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T-REX 600 › Is my bent TT within tolerances?
08-29-2017 10:46 PM  80 days agoPost 1
InvertedDude

rrApprentice

USA

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I purchased this TT 600 from Amainshobbies.com.

They informed me looking over the video that it is within tolerances so no replacement offered upon my request.

Well I just order a new complete belt drive unit from another business to swap out the TT on my Trex600 ESP.

$92 total shipped.

I will let the video speak for itself.

Helicopter moves vertical up and down on the tail end, pretty annoying to fly it! Swapped out to original 700TT/Boom, helicopter flies normal.

RR does not let me upload MP4 video so you will have to DL from a separate browser window. Right click link to open in another browser.

https://drive.google.com/file/d/0B5...iew?usp=sharing

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08-29-2017 11:41 PM  80 days agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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Cant see video...well actually it wont play.

Wondering...

What tolerances numbers they used?

How many bearings were being used and their position within boom?

~~Enjoying the hobby one flight at a time~~

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08-29-2017 11:51 PM  80 days agoPost 3
InvertedDude

rrApprentice

USA

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Pistol Pete

I tried 1,2 and 3 bearings in video.

What OS is your computer running? The mp4 video works.

Watch at YouTube

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08-29-2017 11:56 PM  80 days agoPost 4
JuanRodriguez

rrProfessor

The Villages,​Florida

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Looks to be about 2 thou or maybe 3 runout.....

I know there is a certain amount of "slop" where that spline goes into the drive dogs (front and rear) so I don't know if what you are seeing is acceptable or not.

Guess we'll need the "experts" to chime in.....

Nevertheless, pretty chinzy to see that Amain is not replacing it for you just for the sake of good customer service.......thumbs down to them !

Been there, done that and old enough to know better.....

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08-30-2017 12:00 AM  80 days agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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Im using a Samsung Tablet A...so android.

Seems to be the end fitting versus tube. I have a new TT...will check by tomorrow and chime back.

~~Enjoying the hobby one flight at a time~~

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08-30-2017 12:10 AM  80 days agoPost 6
InvertedDude

rrApprentice

USA

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JuanRodriguez

Just saying, I am a good customer with a loose wallet. They lost $92.00 today for over $15.99 plus shipping. I am a honest person.

Whatever!

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08-30-2017 01:40 AM  80 days agoPost 7
wjvail

rrKey Veteran

Meridian,​Mississippi

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Hmmm... If you are having problems and they are solved by replacing the TT, I guess it is too much. Still, I would have to say your torque tube is just fine.

Are the bearings on your two torque tube spaced the same? Does your tail fin buzz?

"Well, Nothing bad can happen now."

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08-30-2017 02:06 AM  80 days agoPost 8
InvertedDude

rrApprentice

USA

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wjvail

Anything below 75% throttle curves causes tail to up kick and down in a vertical motion. No tail wag like gyro gain is up too high.

If I speed up the rotor disk to 85% or high it is smooth.

I removed the 600TT and tail case to see if the rotor head was out of balance. It is pretty smooth once the blades are centered. Doesn't matter what throttle settings, smooth...

So I reinstall the 600 TT....same business....I take it off and put on a 700 boom and TT, the helicopter is smooth.

You tell me what you think?

I am willing to show videos of the helicopter with 600TT and 700TT, you can see the difference!

I tried different spacing upward of 3 separate TT bearings in the boom. I tried everything!

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08-30-2017 02:29 AM  79 days agoPost 9
wjvail

rrKey Veteran

Meridian,​Mississippi

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I think you have a damper issue but I'm only guessing. I wonder if changing boom isn't changing the helicopters CG.?.? That will affect damping and could cause porpoising or nodding. I wonder if changing the boom to a longer or shorter one isn't changing the load on the head and its dampers.

"Well, Nothing bad can happen now."

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08-30-2017 12:34 PM  79 days agoPost 10
870heli

rrVeteran

Monson Ma. USA

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It sure looks good. I wouldn't think that would make anything shake.

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08-30-2017 01:40 PM  79 days agoPost 11
wjvail

rrKey Veteran

Meridian,​Mississippi

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Exploring this a bit more... I've reread your original post. Do I understand correctly, you put a 600 boom and torque tube on a 700 helicopter? Your helicopter originally had a 700 boom and TT and it flies fine in that configuration but putting a 600 boom on it causes an issue - is that correct?

Do you have a 700 with a shorter boom or a 600 with a longer boom?

"Well, Nothing bad can happen now."

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08-30-2017 01:53 PM  79 days agoPost 12
Tyler

rrElite Veteran

Chicagoland area

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Looks good to me, I would support A-Main on this one.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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08-30-2017 03:10 PM  79 days agoPost 13
InvertedDude

rrApprentice

USA

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wjvail

https://rc.runryder.com/helicopter/t819955p1/

Before we start getting into all the questions. Pls read the original link of the helicopter history.

The helicopter is an actual 600ESP, but the guy sold me based on a lie saying it was a 700E. This was my first helicopter in 10 years since I left the hobby. If I would have done better research, I wouldn't have been taken to the cleaners.

I am converting it back to actual 100% OEM Trex 600ESP.

The original configuration sold to me with a RJX head swinging 685mm blades with a slightly cut down 700 boom and full length 700 TT with all 600ESP gearing.

If I use the original 700 boom and TT, it flies fine and very smooth. If I use the new in package 600 Boom and TT. I get wobbles up and down motion until the head is screaming.

The tail blades are moving past 4 revolution per single main blades revolution. Having 2 to 3 thou off is enough to make a helicopter have the shakes.

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08-30-2017 04:31 PM  79 days agoPost 14
balsapro

rrVeteran

Gallatin,TN

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I just looked at your vid the TT is ok.

also looked at some of the pics in the other post. one pic shows the tt with two bearings close to the center (kind of to close). I would double check all the bearings in the main and tail grips to make sure they are installed correctly.

what main and tail blade size are you currently running.

I would install everything as per the manual.

Build the Best, Fly the Best, Crash the Best

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08-30-2017 05:37 PM  79 days agoPost 15
InvertedDude

rrApprentice

USA

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balsapro

Align 600 white/black CF

Align white/black 95mm CF tail blades

Tail grips and tail housing has been dismantled and rebuild with new bearings.

Main rotor bearings have been replaced....even the metal blocks that hold these bearings have been replaced.

Main rotor grips/head has been dismantled and rebuild but I did not replace my dampers.

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08-30-2017 05:53 PM  79 days agoPost 16
Rojoalfa

rrApprentice

Punta de Mata,​Monagas-Venezuela

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/
/

That is not the way to test your TT.

First... Check for bend on a flat surface.
It is not easy to repair a bend TT but you can try...
Second... Check position of bearing and space According to manual.
And. .. Check bearing and replace if damaged.
Don't forget to glued bearing on TT.

/

Saludos cordiales,

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08-30-2017 06:06 PM  79 days agoPost 17
EEngineer

rrProfessor

TX

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Could the 600 tail boom be slightly bent?

Logo 600SXs, 800XX, TDR IIs

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08-30-2017 06:16 PM  79 days agoPost 18
Dawiev

rrApprentice

Middle East

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Second... Check position of bearing and space According to manual.
It is pretty well known that to space them symmetrically, can cause issues. Offset their placement so that they are not the same distance across the TT.

IMHO, a bent TT will cause a high vibration in the tail that you can see in the tail fin, not an up-down movement. I would rather look for Elevator gain too high, or something in the head.

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08-30-2017 06:36 PM  79 days agoPost 19
InvertedDude

rrApprentice

USA

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Dawiev

Just curious?

I am using a 10T pinon and 170T. Most people use 11T pinon, is it possible my headspeed is too low for the align head to cope? If I set the throttle curves past 85% it is smooth non shaking or wobbling at tail up and down.

With my Raptor 50 Titans, I can set the head speed at my preferences.

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08-30-2017 07:06 PM  79 days agoPost 20
InvertedDude

rrApprentice

USA

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Swapping heads

Took me about 15 minutes total, mostly sanding the Raptor 50 washout arms to fit Align's washout arms. I got like 4 raptor 50's of parts laying around, just built a head and installed it on 600ESP.

Flew it.....

Can't complain!

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T-REX 600 › Is my bent TT within tolerances?
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