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TREX-600 electric Tail Issue

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TREX-600 electric Tail Issue

Old 07-19-2010, 01:20 AM
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Default TREX-600 electric Tail Issue

<span style="font-size: medium">Ihave just recently completed the TRex-600 electirc heli setup.I initialset the GYROgain DX6i settingsto be both 80%. When Itested theheli for the first time Istarted to get severe tail wag at about 1/3 throttle stick. As Iincreased the throttle stick to 50% the wag translated into a severe counterclockwiserotation of the heli on its training balls. Ieventually backed the GYROgain settings down to 55% and 50% which stopped the tail wagging completely. The heli held the tail in straight-line position to the head all the way up to its lift-off. As soon as the training gear cleared off the ground the heli immediately translated again intoa severe counterclockwiserotation while off the ground, at which time Ijust cut the throttle to land immediately.

Can anyone offer some suggestions as to what the problem(s) might be that Ineed to look further into? I thought the GYROgain adjustment would have solved it but it only seems to partially address the issue until the coefficient of friction from the trainer balls is overcome by their lifting off the ground.

Any help please?</span>
Old 07-19-2010, 07:14 AM
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Default RE: TREX-600 electric Tail Issue

You should test if you are in heading hold mode. With power on, move the heli nose direction manually from left to right and right to left, and notice if the tail blades change direction. If the tail doesn't move, then you might have set your transmitter to be in Standard Rate mode. Should be noticable. With a Spektrum transmitter, HH mode is roughly 70%. 80% is too high and 55% is just borderline.

What type of Gyro to you have?
Old 07-19-2010, 07:17 AM
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Default RE: TREX-600 electric Tail Issue

Your gyro sense is backwards.

What gyro?
Old 07-19-2010, 09:19 AM
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Default RE: TREX-600 electric Tail Issue

<span style="font-size: medium">The GYRO is a Futaba GY401.</span>
Old 07-19-2010, 09:35 AM
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Default RE: TREX-600 electric Tail Issue

Give right rudder, the tail blades should change pitch so as to push the tail to the left. If thats wrong, reverse the rudder channel.

Put the gyro in HH mode and this will be easier to see.

Turn the nose the left, the tail blades should do the same thing they do when you give right rudder, if thats backwards, reverse the gyro NOR/REV dip switch (my guess this is the problem)

The above assumes the tail and tail drive are correctly built.
Old 07-19-2010, 11:24 AM
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Default RE: TREX-600 electric Tail Issue

I'd say first make sure your gyro is correcting in the correct direction, it souds as if it's not. Try reversing the direction on the gyro. What kind of gyro and tail servo are you using. Is it set up correctly per spec ?
Let us know what your gyro is and if it's correcting in the right direction, and we can go from there
Old 07-20-2010, 01:08 AM
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Default RE: TREX-600 electric Tail Issue



Thanks everyone for your ideas. Flipping the GYRO dip as suggested resolved the issues.Iput the GYRO setting on the DX6i to 70%as suggested, however the tail developed a lateral wag on the ground and in the air.So Ilowered the GYRO setting to 65% and the tail wagging went away and the entire chopper settled down to nice smooth hovering.Everything went well from that point forward for first flight. I am amazed at how stable and majestic in movement the 600 is. It flies so real and true to a full scale chopper.</p>
Old 07-20-2010, 06:17 AM
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Default RE: TREX-600 electric Tail Issue

Great !! [sm=thumbup.gif]glad to hear you resolved your issue with the tail, Send some pics of your bird when ya get a chance. Love to see it so I can be jealous LOL I only have up to a 500 for now.
Good flying
Jimmy R
Old 07-20-2010, 11:15 PM
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Default RE: TREX-600 electric Tail Issue

<span style="font-size: medium">Jimmy:

I'll try to take some new shots of it latertoday (Wednesday 7/21) and get them posted in the late afternoon or early evening.. </span>
Old 07-21-2010, 08:53 AM
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Default RE: TREX-600 electric Tail Issue

Here are a couple of shots from this morning's setupprogram shakedown Iam currently in the process of doing. Nothing much since Iwantto keep it close to the ground until Ihave the complete setup correct for me. Enjoy!

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Old 08-02-2010, 08:28 PM
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Default RE: TREX-600 electric Tail Issue

Here is something that I did, I mounted my gyro inverted on the front part of the tail boom.

I had read it would shield the gyro from the main blades in the event of a misshap.

Well it also had a similar effect of reversing then gain direction, so I had the same "spin around" .

It was an easy fix.

Harry

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