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HomeAircraftHelicopterAlignT-REX 700N › Trex 700 Tail problem
04-27-2009 04:13 AM  9 years agoPost 1
TattooArtist

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Chestnut Ridge NY

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my tail on my bird just started to kick back and forth like if the gain on the gyro is too high for no reason at all.gyro is a 611 heli has been flying great for the last 3 months no crashes or hard landings.
Tx is a futaba 10c 2.4

I have done the following.
changed gyro and servo
disconected my gv1
looked at the entire tail system push rods,gears,torque tube and all seams fine.
I just removed my main shaft bearings and one is greaty so im going to replace it.
Any suggestions would be very appreciated its getting to Me already

thanks
Alex

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04-27-2009 05:42 AM  9 years agoPost 2
Sam2b

rrElite Veteran

Tacoma, WA

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How many volts are you running your electronics on? 6v? 8v? What ever the voltage make sure your gyro & tail servo truly is receiving no more than 5v. If not your tail servo will have an early death and start failing. Use a volt meter on the positive and negative leads before you connect your gyro and tail servo to preview the voltage.

If the heli has been good for a 3 months, I now suspect the tail servo.

_Sam B_

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04-27-2009 06:30 AM  9 years agoPost 3
DKTek

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Melbourne, FL-USA

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Has the engine tune changed for any reason?

The beatings will continue until morale improves...

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04-27-2009 06:41 AM  9 years agoPost 4
TattooArtist

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Chestnut Ridge NY

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Volts
i am runing duralites with a 6v reg and a 5v step down on my rudder servo.I used these same electronics on my 600 before with no issues it cant be the servo cause i used a friends futaba520 gyro with his servo and still the same tail hunting.i have not changed any needles settings on the engine yet.

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04-27-2009 06:55 AM  9 years agoPost 5
sasa

rrNovice

UAE

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if your tail servo ok so this is happen due to a lot Vibration may it comes from engine main blade out off track flybar or tail torque shaft .

SASA

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04-27-2009 07:11 AM  9 years agoPost 6
Melon

rrApprentice

California

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Pull out your torque tube and check to see if your bearings are still in place and are running smooth. That might be the problem.
Is your tail system smooth?

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04-27-2009 02:23 PM  9 years agoPost 7
TattooArtist

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Chestnut Ridge NY

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tail
I removed the tail shaft the bearings are smooth but they were to close to the center of the shaft. I re glued the bb and I will test fly it tomorrow.

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04-27-2009 05:31 PM  9 years agoPost 8
Sam2b

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Tacoma, WA

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TatooArtist,
You say it wags back and forth quickly, and not a slow/small oscillation?

_Sam B_

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04-27-2009 10:32 PM  9 years agoPost 9
TattooArtist

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Chestnut Ridge NY

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movement
it moves from left to right about a foot apart.weird like if im actually moving the rudder side to side to do it.

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04-27-2009 10:36 PM  9 years agoPost 10
Sam2b

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Tacoma, WA

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Alright. Based on the description I believe the servo would be the most effective piece of hardware to target for replacement. Please do post what you find. I'm interested.

This tail movement happens when you are merely hovering?

_Sam B_

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04-28-2009 03:57 AM  9 years agoPost 11
TattooArtist

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Chestnut Ridge NY

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hovering
Yes it happends when I'm in a hover but I'm afraid to fly it around since I'm afraid the tail will let go

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04-28-2009 08:32 AM  9 years agoPost 12
sasa

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UAE

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before start engine check tail servo then start engine at idle and look at tail servo and move model to see the response of gyro and servo if it is ok push throttle but before take off and also check at different head speed and let us now when problem appear .to specify problem then correct action .

thanks

SASA

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04-29-2009 03:31 AM  9 years agoPost 13
TattooArtist

rrVeteran

Chestnut Ridge NY

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fixed
WuHOOOOOOOOOo I found the problem guys it was the tail blade grip screws that screw into the tail hub it had backed out about 2 turns so it was causing shifting in flight.now I can finally catch up on my sleep

Thanks guys for all your help

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