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HomeAircraftHelicopterAlignT-REX 600N › wabbling on evevator axis...
06-07-2009 01:13 PM  9 years agoPost 1
nadavbarak

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Israel

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Hi guys,
My friend's Trex600NSP has strong wabbling on the elevator axis during an autorotation.
it happen when the RPM is low neer the ground.
it is doesn't occur with Trex600N.
any ideas?
The blades are tighten well.
the dumpers looking good.
pitch collective -11 +11

Best regards,
Nadav Barak.

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06-07-2009 01:21 PM  9 years agoPost 2
brcg123

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Wagoner OK USA

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what you are experiencing is normal at low rpm's with the trex600, its because the tightness of the feathering shaft against the dampeners. be sure and grease them up for this to be at a minimum.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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06-09-2009 11:16 PM  9 years agoPost 3
bigdog714

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Rochester, MN U.S.A.

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Check your tracking too, at low rpms the tracking has a greater wobble effect

MD 800
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HD 500V2
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Avant 90E

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06-09-2009 11:30 PM  9 years agoPost 4
nadavbarak

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Israel

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Thank you guys,
the dumper are greased and the tracking is good also.
I had another Trex600N (not NSP)and we didn't experience such vibrations.
maybe I should post a video.

Best Regards,
Nadav Barak.

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06-10-2009 12:00 AM  9 years agoPost 5
baddynergy

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sierra madre, ca- usa

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Loosen the blades a bit. When holding the heli on its side, if you give it a sharp bounce they should fall under their own weight.

**Unattended children will be givin a shot of espresso and a puppy**

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06-10-2009 12:44 AM  9 years agoPost 6
duceduc

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Saitama-Ken, Japan

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Had a guy with same issue. He changed his almost new one piece black align dampners to the grey ones and all is good. Just a thought. It maybe new but worth a try if nothing else works.

Duc S
Do It! Do It!™
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RCK:24005615-01

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06-10-2009 01:04 AM  9 years agoPost 7
baddynergy

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sierra madre, ca- usa

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When using the stiffer black dampers this is normal at low head speeds. With the softer grey dampers the wobbling should be gone at lower headspeeds. But wiht the softer dampers you lose a some pop in the cyclics.

Wobbling at lower headspeeds is completely normal for a stiff head. A common way to get rid of some of it is too loosen the blades a touch.

**Unattended children will be givin a shot of espresso and a puppy**

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06-10-2009 01:06 AM  9 years agoPost 8
duceduc

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Saitama-Ken, Japan

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Wobbling at lower headspeeds is completely normal for a stiff head.
True. I wouldn't give up my pop for abit of wobbling on autos.

Or bang the chit out of it on a new dampners until it softing out.

Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01

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06-11-2009 08:28 PM  9 years agoPost 9
Duck Head

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Portland, OR USA

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[quote]
Or bang the chit out of it on a new dampners until it softing out.

+1

Team Westside Heli
Team Tammies Hobbies

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06-11-2009 08:33 PM  9 years agoPost 10
jackheli

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Vancouver - Canada

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It only happens at a particular head RPM. Check it out. Happens on mine as well and I find it useful, actually: it indicates the head speed is dropping below the acceptable margin and it is time to dip the heli in order to speed up the rotor.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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06-12-2009 04:05 AM  9 years agoPost 11
brcg123

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Wagoner OK USA

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it indicates the head speed is dropping below the acceptable margin
great point! that is exactly how I tell when its time to get to the ground, NOW.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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