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Hirobo Embla - SRB Quark - Lepton
› Quark: flying great then tail won't hold
01-16-2009 01:59 AM  9 years agoPost 1
Al P

rrNovice

Iowa, USA

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Last night I was hovering in all orientations outside, when I had to set it down fast and hard on concrete. Landed upright on the landing gear, but popped the windshield out of the canopy. The windshield popped back in, but now the tail will hold only about 45 seconds,then it will pirhouette left (the nose yaws left) with the rudder stick having no response. The tail blades are fine, the tail gearbox and bearings seem fine, I removed the boom and can't see any problems. The motor, however, seems to get a bit screetchy sounding when the tail won't hold. If I reset the controller and start over, it will fly ok for about 30 seconds, then the tail will let loose and the heli will spin in circles.

Coincidence ? I'll guess there's somewhere over 100 flights on the heli. Is the tail motor finally going out ? Did the hard landing on the skids damage something electronic ?

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01-16-2009 09:45 AM  9 years agoPost 2
larry2375

rrNovice

honolulu

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check the main gear, maybe one or two teeth are stripped. i had something similar happen to my trex.

larry

blade cx2, blade cp pro w/dx7, trex 450se, rf g3.5

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01-18-2009 01:34 AM  9 years agoPost 3
MRC-Hirobo

rrKey Veteran

Edison, NJ

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the gear could be slipping on the shaft. check it and glue it!
thanks

MRC Host

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01-19-2009 08:53 PM  9 years agoPost 4
Al P

rrNovice

Iowa, USA

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Thanks for the tip. I removed the tail boom and gearbox to find the pinion was slipping on the tail driveshaft.

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01-19-2009 09:08 PM  9 years agoPost 5
MRC-Hirobo

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Edison, NJ

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EASY FIX, I'm Glad your back in the air!

MRC Host

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01-21-2009 02:33 AM  9 years agoPost 6
Inkmann

rrApprentice

Western, Massachusetts U.S.A

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Did you use glue to fix the slipping gear?

Thanks John. Currently Piloting Hirobo XRB Llama, SRB Quark & E-Flite mSR, 2 Blade CP,s

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01-22-2009 01:50 PM  9 years agoPost 7
Al P

rrNovice

Iowa, USA

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I didn't have any glue handy, but I found some very sticky hook and loop adhesive. I got enough of the sticky to adhere to the shaft and pressed-on the pinion gear. Will use a drop of glue when I can get some.

I wonder... was this a press-fit from the factory ?

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01-22-2009 02:44 PM  9 years agoPost 8
MRC-Hirobo

rrKey Veteran

Edison, NJ

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They should be glued at the factory but sometimes the glue slips or someone didn’t put a generous amount of glue on it.

MRC Host

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01-22-2009 04:54 PM  9 years agoPost 9
Al P

rrNovice

Iowa, USA

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MRC... thank you for your monitoring of these threads and prompt replies. The tail seems a bit jumpy. Instead of being smooth and stationary, it jerks every few seconds but the gyro returns it to the original postion. It jerks aprox. 1/2 to 1'' at a time. It's done this since I received it new. Is this normal ? If not, what can I do to smooth it out ?

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01-22-2009 05:23 PM  9 years agoPost 10
MRC-Hirobo

rrKey Veteran

Edison, NJ

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It could be a few things. Is you antenna free and dropped out of the small hole at the bottom of you canopy? The radio could be picking up interference.
Or you may have to adjust your gyro sensitivity.
Turn on your transmitter.
Turn on your quark on a flat surface and don’t more until the flashing green turns to solid green.
Press the start switch makes sure your throttle is at the lowest setting when you do this.
Press the start switch again until the RED led starts to flash.
Now you are in gyro sensitivity mode.
Use a small screw driver to adjust the RUD ATT screw. (The rudder rate adjustment now turns into the gyro sensitivity adjustment when you are in this mode.)
Just go though trial and error to find what is best for you.
Once you have found the best setting for your tail hold you have to save the setting by holding down the start switch and the pressing the power button to turn the power off. Then you are all set.

Let me know how this works for you!

MRC Host

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01-24-2009 11:57 AM  9 years agoPost 11
Al P

rrNovice

Iowa, USA

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The RUDD ATT adjustment helped. Thank you !

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Hirobo Embla - SRB Quark - Lepton
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