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T-REX 500 › Desperate need help
04-10-2010 01:56 PM  8 years agoPost 1
jamese

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Carmel, IN

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Just put together a 500 and I'm having 2 problems. First I have a slight tail wag, but I think I can get rid of that. Second after hovering for about 30 seconds, the heli will start to do a slow piro to the left. I hit throttle hold and after landing the servo is stuck all of the way in that position. It seems to think all of the way to one side is center. If I unplug the battery and plug it back in it is fine and then if I fly it does it again. I have a CF kit with a belt drive. A 9257 servo and an inertia 860 gyro. I took the gyro and servo off of my 450 pro and they were fine. Could it be a bad pot, static, gyro issues?

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04-10-2010 11:58 PM  8 years agoPost 2
MikeInMobile

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Mobile, Alabama

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You have an offset issue with the gyro. Place the gyro in Rate mode, and adjust the Tail Servo until there is no rotation with a neutral trim. This will remove the gyro offset.

I have seen this issue many times!

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04-11-2010 12:12 AM  8 years agoPost 3
gian

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AZ

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That's right- some people like to skip this step.

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04-11-2010 01:08 AM  8 years agoPost 4
rocco.sj

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California,

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I would re-bind the whole heli again and redo the gyro setup with your T500. Also you might want to try what the other guys are saying too on this thread, which is setting the gyro on rate mode first.

JR Americas
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Radio Frequency RC

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04-11-2010 02:31 PM  8 years agoPost 5
jamese

rrNovice

Carmel, IN

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I thought it might be a static issue since the tail servo wire was right beside the belt pulley so I moved the servo wire far away from the pulley. I went up and flew it yesterday for two batteries mostly hovering with a little forward flight with no issue. Then today I flew again and did a few flips, forward flight, punch outs and things were fine, then I did a left piro and when I finished, the tail let go and went back into a left uncontrollable piro. I hit throttle hold and landed safely and when I went to the heli te servo was all of the way in 1 direction. I could move it by moving the rudder stick all of the way to the right but it would go back to the left like that was its center. I want to try the offset thing but don't quite understand.

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04-11-2010 02:53 PM  8 years agoPost 6
TrevJonez

rrKey Veteran

St.George, Utah - USA

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you just need to setup the tail in rate mode before you switch into heading hold. this basically makes sure that your tail is all centered up well. after that try a different gyro and if that still isn't right try a different servo.

sounds to me like a bad servo pot but i could be very wrong.

Who cares... its just money...

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04-11-2010 11:18 PM  8 years agoPost 7
rocco.sj

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California,

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I have no ideal on how inertia 860 gyro works, but from looking at the manual instructions,it seems almost like a Futaba 401 setup.

Inertia 860 gyro manual setup link:
http://file.espritmodel.com/documen...nstructions.pdf

Here is a link about a 401 gyro setup,hopefully you get your bird going, and have no more issues.
http://www.rchelisite.com/how_to_se..._gy401_gyro.php

JR Americas
Evo Power Battery
Radio Frequency RC

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04-12-2010 01:59 AM  8 years agoPost 8
MikeInMobile

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Mobile, Alabama

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The 860 is a bit more advanced than the 401, but the setup is almost identical, except for a few additional adjustments that are available.

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04-12-2010 02:55 AM  8 years agoPost 9
Melnic

rrElite Veteran

Columbia, MD,USA

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You can't expect a servo to be centered (in most cases) after landing in throttle hold. In headin hold the gyro moves the servo any amount needed to bring the heading to the correct position. If you land in throttle hold, and the tail does not hold as it's falling down, the gyro will move the tail servo to compensate, but it can't cause your RPM probably was not enough.

MOST people either adjust for a near drift free hover in rate mode and idle up (in a hover) or they just adjust for zero pitch in rate mode on the bench. I always do the adjust for near zero drift in idle up and rate mode myself.

With a standard tail setup on a 500, your tail servo will be 90 degrees in rate mode with all trims and subtrims in the radio centered. Your tail slider will be slightly LEFT of center(while looking from the back of the heli).
http://www.mycoolheli.com/reviews/ReviewGY48v.html
This is for a cheap 401 Clone but you can see what me and others are talking about. There are gyro setup threads for other gyros that pretty much say the same things.

Are you sure the belt is holding? It could be slipping.
Is this an Align 500 with a belt or a clone 500?
It could be a gear slipping on a shaft up front too. A front tail gear or tail shaft gear slipping on the shaft would yield the same results you are describing.

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