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HelicopterAlignT-REX 600N › Jumping and Twitching 600N
12-30-2010 11:14 PM  6 years agoPost 1
doc-b

rrNovice

South Loosiana

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I just bought a 600n RTF . I installed my Futaba 8 FM channel Radio and Receiver. after setting up the radio and heli. , I picked it up in hover. After a little while it began tail twitching and jumpimg up and down rather rapidly, then hovering normal again. This happened several times. I got scared, purchaced a new receiver and Radio. Havnt tried it yet

Any ideas as to what the problem could have been. The area I was hovering was an area my friends fly regularly with no problem

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12-31-2010 05:48 AM  6 years agoPost 2
Heli Davey

rrApprentice

springfield,mass

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Its it belt drive or torque tube?

*TREX 500ESP*TREX 600NSP*TREX 700N LE*

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12-31-2010 10:40 AM  6 years agoPost 3
doc-b

rrNovice

South Loosiana

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It is Belt Drive. But I dont think that is problem because it also would jump up and down during a hover, very rapidly about a foot or more . Also when I was attempting to start it, not moving any controls ,the servos began jumping for a split second. Im thinking it is either the radio or receiver but which 1 and how would I know.

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12-31-2010 11:20 AM  6 years agoPost 4
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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Sounds like severe static build up around the belt drive. Try a shot of silicone spray lube in the tail boom. Also make sure the belt is tight and not flopping around.

Static build up tends to be a little worse in the winter months, due to lower humidity. If the spray lube cures it, do some looking around and you will find the various ways people ground their tail booms to help.

Don't come off the throttle untill you see your GOD!

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12-31-2010 03:06 PM  6 years agoPost 5
DGS

rrNovice

Hamburg, NY

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If it was glitching before you started the heli, I'd guess that you have a radio problem and not static. Try to find/borrow a 2nd receiver and plug some servos into it. If it's still jumping then your Tx is the issue. Problems like these, you usually need the 'process of elimination' to solve. Good luck with it.

Dave S.

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12-31-2010 05:33 PM  6 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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A 72 MHz FM system. The good old days, and it should be rock solid. It's time to do the "find the glitch maker" drill.

Look for loose metal-to-metal, or in the case of the 600, loose metal to carbon fiber joints, and fix them.

Perhaps somewhere in your mechanics you have a bad, dry bearing that is creating electrical noise.

Your battery pack may have a loose spot weld, or your switch harness may be at fault. If you are not using a heavy duty switch harness, now would be the time to switch to insure that your switch harness can handle the current (if you have all digital servos installed).

Route the receiver antenna as far away from all electronics as you possibly can, route it out the rear of the heli, stretch it out its full length, and don't wrap it around boom supports or other heli parts.

Believe it or not, a ferrite toroid with the gyro to receiver leads passed through it for several turns can also clean up the power and signal leads to your receiver.

There is no reason a 72 MHz FM system should not operate reliably and glitch-free in a helicopter.

If you have the front gyro mount (plate mounted between the side frames just above the pitch/roll servos, consider moving the gyro away from that area, perhaps behind the main shaft, on top of the tail boom mount.

What servos are installed? Some newer high-speed, high power consumption digital servos are not fully compatible with FM/PPM systems. Not because of the pulse width/centering width items, but because the servos themselves are electrically noisy and can generate trash on their cables going back to the receiver that can wreak havoc with the receiver's decoder.

Make sure the receiver's crystal is fully inserted and not able to come out due to vibrations. Wrap your RX in foam rubber to isolate it from vibration.

Was the receiver ever in a bad crash? It so, it is possible there is internal damage. Futaba FM/PPM receivers used small ceramic filters as part of their RF signal processing that were prone to damage in a bad crash.

You mentioned that you bought a new radio and receiver. What kind? A 2.4 GHz system?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-31-2010 07:24 PM  6 years agoPost 7
doc-b

rrNovice

South Loosiana

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The servos are
ACE DS 1111 on head
Logictech 6100 G on tail

Yes the receiver came out of a Raptor 30 that had a very severe crash.

Reason for crash I thought was a dead or weak battery.
Looking at the receiver, I could see no damage

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12-31-2010 07:26 PM  6 years agoPost 8
Zaneman007

rrElite Veteran

Texas - USA

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You say you got it RTF. Would that be used?

I'd tear it down, and examine everything. You could have an exposed wire or short somewhere. CF frames have been know to chew through wires.

IMO - RTF's should be torn down and rebuilt. It is cheaper than a new heli.

Old Guys Rule!

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12-31-2010 08:13 PM  6 years agoPost 9
sailorboy898

rrNovice

Salt Lake City, Utah USA

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I second the static theory.
I had a heli go weird on me in the winter (belt drive)
Fixed it be grounding the tail boom and using some silicone spray.
It was on an electric and I grounded the tail boom to the motor.
So I don't know on a nitro where to ground it to.
But I haven't had a glitch since.

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12-31-2010 10:27 PM  6 years agoPost 10
doc-b

rrNovice

South Loosiana

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yes It was used . But I replaced the Receiver with my receiver.

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12-31-2010 10:35 PM  6 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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The 600N hasn't been known to be a helicopter plagued by the mysterious static discharge stuff.

Rarely did anyone even experience static electricity related problems with a 72 MHz FM system as the OP is using.

It's a used heli, the electronics (servos) may be suspect, as would be the laundry list of things to check that I noted earlier, above.

The OP noted this heli was "RTF". Exactly what was included in the purchase with regard to electronics has not been stated.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-01-2011 03:34 AM  6 years agoPost 12
Zaneman007

rrElite Veteran

Texas - USA

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In addition to checking looking every thing over, you might consider sending the Rx to be looked over by Horizon hobbies.

Old Guys Rule!

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01-01-2011 06:12 AM  6 years agoPost 13
Zaneman007

rrElite Veteran

Texas - USA

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oops

Old Guys Rule!

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01-01-2011 06:35 AM  6 years agoPost 14
dkshema

rrMaster

Cedar Rapids, IA

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Futaba -- needs to go to Hobby Services, not Horizon.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-01-2011 01:41 PM  6 years agoPost 15
HeliKane

rrApprentice

Traverse City, Michigan - USA

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I had a smilar issue a few days ago with my 600. It turned out to be the tail servo connection at the regulator. I have a Fromco regulator and the connections loosened up over time. I pressed the wires back in and hot glued them in place. Problem solved.

Is the vertical jump happening at the same time as the tail twitch, or is it happening independently?

Steve

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01-01-2011 09:49 PM  6 years agoPost 16
doc-b

rrNovice

South Loosiana

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No it happens at different times. It might tail twitch and a minute later I would get a vertical twitch. I checked the wires at the receiver and they are all secured

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01-05-2011 02:16 AM  6 years agoPost 17
heliflyer7

rrApprentice

North Carolina

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Same problem with my E-converted Shuttle. During the conversion, I also upgraded, big time, from a Futaba G153 to an Align GP780. Random tail twitching began. I was fortunate enough to notice a tiny arc between the belt and inside of the tail boom at dusk one evening.

Shot belt with Static Guard brand spray, problem completely disappeared. This has all happened on chilly, low humidity days. Shouldn't be a prob. during the summer. Good Luck with this!

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01-08-2011 01:13 PM  6 years agoPost 18
doc-b

rrNovice

South Loosiana

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No more Jumping and Twitching

I Bought a new Radio, (Spectrum DX7), put in a AR7000 Reveiver. I checked the Belt.
No rubbing of the belt to the tail boom was noted. That eliminated the static theory.

No more twitching or Jumping. Much more Stable. Thanks for the help and advise

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01-08-2011 02:16 PM  6 years agoPost 19
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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Cool, you will really enjoy 2.4 and not having to worry with glitches and such. I think you made a wise spending decision in regards to your chosen hobby.

Just for reference, The tail belt does not need to make any contact with the boom to generate static. Actually it is more likely to produce static by not touching.

Don't come off the throttle untill you see your GOD!

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