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HomeAircraftHelicopterAlignT-REX 700N › 700 going out of track...?
01-18-2010 08:45 PM  8 years agoPost 1
Band1086

rrElite Veteran

Kennewick, Wa. USA

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Just fixed my 700 after a crash. Looks good in a hover, but when cyclic is given, it goes out of track. When cyclic is let off, it comes back in track. Replaced spindle, all bearings, checked grips, all bolts, and rods for straightness all the way down to servos. Everything looks good and it flies good. Any ideas...??? Thanks

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01-18-2010 09:00 PM  8 years agoPost 2
snipealot

rrApprentice

Frederick, MD

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Did you check the head block? Just throwing that out there, I think I have heard of a similar issue by someone at my field. Changing the head block fixed the issue.

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01-18-2010 09:07 PM  8 years agoPost 3
Band1086

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Kennewick, Wa. USA

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The head block looks perfect, I can't see anything wrong with it at all...

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01-18-2010 09:19 PM  8 years agoPost 4
Pulento

rrVeteran

CHILE

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Check your thrust and radial bearings, when I loose track at maneuvers usually is a shot thrust bearing.

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01-18-2010 09:39 PM  8 years agoPost 5
Band1086

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Kennewick, Wa. USA

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Both are brand new...I guess it is possible to have bad out of the package, but probably unlikely. The radials were smooth and the thrusts looked very nice when I took them out of the package.

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01-18-2010 09:40 PM  8 years agoPost 6
jsenicka

rrProfessor

Eagle River, WI

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Possibilities (realize you have checked some)

1. Spindle
2. Bent grips
3. Bent grip posts
4. Bearings (radial and thrust)
5. Bent bolt in B/H mixer
6. Bent bolt in washout arm

Jim Senicka
Team Manager, GrandRC Flight Team

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01-19-2010 02:30 AM  8 years agoPost 7
gorn

rrElite Veteran

Western Australia

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the only time Ive sen this it was as follows:

Blade grip balls were slightly loose (was very hard to see it)
Bellcranks had loosened slightly
All ball links were sloppy

No this was not my heli lol, I just helped figure out what was happeneing.

For the love of the hobby

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01-19-2010 02:46 AM  8 years agoPost 8
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Look for bent or loose ball screws.

Dr.Don

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01-19-2010 05:48 AM  8 years agoPost 9
ball link

rrNovice

Tenn.

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check plastic servo horn wheels, they usually go bad after a crash.

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01-19-2010 06:26 AM  8 years agoPost 10
HiroboFreak

rrVeteran

Central Coast, NSW, Australia

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Symptoms of a bent blade grip post to me.
Also check your mixing arms.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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01-19-2010 09:29 AM  8 years agoPost 11
gotnoclue

rrApprentice

sydney

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i had the same issue with my 700 after a rebuild.
i was certain everything was in the right way but upon tearing down the head i had the thrust bearings in ass about(flipped on install)
it would track perfect but the second cyclic was applied it went out.

once i fixed it up it tracked perfectly.

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01-19-2010 02:37 PM  8 years agoPost 12
Band1086

rrElite Veteran

Kennewick, Wa. USA

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check plastic servo horn wheels, they usually go bad after a crash.
They were all replaced in the rebuild.
upon tearing down the head i had the thrust bearings in ass about(flipped on install)
All replaced with new, but that was the first thing I thought too.
Even new they might still be bad...not totally unheard of.
Symptoms of a bent blade grip post to me.
I looked very closely at them, they look perfect to me.

A friend of mine said he had the same problem, and for him it was a dampener issue. When he replaced them the problem went away.
I replaced them in the rebuild however.

It has been my experience that this problem is almost always a bearing issue when the rebuild it done correctly, but since I installed all new bearings I decided to start this thread to get different opinions on possibilities. I very much appreciate everyone chiming in. This is a very good forum, the knowledge given is excellent. Thank you all again!

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01-19-2010 03:13 PM  8 years agoPost 13
jsenicka

rrProfessor

Eagle River, WI

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I chased a bent bolt in a bell/hiller mixer for probably 30 test flights before I finally found it. Looked at everything else listed here and was pulling my hair out

Jim Senicka
Team Manager, GrandRC Flight Team

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