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HomeAircraftHelicopterMain Discussion › rudder ATV problem
06-04-2014 09:47 PM  4 years agoPost 1
BENTDABOOM

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west seattle

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am setting up another 500 and when in rate mode the slider works good stays within limits and doesn't bottom out, "hence the arms are both 90 degree" but when I switch to HH and try to reduce the throw in ATV so it wont bottom out it wont do anything except slow the piro rate down,,,,radio is a 9303

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06-04-2014 10:13 PM  4 years agoPost 2
Simmer

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Massachusetts

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in practice in the air, you cant bottom out. Your heli will spin before it can bottom out, but that is not your answer here.
I have a 9303

Which gyro or is it flybarless system are you trying to setup?

Your model (the 500) what are the suggested distances from the center of the servo (wheel) to the hole they recommend?

as an example (which wont fit your heli) I think the Trex600 is 22 mm. Going longer will give you greater travel, shorter less. You have to set it up as the manual tells you for starters.

also the 9303 is it travel adjust or end points your setting? Trying to do this from memory here.

Oh and the end point adjustment on the 9303 does effect the piro rate. Higher is faster. This is how its supposed to work

I set mine to about 115 both sides to speed up my piro (on my older gyro which I don't use since I went flybarless.

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06-04-2014 10:30 PM  4 years agoPost 3
BENTDABOOM

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west seattle

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forgot all about servo arm length I think I need around 10mm
will try that 1st

BTW gyro is a 240 and its a FB model

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06-04-2014 10:30 PM  4 years agoPost 4
JKos

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Redondo Beach, CA

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BENTDABOOM,
When a tail gyro is in heading hold/heading lock mode, the rudder channel ATVs/EPAs/Dual Rates have zero affect on the physical throw of the tail servo. You rudder input is a degrees per second input, not a servo throw input. So, your observation that "it wont do anything except slow the piro rate down" is exactly correct and as expected.

The physical throw of the servo is adjusted on the gyro itself.

- John

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06-04-2014 10:31 PM  4 years agoPost 5
Simmer

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Massachusetts

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Yup what Jkos said

https://rc.runryder.com/t161800p1/

yea 22mm was prob not right bad guess on my part even for a 600

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06-04-2014 10:33 PM  4 years agoPost 6
BENTDABOOM

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west seattle

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[quote]The physical throw of the servo is adjusted on the gyro itself.
- John

its a 240 so thiers no limit setting

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06-04-2014 10:38 PM  4 years agoPost 7
Simmer

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Massachusetts

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Ahaa that's it, no setting on the Gy240.

setup directions for the 401 here
http://www.raptortechnique.com/gy401-jr9303.htm

but no way to control the total movement on that gyro.

It looks scary that it may bind but trust me, it will not in the air as the heli will move immediately on the tail command and it will never hit the end.

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06-04-2014 10:47 PM  4 years agoPost 8
JEEPWORLD2002/2

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Blue Bell, Pa

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Only way to adjust the travel on the 240 is move the ball in on the servo wheel/horn

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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06-04-2014 11:55 PM  4 years agoPost 9
BENTDABOOM

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west seattle

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ok just put the servo arm ball to 11MM but need to try 10 which will hopfully be better, thanx

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06-05-2014 12:03 AM  4 years agoPost 10
JKos

rrProfessor

Redondo Beach, CA

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You also have to evaluate gyro performance versus ball position. If you go in too far and you lose performance, you'll need to go back out and live knowing it's unlikely to ever bind in flight.

- John

RR rules!

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06-05-2014 03:15 AM  4 years agoPost 11
Simmer

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Massachusetts

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I'm telling you... it will not bind in flight. If you try to prevent it from binding on the ground in HH mode as the other poster mentioned, you will sacrifice the ability of the gyro to perform.

Here is the gy240 setup proceedure for a futaba radio. It is very similar for a 9303.

http://www.raptortechnique.com/gy240-futaba9c.htm

this step in particular "Set the mechanical limit"

You should have the linkage set to center the tail at this step. Now to set the limits set 'AVCS' switch on the gyro to ON then move the rudder stick full right and see if the ball on the servo arm moves further then the link can go or if it is not enough. If the ball will travel further then the link can go then you need to move the ball in one hole toward the center. If it does not go far enough (this is only when giving a right rudder command) then you need to move the ball out one hole.

this step is key. Notice it says move to the right. This is based off a clockwise main balde travel. Typical for most helis. (a few european brands are couter clockwise if viewed from the top)

Anyway...
You still should not worry about it over driving past the limit. Think of the heli in the air. You move the stick to full, what happens? the tail spins and as it does the servo gets satisfied and stops travel before the limit. As long as your "in the air" it will never bind. I thought the same as you when I set up a few gyros in the past, but no longer. I saw the improvement, I read up on this forum, you should trust me on this. If I thought for one minute it would damage the servo, or cause a crash, I wouldnt tell you this info. But Ive done this myself.

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