RunRyder RC
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0| helitom
rrApprentice Pine Grove, Calif, USA |
Servo Failure I fly Excel and Century machines. I have a Fury Expert that is all stock with the original FB head that has a gazillion flights on it. It started life with my trusty Futaba 9Z and has been moved upwards over the years and now is flown with my Futaba 18MZ. Anyway, this is not a "once-in-a-while machine"; it always goes with me to the field in case there is a problem with the other machines that came along for the ride or I just want to fly something that has no issues.Two flights ago, just before the Covid stay-at-home, I became a spectator when it rolled over and went in. I did all the repairs and tinkered with other stuff while waiting for our flying field to reopen. And, reopen it did. On the day of reopening, I took ol' faithful out. On the very first flight I once again became a spectator as it rolled over and went in.After making all the repairs - again - I got out the transmitter (in my shop) and turned it on. This is my standard drill when repairing a crashed heli to make sure everything moves as it should and the amount of movement is about the same as it was before the crash. I turned on the receiver and check the controls. All looked and worked just as I expected.At this point I got distracted by something - the shop TV, a deer heading for the flower box, one of the feral cats telling me the food bowl is empty. Anyway, I was looking at something else when I got a glimpse of the pitch cyclic servo moving to full stop in one direction. I moved the transmitter ail/elev stick around and the servo returned back to neutral. WTFO!! I sat there for another couple of minutes and it happened again. Whenever I waited a few minutes the full travel without command input repeated without fail.I replaced the servo and fooled with the heli for another hour or so without the problem recurring. So I, by pure accident, found the reason for the two previous crashes. Of course, a new servo fixed it. But, I have been doing models and RC longer than lotsa folks on this forum have been alive and have never seen a servo failure of this sort. I took the servo apart looking for a broken wire, a burnt or damaged component on the circuit board, or anything else that could explain this failure. I couldn't see anything wrong.Oh well, another life lesson - sh*t happens.......... |
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 Rojoalfa
rrKey Veteran Punta de Mata, Monagas-Venezuela |
helitom I took the servo apart looking for a broken wire, a burnt or damaged component on the circuit board, or anything else that could explain this failure. I couldn't see anything wrong. /I don't understand.The servo is bad or not??You need to test it apart to see if it is working OK.Either way, The problem is not solve and remain onboard.../ |
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 KJH
rrVeteran Interlochen, MI, U.S.A. 💎Sustaining Member |
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| helitom
rrApprentice Pine Grove, Calif, USA |
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| Rojoalfa
rrKey Veteran Punta de Mata, Monagas-Venezuela |
/Ok... Servo is dead. Dead meat.All servos are 4.8 volts, 6 volts, HV? Your battery is according to servos spec./ |
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 dschertz
rrApprentice Jackson, MI |
Rojoalfa All servos are 4.8 volts, 6 volts, HV?
Your battery is according to servos spec. |
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| rcheli808
rrApprentice Mililani,Hi-USA |
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| Rojoalfa
rrKey Veteran Punta de Mata, Monagas-Venezuela |
dschertz Seriously, what are you talking about? /Can't be more serious!!!One of my friend had similar problem to find out that rudder servo was 4.8 volts in a system with 6.0 volts.He use no step down, nothing.So, he kill the servo on the bench, then installed a new one and at the end, kill the trex heli while flying...... End of story./ |
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| helitom
rrApprentice Pine Grove, Calif, USA |
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 wjvail
rrElite Veteran Meridian, Mississippi 💎Sustaining Member |
helitom I just have never seen/heard of a failure mode like this - the servo randomly going full travel in one direction without transmitter input.  |
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| helitom
rrApprentice Pine Grove, Calif, USA |
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 jbjones
rrVeteran Columbus, Mississippi 💎Sustaining Member |
helitom Several successful flights in the last few days. Hoo-Rah!! |
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 heli4fun
rrNovice TRUMP, USA |
dschertz Seriously, what are you talking about? 
Yeah,there are times i can't "Decipher" what the hell he's talking about!Maybe he should work on his "English" rather than his helicopters... |
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 JLF92677
rrApprentice Southern California |
helitom ...the pitch cyclic servo moving to full stop in one direction. I moved the transmitter ail/elev stick around and the servo returned back to neutral. |
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