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HelicopterMain Discussion › Gyro problem
07-13-2008 11:15 AM  9 years agoPost 1
Jonty

rrVeteran

Wellywood

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Hi all, I hope someone can assist me but I have a strange problem. I have just turned on my raptor 50 with a 401/9254 and a dsx9 and the servo (without the heli running) is twiching like crazy. The servo will move a full half tun and back without me touching anything or moving the heli. The gyro light will go solid for a bit then just start flashing then goign back to solid. Something has gone very crazy. Anyone else had this? If I move the rudder stick there is also a delay before the servo move and sometiems not at all. I would have throught the servo for a start but then the gyro is not locking in.

J

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07-13-2008 11:20 AM  9 years agoPost 2
Ray Fernandez

rrElite Veteran

Guam (U.S.A.)

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Check to see if any of the wiring are frayed or cut. M<ight be grounding of wiring somewhere. Also check to see if your radio (if you are not using 2.4 gHz) is set on the parameter (PPM vs. PCM)

Ray Fernandez - GUAM

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07-13-2008 11:24 AM  9 years agoPost 3
Jonty

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Wellywood

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Thanks. I am using 2.4. This is bizzare, now it is holding. It makes me very nervous to take it up if it is this random. I will check all the wiring but I can see any problems so far. Odd.

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07-13-2008 11:46 AM  9 years agoPost 4
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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I had this after a crash.I had to turn om and off until it worked .I finally sent for repair .

I stole it ,flew it and gave it back ;)

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07-13-2008 12:29 PM  9 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

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Sounds like a loose wire or something to me. If it keeps up I'd send it in. Make sure all the connectors are clean and tight and start gently pulling on and shaking all of the gyro and rudder servo wires and see if you can make it to it. If it starts jumping around while you're fooling with the wires you have a bad soldier joint somewhere.

Andy
AMA 77227
http://www.jaxrc.com

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07-13-2008 12:42 PM  9 years agoPost 6
Invrted1

rrVeteran

Cincinnati, Ohio

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Sounds like it is not safe to fly. Unplug the RX connections and plug them back in and recheck. If this is not an after crash observation then there may be a problem with the gyro. The servo moving is one thing, but the gyro not locking is what is causing the servo to move, so that is probably where the trouble is. If the connections are all good then you might need to send the gyro in for service.

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07-13-2008 12:59 PM  9 years agoPost 7
scottc

rrKey Veteran

shakopee minnesota..USA

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Also check to make sure there is no trim or subtrim in the radio, thats what it sounds like to me.another thing to check is if the same thing happens when the gyro is not in heading hold mode.

Hey I didn't ask for this fetish.!!!But I'am sure paying for it....

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07-13-2008 02:01 PM  9 years agoPost 8
Climax

rrVeteran

West London, United Kingdom

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Where have you mounted the 401?

On my Raptor I once placed mine up front effectively on top of a reasonably powerful collective servo. The magnetic field generated by the servo interfered with the sensor in the 401.

I took me a while to work out what was going on, but once I moved the 401 away from the servo all was well. I stuck it at the back above the tail where I should have put it in the first place...

This may not be you issue, but I though I'd mention it just in case.

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07-13-2008 02:08 PM  9 years agoPost 9
Jonty

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Wellywood

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Thanks, no it is at the back. It is almost like some kind of radio interferance but I have 2.4! It could well be a loose wire somewhere. It is such a pain not having a clue what is worng becuase as it is in a scale I have to strip the bloody thing down

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07-14-2008 03:39 PM  9 years agoPost 10
Skarn

rrVeteran

Pasadena, MD

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Also check to make sure there is no trim or subtrim in the radio
There is nothing wrong with using subtrim on the rudder to get the servo are at 90deg....most flyers I know including myself set it up this way and it flies great!

Skarn

It's better to burn out than to fade away...

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07-14-2008 04:18 PM  9 years agoPost 11
BarracudaHockey

rrMaster

Jacksonville FL

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Well its better to do it mechanically than with sub trim but yes, it wont cause the problem he is having.

Using a few points of subtrim to center up the servo isn't going to hurt anything.

Andy
AMA 77227
http://www.jaxrc.com

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07-14-2008 04:31 PM  9 years agoPost 12
MichaelC

rrApprentice

Vermont

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Was the Rx battery fully charged? Did you happen to check the voltage? A low Rx battery can cause a 401 to behave eractically.

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