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Home✈️Aircraft🚁Helicoptere-AlignOther › Trex 600 loosen pitch slider crank/ball
09-05-2006 01:30 PM  14 years ago
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tungym

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Trex 600 loosen pitch slider crank/ball
I was the second unlucky guy in the field with loosen pitch slider ball link/ crank junction.

I was practising auto. today and the tail rotor touch the uneven ground softly. This results in total lost of tail control at 1 foot above ground. Luckily only the balde strike and broken.

Post-mortum found the tail pitch slider ball escape from the crank lever socket. The pitch slider ball can be returned back into the socket at a certain angle without much force.

A week ago, another brother just had the same incident in the mid air. That results ina heavy crash with cracked carbon frame.

Any idea to improve the pitch slider ball/ socket to prevent another accident will be greatly appreciated.
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09-05-2006 07:34 PM  14 years ago
Adams

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Champaign Il. USA

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same issue
I had the same thing happen in flight this weekend. I was able to get the machine down with no issues and was surprised that the ball was out of the bellcrank. This happend in flight and the tail had never been in the ground.
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09-05-2006 11:07 PM  14 years ago
Lemmiwinks

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Cincy, OH - USA

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Reduce your throw on the tail rotor servo. If the arm is moving so much that the ball comes out of the socket then you need to change that.
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09-06-2006 12:52 PM  14 years ago
tungym

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I don't think is related to the throw as trave limit has been well adjusted.
I investigate the problem and found 2 important points:
1) The plastic tail hub is "soft", including the plastic part protruding from the tail hub holding the bell crank screw. Actually I can make the pitch slider ball half out of the socket with minimal downward force.

2) Also it lacks a triangular piece of plastic that prevent the protruding screw base from twisting (which present in Swift16 and raptor 50). I try my finger on a swift 16 EP and the bell crank feels rock solid. This is absolutely the plastic is too soft in Align Trex 600.

I am try some tricks to strengthen it from protruding screw base from twising ( 2 degree is enough to let the ball socket to fall 1-2mm down)
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09-07-2006 12:16 AM  14 years ago
docjoe

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Stockton, CA United States

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I had the same problem and I think the big problem is using that Cheesy soft plastic vertical tail fin. When I was adjusting my Gyro, it was accidentally reversed and when the heli spooled up, it piro'ed. However, when it did, the tail fin hit the ground, struck the tail blade and the slider broke. I have since upgraded the tail fin to the Carbon fiber one and have a metal tail slider/yoke on order. This should fix it.

Joe
Joe
We haven't seen Colonel Angus around these parts for years!
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09-07-2006 02:31 PM  14 years ago
Adams

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Champaign Il. USA

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pitch slider
I am using the carbon tail fin! In my case the tail has never been in the ground. I use a mat when flying off of grass and am super carful not to get the tail in the ground. I found that the servo was slightly over driving the linkage and flexing the bellcrank mounting post allowing the ball to slip out. I had another friend here at work have the exact samething happen in flight however he was not so lucky and had an ugly crash. I'd sure recommend checking this on your machines!
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09-07-2006 03:07 PM  14 years ago
RCHeliJim

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Orem, UT USA

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I found that the servo was slightly over driving the linkage and flexing the bellcrank mounting post allowing the ball to slip out.
I am glad you found the reason. ALL servos should be set so they dont bind - including the tail. I do agree that everyone should check their machines and make sure their tail systems dont overdrive in either direction. Not only can this pop the ball out of the slider - but it can also pop a link off a ball, or stall the servo out - causing premature wear and failure.

I am betting that most of the failures of this type could be attributed to what you found.


Go Fly, Have Fun!!
-Team Quick UK
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09-07-2006 04:49 PM  14 years ago
caseyjholmes

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Portland, Oregon

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I do agree that everyone should check their machines and make sure their tail systems dont overdrive in either direction
Every heli should have this adjustment performed before it's first flight, as part of the electronics setup. Limit your gyro travels!
Tail sliders don't like binding and it is possible to pop off the tail pitch control rod if you get too friendly with the limit of your travel allowance.
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09-07-2006 04:51 PM  14 years ago
RCHeliJim

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Orem, UT USA

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Limit your gyro travels!
My point exactly


Go Fly, Have Fun!!
-Team Quick UK
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09-07-2006 05:51 PM  14 years ago
jackheli

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Vancouver - Canada

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With CSM gyros you have precise and separate limit controls for the each side of the rudder servo travel. There is no way you will get the servo to bind since the limit setting is part of the inital setup of the gyro.It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.
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09-07-2006 07:29 PM  14 years ago
Adams

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Champaign Il. USA

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The issue is a little more complex than that. The tail rotor pushrod guides are fastened to the tail using a cable tie wedged in place per Align. In my case the cable tie fell out in flight and the pushrod guide rotated about 90 degrees thus when a hard over servo input was given overtravel at the tail occured. While it's true that the servos should be adjusted such that no binding occurs it's been common practice for years to overdriver the tail on the ground as reduced travel will occure in flight during rotation. This was the only way we could get high rotation rates without turning down the gain. Most gyros now have limiters (as does the JR 500T that I'm using)however in order to achieve the max rotation rate deisred with a gain value that would hold the tail, a long servo arm length was required and when the limiter is turned down fully the bellcrank still slightly overdrives.
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09-07-2006 08:55 PM  14 years ago
caseyjholmes

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Portland, Oregon

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I used one drop of CA glue to affix the tail boom pushrod guides in place instead of wedging a ziptie in there. Felt solid enough with a drop of glue. Don't use hardener/accellerant, that will weaken the over all bond.
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