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Home✈️Aircraft🚁Helicoptere-MinicopterOther › Severe Maxi gyro problem (static electricity?)
07-17-2006 06:57 PM  14 years ago
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Kristjan

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Estonia, Tallinn

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Severe Maxi gyro problem (static electricity?)
Hi!

I encountered an unseen problem!
For the first time I started up the Maxi 2.

I have the SL 560 Micro gyro mounted on the gyro plate on the back of the heli as all of you.
Servo is JR8700G.

When I start the motor up slowly I can feel and hear small glicthes in the tail rotor movement. It glitches once per full tail belt rotation I think.

At this point I still have control over the tail.

But as soon as I give more RPM at some point (I think 2/5 of the stick throw) the tail servo locks VIOLENTLY to it`s extreme position. I tried to reverse the sense etc. but every time at about the same revolution range it locks to its extreme. Even manual command doesn`t help after the lock up. System must be restarted and then the gyro and servo work well again.

What is this?

I have a GY401 that I can try but I want to use the SL 560 on the Maxi. BTW the SL 560 and JR8700G both came from my Fury and they have worked flawlessly.

K.
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07-18-2006 10:35 PM  14 years ago
GMcNair

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Birmingham AL

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Start with the obvious and work from there.

Check the ground from boom to frames, ensure you have continuity via an ohmmeter.

Lubricate ALL bearings, especially in the tail. Don't EVER assume the bearings are well lubed from the factory. They never are, unless they come from Boca Bearings in the USA, which I am 99.9% sure these do not.

Verify that all bearings are properly seated, that you have no cracks in the carbon fiber bits (I use a blacklight and flourescent paint--cracked CF glitches badly), and that all components which are metal to metal have good solid contact.

Verify the connector from the rx to the gyro is not pinched, compromised, or other. A low voltage situation may reset the gyro, and increasing the working function of every servo during spoolup will put a drain on the rx pack higher than the drain when sitting idle.

As the strain on the heli's drive system increases with spool up, it can magnify problems in any of the above components.
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07-19-2006 04:30 AM  14 years ago
LoopZilla

rrNovice

Melbourne, FL

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How does it do spooled up with no main blades?LoopZilla
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07-26-2006 01:35 AM  14 years ago
pyaresquared

rrApprentice

Central Arizona

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It doesn't sound like a static electricity problem. I have run my Joker quite a bit without a tail boom ground, and I never had a glitch like that. (Although I have stopped that kind of risky business.)

If the belt is a little loose, it could be clinking on the inside of the boom and is most noticeable during startup, when everything else is relatively quiet.

Here is a list of my tail rotor trouble-shooting tips. Isolate the wiring. Try turning off heading hold. Try reversing the servo on the TX and the gyro. Is the tail rotor turning the right way? Are the blade grips facing the right way? When the gyro and tail servo are plugged in, does the tail rotor respond correctly to a slow yaw?
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07-27-2006 04:23 PM  14 years ago
Kristjan

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Estonia, Tallinn

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I have grounded the tail boom and it got way better.

I hovered 8 minutes with no problems except random (interval 30 sec to couple of minutes) ultrafast 5 degree rudder glitches. I don`t know what it is.

You are all running Futaba Gyros I guess, I have CSM SL560 Micro as I mentioned and a JR servo.

I will go and fly again to get a better view.

K.
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07-27-2006 04:39 PM  14 years ago
Colin Mill

rrVeteran

England

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Hi Kristjan

We find that the anti-static spray called Graphit 33 from Kontakt Chemie is very effective when simply applied to the tail belt. It is graphite loaded so don't get the overspray on the furniture

Best regards

Colin (CSM)
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07-27-2006 04:55 PM  14 years ago
Kristjan

rrApprentice

Estonia, Tallinn

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Found it on their website.

How to spray?
How often to spray?

Have you grounded your Joker or do you just spray?

K.
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07-27-2006 05:04 PM  14 years ago
Colin Mill

rrVeteran

England

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Hi Kristjan

We simply spray the outside surface of the belt all the way around so there is a conducting layer for the whole length of the belt. We have not so far had to repeatthe treatment but would do so if it became thin in any place.

On Raptors and T-rex it works well without any other anti-static precaution (we got a bit tired of grounding the boom, a main shaft bearing and a tail shaft bearing all to the engine mount - its a lot of extra work).

Best regards

Colin
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07-27-2006 05:41 PM  14 years ago
Kristjan

rrApprentice

Estonia, Tallinn

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I had a Raptor and it needed none of the precautions. Just fly...
On my Bergen I grounded the boom because it had a gasoline engine, still I never had any problems.

Joker scared me the first time.

Thanks for your input!

K.
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08-06-2006 05:03 PM  14 years ago
Kristjan

rrApprentice

Estonia, Tallinn

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No static electricity.
First changed the gyro to GY401.
No good.

Then changed the servo to S9253 and problem was gone

Plugged the JR to channel 4 and it acted weird.
It gave maximum throw although small stick input was given.
S9253 was OK.

K.
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