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Home✈️Aircraft🚁HelicopterBeginners Corner › Gyro hold problem
02-28-2012 01:56 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Gyro hold problem
I have now 15 7 minute flights (hover) on my Trex 500 and the gyro just will not hold. In a 7 minute flight it will turn right a good 270 degrees without any rudder. Is that Ok or should I always give left stick to correct?

Today I placed 2nd foam tape under GP780 gyro thinking that would correct the problem. It did not. It still has a slight wag back forth too. I changed the gyro gain to 62%.

Is there anything else I could try to correct this problem. I have not tried to trim rudder yet cause I was told not to on here. Any help would greatly be appreciated.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-28-2012 04:41 PM  9 years ago
doorman

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Sherwood, Arkansas

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Trim The Rudder...
That is the best place to start...if it is out, it just makes the gyro work harder.. in rate mode you should be able to sit in a hover with no turn in either direction, and if it does to a MECHANICAL set up.. do not use you sub trims on the gyro..
Once the mechanical is done (usually with the servo centered the tail slider will be just about in the middle of the available shaft that the tail hub is attached to...
There are those that believe that these adjustments are not needed..that is what HH is for... My question is WHY not make it's job a little easier...

Hope this helps you out... Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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02-28-2012 05:51 PM  9 years ago
ThumbBumper

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A little to the right and down!

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^ +1
Make sure you are as close as possible to no movement in rate first...

Also, make 100% sure that you allow the gyro to fully initialized before moving the heli. I usually put it in rate mode to move it and then put it in hold when ready to fly.
If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/
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02-28-2012 05:55 PM  9 years ago
ThumbBumper

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A little to the right and down!

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Oh, one more thing....

Make certain that you don't have any high speed vibration in the tail. I had an ever so slightly bent hub between the tail blade grips that caused my gyro to do the same thing. Dang thing drove me nuts for quite a while until I ultimately replaced every part in the tail.
If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/
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02-29-2012 01:28 AM  9 years ago
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rrApprentice

Toney, AL. USA

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Thanks Thumb Bumper it looks like found the problem. AerialSkyCam told me to check the rudder servo to ze if it was 90 degrees on power up and it was but my tail fins were not zero/flat. So had to adjust my tail linkage rod to get fins straight and problem is fixed. Thanks for the input, don't know what I would do without you guys out there showing me the way.

Just hope I don't let y'all down and be able to share info when I get a chance to someone getting into this sport.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 03:26 AM  9 years ago
Stephen Born

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USA

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Gary, did that fix the problem? How does it fly? Inquiring minds want to know.
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02-29-2012 12:01 PM  9 years ago
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rrApprentice

Toney, AL. USA

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I now have a Heli that stays straight on while in the air. The wind was kick some on my last flight so not really sure but it flew awesome.

The tail does still wag slowly but again I have not seen another belt 500 yet to compare with so I can live with the wag. I do know when I give it hard throttle to go straight up the tail kicks hard right. Not sure if that's normal but that's another chater in my adventure. Thanks to all.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 12:07 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Doorman I forgot to thank you for that bit of info on tail servo trim. That was the problem, I was able to call AerialSkyCam and he talked me through the fix process.

Just have a slight tail wag but I can live with that. Thanks.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 02:21 PM  9 years ago
doorman

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Sherwood, Arkansas

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Glad To Help!!
Gary, glad we were able to lead you in the right direct
ion...
About the slight tail wag, first check the linkage from the servo to the tail.. You do this buy holding the servo arm (power off) and then check for movement by trying to move the tail grips gently...this will show if there is any "slop" in yhe linkage connection..if both ends use ball links you should be good...
The second thing to check as mentioned by TB, turn the tail with the slider in different spots on the shaft. Any movement here will mean a beny tail rotor shaft..
So, you aren't quite done hunting, but glad to hear the worst part is cured...

Good Luck....Stanl
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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02-29-2012 02:56 PM  9 years ago
SGM Retired

rrApprentice

Toney, AL. USA

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I checked the tail and there is no play in the servo to tail linkage. But the tail fin grips do move left/right with some play. They are they stock plastic gripes so that might be ok. I thought they were lose so tried to tighten but they are tight.

I could upgrade to metal gripes for both main and tail maybe. Do many upgrade to metal gripes?
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 05:24 PM  9 years ago
doorman

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Sherwood, Arkansas

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Tail Servo??
So, when you move the tail grips in a "circular" motion, you do not see the slightest movement of the tail slider???(while holding the tail servo so that it cannot move.. if you see the slightest movement you need to find out where it is coming from.. a bit frustrating at times but it needs to be gone... I really don't think that metal grips are needed...
What tail servo are you using... digital, anolog, and the voltage and speed??? And is the gyro set to match your type of servo?? What are your travels and gain values set at on the tail??

Did you try just turning the head and watching the tail slider on the shaft to see if it moves back and forth a bit while turning the head??

Lot of questions!!!!

Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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02-29-2012 08:25 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Stan, I checked the movement bit and it looks tight. As for the tail servo I'm running a Futaba S9257. As for the other questions you asked, I don't have a clue. If you can walk me through the process to check I can tell you. I know the Gyro gain is set at 60%.Trex 500FB Trex 600ePro McpX. Synergy E7SE
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03-01-2012 12:27 PM  9 years ago
neilg.

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north of borston

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delay?

The 9257 is not offically rated for use at 6V
In Nomeni Patri Et Fili Spiritus Sancti
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03-01-2012 12:50 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Neilg, so just what does that mean? I'm not sure what voltage my ESC puts out. Do you of a servo that does operate at 6v? Thanks.Trex 500FB Trex 600ePro McpX. Synergy E7SE
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03-01-2012 01:13 PM  9 years ago
Stephen Born

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USA

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Gary, PM me your mailing address. I am going to send you a step-down.
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03-01-2012 01:51 PM  9 years ago
SGM Retired

rrApprentice

Toney, AL. USA

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PM sent with address.

First flight with new pitch/thro curves in the Dx6i. Wow, that was a little different and is a learning curve there.

Note to self, with new curve values if bird goes to high don't lower throttle stick to quick or bird will fall fast. Thank goodness I was 30 feet up. Now all is good except there is still a slight wave going on with tail. Hope to fly at Heli field with other heli's this weekend so they can see if it's normal or not.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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