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T-REX 500 › Serious tail problem
05-31-2012 06:08 PM  6 years agoPost 1
TheROCKMAN

rrApprentice

Americus GA

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Here is what I have to work with:

Align T-Rex 500esp
JR X9503 radio
JR AR7100 receiver
JR G7703d gyro
Futaba 9257 tail servo
4.8v receiver pack

The problem is I have no control of the tail. When I spool up the heli the tail begins to twitch hard back and forth...I of course lowered the gain but to no avail. It still does the same thing whether I have 10% or 80% gain. Almost like the gain is having no effect. I have tried using the gear switch for gain and also using the gyro menu and Aux2 for gain. Same results for both ways. I know that HH is working because I can flip the HH switch (gear or Aux 2 depending on which one I am using) and I can tell the difference in the way the servo moves. The gyro sense is right and the servo reversing is right too. The funny thing is that I wound up lowering the head speed and I could actually get the heli hovering but the tail was still extremely unstable. I am at my wits end...wondering if the servo or the gyro might be bad????? Any help will be GREATLY appreciated!!!!



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05-31-2012 06:11 PM  6 years agoPost 2
paul medford

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Trinidad

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your tail bearings could be the problem, also make sure there is absolutely no binding in the tail

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05-31-2012 06:17 PM  6 years agoPost 3
wrongler

rrProfessor

Brewerton, New York

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Also check the servo to make sure its working the way it should.

Bill Whittaker

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05-31-2012 07:55 PM  6 years agoPost 4
TheROCKMAN

rrApprentice

Americus GA

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The linkage is as smooth as silk and the servo is operating in the correct direction. The bearings are in great shape and have no play or bad spots either.



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05-31-2012 08:36 PM  6 years agoPost 5
integy2

rrVeteran

California USA

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G770 - might have something to do with it.
If u can try out another gyro, will pin point easier.

(Good flight end up with ...... big smile :D)

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05-31-2012 11:05 PM  6 years agoPost 6
paul medford

rrNovice

Trinidad

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the tricky thing is that the bearings feel fine under no load ,its only when the tail spools up , that the CF force causes the bearing to bind. But try another servo or gyro as suggested, if it does not hlp you may have to change the bearing and make sure they are in the correct order.

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06-02-2012 01:47 AM  6 years agoPost 7
DaveW

rrApprentice

Newark, DE

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+3 on the tail bearing. unless you actually pull the grips off you'll neveer find it. it will act perfectly fine until its spooled up and the grip and tail blades put a load on the bearing and lock it up. seen it happen many times.

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06-02-2012 01:20 PM  6 years agoPost 8
TheROCKMAN

rrApprentice

Americus GA

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Wel it turns out it was the gyro. Swapped out a GY401 I had and it held fine.



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06-02-2012 06:34 PM  6 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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If you're using the Gyro Sense menu in your 9503, the gyro gain lead MUST be plugged into channel 7 (Aux 2) of your transmitter. This is the ONLY channel the 9503 will use for gyro gain when coupled to the Gyro Sense menu. When using the Gyro Sense menu, gain is controlled via either the flight mode switch (AUTO), or the rudder dual rate switch (RUDD D/R).

If you wish to use the GEAR channel (channel 5), you will need to enable the GEAR function in your transmitter (gain will be controlled by the GEAR channel endpoints) and use the GEAR switch to control the gyro. You can also enable the GOV function on channel 5. This will enable a GOVERNOR function in the Menu list, and will allow you to control Gyro gain out of channel 5 using the Flight Mode Switch.

-----

You should also verify that the thrust bearings in the tail grips are put together correctly. The inner and outer races have slightly different diameter holes. The race with the larger diameter hole goes on first, closest to the TR shaft. The race with the smaller diameter hole goes on last, closest to the TR blade bolt.

-----

Unless the 770 is just plain defective, it should work fine in the 500 if properly set up.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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