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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › 611, tail lock out?
09-07-2006 11:12 PM  14 years ago
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Dblex

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Texas

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611, tail lock out?
Was in Reg FF when the tail started spinning by herself. Hit hold and brought her in.

this is a brand new 611, and all is ok electronically that I "can see"

tail rod is ok, all links ok,

radio hit? or....?

any others experience this with the 611? or am I looking too deep into this?
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09-07-2006 11:22 PM  14 years ago
vince

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Victoria BC Canada

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what volt system are you running?
4.8 4 cell or step down stuff from lipos?
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09-07-2006 11:42 PM  14 years ago
Harts

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Victoria, Australia

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I had this happen on a 601. Flew fine for a bit then full piro into dirt. With hold the piro didnt stop so it still had tail drive and it was the servo at fault. The gyro/servo had 14 flights on it before this happened.
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09-08-2006 02:50 AM  14 years ago
Dblex

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Texas

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4.8 4cell JR 2400
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09-08-2006 02:59 AM  14 years ago
HELILAB

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Sunny Miami Lakes, Florida 33016

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It hapen to me about two weeks ago, I autoed down ck everything and looked ok. so I flew it again hight and it worked fine but now is in the back of my mind every time I fly it, this 611 combo is about 30 flights old and already send it to Hobby Services one time and now is ding this. The first time that broked was the cable from the sensor and now it could be the servo that is going bad. Never had any issues with te 401sMario
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09-08-2006 04:32 AM  14 years ago
patriot21

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Byron,MN

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yep... my 9256 took a crap on me in flight....tried to auto it down but luck was not on my side...
i sent the servo back and they just sent me a new one...so maybe its a trend
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09-08-2006 09:42 AM  14 years ago
FBaity

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Tuscaloosa, AL

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O S I hope its not a trend, just put one of these in a new Bergen Turbine.

Frank Baity
AMA 38026
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09-08-2006 09:51 AM  14 years ago
Harts

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Victoria, Australia

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I wouldnt say its a trend as far far more work then dont. I would say its just a case of anything mass produced is going to have a small amout of failures. Though I had a 601 do the same thing i have also had a lot more that didnt.
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09-08-2006 09:58 AM  14 years ago
gt900uk

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I had a 9251 do this to me and someone i know went through alot of them as well. I think where i fly its deff some kind of trend. The thing is they have all showed signs before going completly. So if your tail suddenly does not feel as locked in and does not hold as well as it did i would be warry of the futaba servo holding it there.This Heli Will Self Destruct In Five Seconds!!
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09-08-2006 11:02 AM  14 years ago
w.pasman

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Netherlands

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Was in Reg FF when the tail started spinning by herself. Hit hold and brought her in.
If the gyro failed and assuming you have a driven tail, hitting hold would not have worked.
So my guess is that there was something else failing on you.
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09-08-2006 11:44 AM  14 years ago
Dblex

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Texas

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Hitting hold slowed the piro rate enough to get orientation to bring her down. High grass saved the heli. If your telling me hitting hold did nothing, I think a we would all dissagree with you. Hitting hold in a bad situation has saved my heli over a dozen times. Sorry it didnt work for you.
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09-10-2006 12:01 AM  14 years ago
Dblex

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Texas

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LMAO!!!! your not gonna believe what the problem was after changing leads, extensions ect...

went to test fly today and all was working the way it should..just had no torque on tail


LMFAO!!!!!

freakin pin in the pulley was missing!!!@#$@!%!%^

that explains having some "control"
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10-09-2006 08:05 AM  14 years ago
Jungle Jive

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az

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mine didnt do the same thing but similar. i could do tail down death spirals perfectly fine, but i couldnt do tail first loops without it letting go and wigging out.

steve
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10-09-2006 08:16 AM  14 years ago
Colin Mill

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England

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Hi Gents

Can I just ask how many of you that had a problem were flying a belt driven tail model at the time?

Best regards

Colin (CSM)
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10-09-2006 10:40 AM  14 years ago
dialarotor

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Traverse City, Michigan

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Hi Colin, are you heading towards the belt drive causing static electricity that is causing these problems? What's the solution, spray the belt with that laundry stuff that reduces "static cling"?
We are going to have to start monitoring, belt versus shaft drive, dry conditions vs. humid conditions, aluminum boom versus carbon boom.
Dialarotor
RapRexSynLogo Pilot
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10-09-2006 11:26 AM  14 years ago
Bad Karma

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UK

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Harts said,
I had this happen on a 601. Flew fine for a bit then full piro into dirt. With hold the piro didnt stop so it still had tail drive and it was the servo at fault. The gyro/servo had 14 flights on it before this happened.
If that had happened at a club near me they would have chucked you out, or in my case not let you join (couldnt have happened at a worse time) afterall a pilot has so much say in when a servo fails but its ok if they have mechanical problems with planks.
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10-09-2006 11:44 AM  14 years ago
Colin Mill

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England

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Hi dialarotor

Yes, you got it I now use a graphite loaded spray called Graphit 33. it is messy to spray - better to spray it into the cap and paint it onto the back (smooth) side of the belt. This puts a conducting layer on the belt that stops the charging at source. A lot easier than bonding everything (including main and tail shafts) together as we used to in the past.

Best regards

Colin
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10-09-2006 12:32 PM  14 years ago
dialarotor

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Traverse City, Michigan

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Does this happen with boom mounted servos more than with those old style machines with the servo and gyro mounted up front away from the belt and boom? Would using a torrid coil like the TREX folks do with the BEC wire help eliminate the interference? Where would you use one, on the tail servo lead?RapRexSynLogo Pilot
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10-09-2006 12:46 PM  14 years ago
Colin Mill

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England

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Hi dialarotor

Interestingly, the forward mounted servo does not seem any less prone to problems - I guess because the pushrod is metal and electrically spans the gap very effectively. I don't think that filters will do much against a major static discharge as its going to put tens of kilovolts into the system at some random point. It could for example track down the tail pushrod across the tail servo arm down the arm retaining screw and asross the nice little spark gap to the shaft of the servo's feedback pot so the poor servo can get it in the neck without much to stop it.

Colin
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10-09-2006 02:51 PM  14 years ago
dialarotor

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Traverse City, Michigan

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Colin,
Are you familiar with static discharge wicks? If you look at general aviation planes and airliners they mount little thin wire wicks on the trailing edge of wings and elevator assembly to bleed of accumulated static to prevent avionics interference. would something on a smaller scale on the landing gear/mainframe intersection of off the back edge of the tailfins work to lessen the build-up of tailbelt static charges?

Dialarotor
RapRexSynLogo Pilot
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › 611, tail lock out?
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