noob question.

Felt

[eugenefelisco]

Yes they use Jr3400 and I use futaba 9650 boom mounted also. You can use hitec it depends on your budget basically.

[LockMD]

Hey all...I am seriously thinking about upgrading my Gyro and rudder servo soon. I have noticed that some of you prefer the 3400 and some others. Can you use any servo brand with this Spectrum reciever? Sorry for the noob question.

Felt



Yup brand does not matter......I have had the 9650 and the 3400G both are very good tail servos......IMO the 3400G does feel a tad bit better BUT its 15 bucks more.

I am a cheap guy (ask the mrs LOL) but, to me, there are some things you just cant skimp on if your gonna spend any money the tail should take priority. Just my nickle.

[sokal]

I'm wondering if the B400's have a common gyro setting in the Tx (70%? 90%?) for the 3400 and the stock 110..
your gyro gain settings as high as you can till the tail does a back and forth ossilation then drop it down a bit that would be your setting
mine is 70

[21knots]

Right on Sokal- thanks!

[21knots]

Sokal, what does the tail do as you are raising it up to that high point?
-- If it oscillates at say 75%, as you're bringing it up to that, is it just going crazy?
Drifting like a mad man?
Or is it dead still, and when you gas it the tail throws etc.

There are so many variables it's blowing my mind.
Read, re-read threads.. fly a pack.. freak out.. take a breath and read again..

Thanks man, vids are EXTREMELY helpful..

[sokal]

if found so far that the stock gyro is not fast enough to keep up with the monster servos

but some have found that crack

make sure the servo is mounted firm
make sure your not binding the servo out
set the tail up in rate mode (less then 50%)
iv been told not to use subtrim but that may be with the 401 dont know
get the ball on the servo as close to the screw as you can help with the resolution so you dont over drive the tail and fry servo
center the slider on the shaft
now switch it back to HH start with 66%
then if tail control and copensation are correct hover if it drift trim it a bit
raise gyro gain work you way up to the point the servo shack back and forth then low till it stops.
iv also herd to set the POT on the gyro to the same TX setting herd the stock gyro sometimes reads it too (its cheap)


PS i was born and raised in Kailua, Hi

[21knots]

Ho shootz cuz!
Local kine! Howzit!?!?!
Mahalo brah!

-- Interesting about the gyro POT, I'll do that.
I'm going to run through the whole set up tomorrow start to finish over and over until I freak out.
I've been putting off the 401.. I'm gonna give the stock gyro another full day.
But that's it!!
Thanks again:thumbup: