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HelicopterMain Discussion › 450 pro with GY520 Gyro, HELP!!
08-05-2011 12:57 AM  6 years agoPost 1
salrica

rrApprentice

Raleigh,NC

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I have a 450 pro with a GY520 gyro and S9257 tail servo.
I though that with the new tail servo I will be able to set the limits on the gyro/servo, but still the same.
I have an old post here with the same problem and several people tried to help me that time, I was able to fly the heli and the gyro was rock solid but I didn't realize that the pitch slider was off center, So here we are again.
I'm using a T7C tx
My gyro gain is up A 37, DN N 40 on the Tx.
The first problem is trying to set up the gyro on rate mode.
If you look at the video, at the beginning I center the servo horn first on rate mode and when I go to set the limits (the red light flashes 3 times) the servo arm moves towards the heli frame, loosing the 90 with the servo.
I can fly the heli with this set up, even if I loose the 90 on the servo, move the heli one side or the other, but I'm missing like 3mm on the tail pitch slider (outside of the heli boom side).

The second problem is when I try to set up the gyro on HH mode.
If I have the servo at 90, the arm would move to both sides on full on the tail pitch slider when I try to set the limits.
I can not Increase the limit or decrease it on the first parameter, on the second parameter I can just decrease it.
On HH mode the heli starts drifting.
I need your guys help; I bought this gyro used from a HF member.
But I want to know if is me or the gyro before I get in contact with the previous owner.
Is not the gyro direction the problem, is the heli drifting after setting it on HH mode.
Thank you all in advance!

Watch at YouTube

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08-05-2011 02:11 AM  6 years agoPost 2
scott s.

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Orange, Ca.

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move out

on your servo arm to get the throw rather than play with the limits.

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08-05-2011 02:14 AM  6 years agoPost 3
Heli-on

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Southern Cali, CA - USA

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I'm sure the gyro is fine. Simple test: stand behind the heli, move rudder stick left and right and observe opposite movement from slider. This tells you the channel polarity is correct. Now stand from the tail rotor side of the heli. Move tail towards you, slider should move away. Move tail away from you, slider moves towards yourself.

Don't worry about getting things exactly 90-dgrees. It's a starting point. In rate mode, spool the thing up and try to get it to hover, observe which input your giving it. Now land it, do the same stick input to figure if you need to shorten or lenghten the control rod. May take a couple of times, but get it close. Doesn't even need to be perfect, just close.

Make sure you don't have any sub trim, regular trim, or ATV endpoinst set on rudder. You should also be sure to have proper endpoint values assigned to your gear channel and see the LED change to red when it goes into HH mode.

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08-05-2011 02:39 AM  6 years agoPost 4
salrica

rrApprentice

Raleigh,NC

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GY520 gyro

Heli-on

Thank you for your advice

But is not the gyro direction, this is set right as you saying.
If i move the tail servo holder or the linkage as you suggesting the tail pitch slider ends up almost on the tail boom side, loosing the limit on the other side.

Scott-s

move out

on your servo arm to get the throw rather than play with the limits.

I will give it a shoot.
You telling me to pull off the servo arm and not have it a 90, but instead have more throw on the side that I'm missing... RIGHT?

I will make a better video tomorrow.
some how my handycam is not working and I'm using my son's iphone, giving me just 10 mins of video

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08-05-2011 10:03 PM  6 years agoPost 5
wc_wickedclown (RIP)

rrProfessor

long beach calif

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i think he is saying move out further then 7mm from the center of the screw on the rudder servo

and YouTube allows 15min for video

you have to use the advance option on the right of the upload page

also when you have the tail push rod of the servo horn push it back and forth to insure the tail is not binding and the tail does actually go all the way to the left and right without binding.

Insha Allah made in america

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08-05-2011 10:17 PM  6 years agoPost 6
CX1

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Canada

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I wish people would start using a RX pack instead of a lipo or at least disconnect the motor please
you almost had accident in video.

for your gyro I would re-read the manual even though you are close you are mis-understanding what they write,

to center your servo plug it in the rx directly this will allow to get center if you are unsure how to do in gyro menu
Unless the manual says to set-up in rate mode don't but rather center the slider then adjust your limits

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08-05-2011 10:22 PM  6 years agoPost 7
wc_wickedclown (RIP)

rrProfessor

long beach calif

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CX1 I wish people would start using a RX pack instead of a lipo or at least disconnect the motor please
you almost had accident in video.

for your gyro I would re-read the manual even though you are close you are mis-understanding what they write,

to center your servo plug it in the rx directly this will allow to get center if you are unsure how to do in gyro menu
Unless the manual says to set-up in rate mode don't but rather center the slider then adjust your limits
thats a good idea .

he could disconnect the gyro and plug the servo directly to the rx to get his 90.

and that would be the first gyro ive ever heard of to be setup in heading hold dont they all recommend to setup in rate mode ?

im trying to call futaba for you as well i think your at work and have no time.

Gyros FAQ
Do I trim my GY520 in the gyro's heading hold setting?

When using the GY520, it is imperative for the modeler to trim the helicopter in the Normal mode and not using the gyro's heading hold settings. All Futaba gyros have some amount of AVCS gain pre-programmed from the factory. If the model is trimmed while compensating for this, the model would exhibit poor tendencies in certain flight conditions.

Insha Allah made in america

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08-05-2011 10:47 PM  6 years agoPost 8
CX1

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Canada

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not all gyros are the same some need to set-up in rate mode and some don't. the owners manual will tell you the best way to set it up.

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08-05-2011 10:53 PM  6 years agoPost 9
wc_wickedclown (RIP)

rrProfessor

long beach calif

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CX1 not all gyros are the same some need to set-up in rate mode and some don't. the owners manual will tell you the best way to set it up.
could you name one so ill know if i ever run across one ?
please and thank you

Insha Allah made in america

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08-05-2011 10:56 PM  6 years agoPost 10
salrica

rrApprentice

Raleigh,NC

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450 pro with GY520 Gyro

CX1

I tried before, on other heli, to center the tail servo connecting it directly to the rx.
But I been told not to do it on this way.
Now I'm confuse.
But I will follow your advice and go from there.
The manual doesn't mention to set it up on rate mode, but I been doing my research and some people is saying that futaba recommends to do it on rate mode.

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08-05-2011 10:57 PM  6 years agoPost 11
CX1

rrKey Veteran

Canada

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mini -v bar and cy solid g and mini g are the ones I know of that don't require rate mode set-up
The manual doesn't mention to set it up on rate mode, but I been doing my research and some people is saying that futaba recommends to do it on rate mode.
If futaba says to do it that way then do so.

however centering the slider is a place to start

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08-05-2011 11:35 PM  6 years agoPost 12
salrica

rrApprentice

Raleigh,NC

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450 pro with GY520 Gyro

CX1

I set it up on HH and rate mode and center the tail servo connected straight to the rx as you suggested and still drifting.

I called futaba and JOHN told me to send an e-mail to support center and I haven't heard from them.
He said that i will receive an e-mail from them in 24hrs and is been 36 and haven't heard a thing.

I have Futaba radio, Rx, gyro and servo.
And this is how the service department works??!

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08-05-2011 11:42 PM  6 years agoPost 13
budz

rrApprentice

las vegas

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try this

bind the RX while you are in HH. then turn off everything and remove bind plug.

turn on TX and Rx then go to your gyro rate mode on tx. center servo arm (BTW, the nearer the ball link to center, the less chance for tail wag and the more you can increase gyro gain for better tail hold).

while in rate mode and servo arm is center, adjust link so that you will have a slight tail blade pitch. normally about 2-3 degrees of blade pitch to the right (when tail blades are vertical, the trailing edge should be to your right when viewed from the top). this is the same as mechanically setting/flying it up in rate mode.

turn off tx and rx. then turn on tx and this time, MAKE SURE YOU ARRE IN HH MODE. then turn on rx.

if there is drifting and you see the light flashing after you fly, this means the gyro lost its center or is looking for it. for the 520, the SOLUTION is to rotate the gyro then mount it again. hope this helps.

one more thing, make sure that everytime you turn the rx on, you are in HH.

team solo

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08-06-2011 12:08 AM  6 years agoPost 14
wc_wickedclown (RIP)

rrProfessor

long beach calif

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CX1 mini -v bar and cy solid g and mini g are the ones I know of that don't require rate mode set-up
The manual doesn't mention to set it up on rate mode, but I been doing my research and some people is saying that futaba recommends to do it on rate mode.
If futaba says to do it that way then do so.

however centering the slider is a place to start
good information thank you kind sir.

Insha Allah made in america

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08-06-2011 12:24 AM  6 years agoPost 15
Heli 770

rrProfessor

USA.

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08-06-2011 01:16 AM  6 years agoPost 16
Swoop

rrElite Veteran

Newark, DE USA

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..

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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08-06-2011 01:39 AM  6 years agoPost 17
salrica

rrApprentice

Raleigh,NC

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450 pro with GY520 Gyro

GOT IT!!!

I'm following advice on HF and on this forum.

Thank you all!!

Now it's ready for Tomorrow, I hope I don't crash it!!

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08-07-2011 01:50 AM  6 years agoPost 18
salrica

rrApprentice

Raleigh,NC

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450 pro with GY520 Gyro, HELP!!

I went to the filed today and everything is working the way they should.

Thank you all !!!

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HelicopterMain Discussion › 450 pro with GY520 Gyro, HELP!!
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