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Post by majic1 on Jul 15, 2012 15:23:51 GMT -8
I took my V200 out this morning. Got it up in a perfect hands free hover, then after about 20 or 30 seconds, I heard a pop and the heli started spinning clockwise very fast. It's as if I were applying full right rudder while in a hover. Thankfully, I was able to bring it back down and land it without crashing! I still don't know how I did that? I didn't know I could do high speed piro's?
I put the heli back on the pad. Spooled it up very slowly, and sure enough, as soon as I start applying throttle, the rudder moves all the way to the right. When I back off on the throttle, the rudder goes back to center. It's like the throttle and rudder channels are being mixed somehow? Or, the rudder is responding to input from the throttle channel?
After I brought it back home, I plugged my Devo 8s into my computer and tested it with Phoenix to see if it was the Tx causing this. And no problem there. Everything in the sim was okay. I wonder if the Rx has gone bad?
Have anybody heard of this happening before?
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Post by cds1950 on Aug 1, 2012 12:45:34 GMT -8
Sounds like what my Uflys did on its first flight. The problem was the small cone gear that drives the shaft for the tail rotor. I coud not see any problem until I forced the tail rotor to turn and expose the part of the cone gear that was against the mail gear. I also noticed that when I turned the main rotor the tail rotor did not turn. You should make sure the the cone gear is engauged against the main gear firmly. WOW issued a notice to check this gear meshing before flying the Ufls. I thought i had done it correctly but I must have not done it correctly. I put a new cone gear in and also bought a new main gear just in case. I hav put about 10 or 12 hours in total on it since the change and not problems. Apparently yhis is common on the 3 cell version of the Ufls as the gear has trouble handling the additional poer of the 3 cell motor. Good luck and let us know if this is your problem.
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Post by majic1 on Aug 1, 2012 15:13:50 GMT -8
Thanks for the input Dale. All the mechanical possibilites have been exhausted. Someone in another thread had mentioned the possibility the gears were slipping. I inspected all my gears and they were fine. I had just replaced the main and the cone gears 3 flights earlier, so they were already pretty new. Just to be sure, I replaced all 5 gears again. I also replaced the the tail gear frame, replaced the bearings. I even put a new set of tail blades on it. All of this did nothing. I centered the tail servo horn, disconnected it from the Rx, bound the heli to the Tx and spooled it up. Everything was working fine and no tail movement, which means the problem is not mechanical. Dave has a heli with the same issue we are both trying to resolve. He tried changing out the Rx, Tail Servo and ESC and again with no results. This problem has us both baffled. He has been talking to Walkera engineers trying to figure this out.
Hopefully we will have an answer soon...
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Post by majic1 on Aug 5, 2012 11:50:47 GMT -8
Update, My V200D03 is back up and flying again! ;D
Apparently, although the V200 that Dave has and mine were exibiting the same symptons, they appear to be caused by different problems. I unplugged the tail servo from the Rx, then plugged the elev servo into the rudd channel on the Rx. Spooled it up and had no strange servo movement other than normal rudder input. That told me it was probably a bad tail servo even though Dave had already tested that theory on the V200 he has with no results.
I didn't have a spare tail servo. The original tail servo that came with my heli only lasted about 6 weeks before the servo motor froze up. The servo that is now giving me problems is the replacement, which is now acting wierd. I decided to take the servo motor out of the one that's acting up and put it in the original servo and ba da bing, I now having a working tail servo. Reassembled my heli and everything is working normally again. Just another bad tail servo.
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