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JR-Spektrum . E-flite . Fast Lad Performance

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e-Hirobo SRB Quark - Lepton - XRB Coaxial > S.R.B. Quark spining hard left
 
 
tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		Well, here's an issue.

(I also posted this at RCGroups, but in case MRC-Hirobo is monitoring, I thought I'd post this here too.)

Was flying outside today, and my Quark developed a case of the spins.

At throttle up, it starts to spin left immediately, and if I get it to 2" - 6" altitude, it just continues. It's a full left rudder action until I put her down or throttle down. It does this every time, with every battery, including the stock, original one. The spin is counter-clockwise, looking at it from above. Fast pirouettes.

Troubleshooting:

Transmitter is stock, fresh rechargeable batteries.

On the bench, connect battery, switch on the Tx, and when I press and release the POWER switch, get the red and green LED's OK, but I hear small tch, tch, tch noise from the S.R.B. Control unit. Noise is intermittent, and sometimes it stops, but then starts again. In a quiet room, it's loud. Something is going on inside there. Sounds almost like servos, but the servos do not move. Nothing moves, Noise is not from the tail motor, or the servos. It's from the front, from the Control Unit.

When I move the Quark antenna, or TX, the tch, tch, tch noise continues. When I stop moving everything, the noise still continues. (Intermittent, of course)

When I press and release the START switch, get steady green LED and the tch, tch, tch noise continues. When I hold the heli and throttle up, it wants to twist out of my hand. Full right rudder does not help much at all, that I can feel. Full left rudder results in tail rotor slowing almost to a stop.

Several times, after pressing the start switch, but with throttle down, the red LED's blinked with the tch, tch, tch sound. Doesn't happen much, but did happen three or four times.

I.a.w. page 26 of the manual, I adjusted the RUD NT clockwise. No effect, no change, no improvement. It was horizontal, and I turned it all the way, clockwise, then back to horizontal.

I.a.w. page 40-41 of the manual, I adjusted the RUD ATT. No effect, and no change.


Anybody have any ideas what's going on?

BTW, this problem was preceeded by a wonky tail rotor problem, where the tail rotor seems to have a mind of its own, speed-wise. It seemed to wind up and down. The gear teeth at the tail rotor and shaft were a bit worn, so I put in a new shaft and tail assy. Didn't help.
05-03-2009 02:09 AM
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simages
Veteran
Location: NY USA

My Posts This: Topic  Forum		MRC-Hirobo might be able to help, send him a PM......

How's the tail shaft and gears?

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05-03-2009 03:26 AM
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tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		Looked at the tail shaft and gears last week.

This problem was preceded by a wonky tail rotor problem, where the tail rotor seems to have a mind of its own, speed-wise. It seemed to wind up and down. The gear teeth at the tail rotor and shaft were a bit worn, so I put in a new shaft and tail assy.

Didn't help.
05-03-2009 05:42 AM
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tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		Spinning update - probable fix

Here's why the new tail drive shaft assy and new new tail unit assy didn't fix the previous tail rotor problem: The new tail drive shaft assy included a black plastic gear at the tip that was completely loose!

I'm sure that is the reason for the uncontrolled pirouetting. And a lesson for Quark owners. That shaft assy was brand new, and it arrived OK, (with the gear not loose) but was not adequately glued at the factory. It came unglued, and result was no control of that tail rotor, and slow rpm's for the tail rotor. (I'm not sure why the tail rotor would spin at all except for friction between the shaft and gear).

Thanks Simages!

I CA'd the gear to the shaft; waiting for it to set up and cure now. But I'm sure it was the cause of the uncontrolled spinning (pirouetting). Well, I'm pretty sure.

Still wondering about the noise coming from the control unit.
05-03-2009 06:07 PM
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simages
Veteran
Location: NY USA

My Posts This: Topic  Forum		Eureka!

I'm sure that was it.... and hope the controller is ok...

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05-03-2009 06:29 PM
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DaveESPI
Heliman
Location: Latham, NY

My Posts This: Topic  Forum		The noise is because it is trying to initiate and sync the gyro, but can't because the tail rotor/ motor isn't dialed in properly, and you may have messed witht he pot adjustments too much. try resetting them to factory settings and then make small adjustments from there.

Fly it like its a Sim, Crash it like yer Rich !
05-04-2009 12:50 AM
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tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		Update - Quark spinning

The Quark is fixed. Flies so great I promptly crashed it. So, I've got some tail rotors to epoxy back together. And, order more.


Root cause of uncontrolled pirouetting was the black plastic gear at the tail end of the shaft had come unglued. So far, the CA has held, in fixing it.

DaveESPI, that's logical. How do I get it back to the factory settings, other than just trial and error? The four screws look like they did, (slots are all horizontal) but of course, they might be off a hair, and I understand that's enough to make a big difference.
05-04-2009 01:39 AM
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simages
Veteran
Location: NY USA

My Posts This: Topic  Forum		Believe he was referring to the control unit; see page 42 para 14-2 "Resetting the data" However; do you still have the noice coming from the unit?

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05-04-2009 04:45 AM
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MRC-Hirobo
rrAdvertiser
Location: Edison, NJ

My Posts This: Topic  Forum		Hello everyone.
I have heard of a few cases of this problem. The problem seems to be isolated. Hirobo Japan is aware of these cases. The great part about this is that this is an easy 30 second fix.

If your quark spins and you hear a wineing from the tail motor chances are that your tail shaft gear is slipping.

Simply:
Take off your tail boom
Slide out your tail shaft. find the loose gear on the shaft
Apply drop of CA or "super glue"
Put back together
GO TO TOWN with your fixed Quark.

Please PM me or call me at MRC if you have an further issuers with your quark.

732 225 2100

-Greg G.-
05-04-2009 11:06 PM
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tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		Simages,

Control unit is quiet now. Bench-flew it today, (weather outside is windy) with epoxied tail rotor. Throttles up great, steady, but the gyro is set up too high, and will have to adjust it. When it first starts up, it twitches hard enough to jerk the heli around just a bit, briefly. The spinning is definitely fixed, with the fix that Greg just posted, and the control unit is not making noises. Assuming I get the gyro dialed in, all seems to be OK, (well, except for this blankety-blank wind)

Waiting for more tail rotors from A Main Hobbies, and last shipment got here real quick.

Also, ordered this battery, and sounds like the perfect Quark battery, (if you have Balr14's connector):

Thunder Power "ProLite V2" 2S Li-Polymer Battery 20C (JST Connector, 7.4V/730mAh) (THP730-2SJPL2) = $22.99.
05-05-2009 12:33 AM
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DaveESPI
Heliman
Location: Latham, NY

My Posts This: Topic  Forum		TLR, good to hear you are back up and flying again

Fly it like its a Sim, Crash it like yer Rich !
05-17-2009 03:58 PM
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tlr-boise
New Heliman
Location: Boise

My Posts This: Topic  Forum		DaveESPI,

Thanks. Yep, I've been flying for a while. Have crashed some, including one where it zoomed into a rock (I zoomed it, inadvertantly, of course; tried to fly nose in and . . . can't yet.) and broke the stabilizer. That was a three day wait for a replacement. But, I've got spare batts, spare rotors, main and tail, and now I'm flying and not crashing so much. Also just got the Phoenix sim, this weekend, and if the Blade 400 and others are ANYTHING like the ones on the sim, then I'm REALLY IMPRESSED with the Quark. I crash those sim helis in seconds. Don't get them yet, at all.

The Quark is fun, and cheap to fix when it crashes. And, I can fly it in my driveway and around the street. And, one of these days, I'll change the settings and really go for it.
05-18-2009 03:42 AM
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Ace Hobby . Thunder Power RC . Mikado Modellhubschrauber

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e-Hirobo SRB Quark - Lepton - XRB Coaxial > S.R.B. Quark spining hard left
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