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HomeAircraftHelicopterHelicopter Main Discussion › Create static discharge on the bench ?
09-20-2013 09:31 PM  5 years agoPost 1
Nasty1

rrApprentice

Enf,Ct-USA

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Had the last 3 flights end in a crash form a "right aileron " input that I did not give the command for,

Tore all my wires apart to find no chaffed wires,

Wondering if I can simulate a static discharge on the bench, and how can it be done ?

My setup
Fury55 FB
OS55hz
Multigov pro spectrum crank sensor,
Quark, jr8900g on tail
Jr8717 cyclics
Ds620 throttle
ReactorX
Futaba 7008sb

1st event, End of the tank of fuel, hit throttle hold, 80 foot up for auto, the whole decent I felt unconnected with the machine, it crash landed on its side, Found a popped off link, Blamed it on the link,
2nd event, About 4 minutes into the flight, felt a disconnection from the machine, got it on the ground first then hit throttle hold, at this time the rotor head tilted extreme right, and blade tip damage accrued.
3rd event, about 5 minutes into the flight, felt disconnected from the machine, got it about 5 foot off the ground, hit TH. HELI slammed into the ground from a right aileron input, " I did not give it input".
About ready to throw away all my electronics and get all new stuff, but I don't have that kind of $ LOL

Empire Hobby Team Gaui USA

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09-20-2013 09:44 PM  5 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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Most likely not a static discharge problem.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-20-2013 09:48 PM  5 years agoPost 3
Einzelganger

rrKey Veteran

Campbell, Texas

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1st I'd check through your T/H settings with a fine tooth comb.
I once had inadvertently set negative pitch setting to T/H so the engine dropped to idle and the bird dropped like a rock. Adrenaline rush for sure.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-20-2013 09:50 PM  5 years agoPost 4
Kauaiguy

rrNovice

Hawaii

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Could you be having a rx brown out?With my Vbar clone I could download a flight log that was showing voltage dropping below 3.3v and causing similar responses ,before that I thought it was static too on my heli.

I'd rather be flying!

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09-20-2013 09:58 PM  5 years agoPost 5
Nasty1

rrApprentice

Enf,Ct-USA

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I check TH, and all the flight modes on the bench. And get no swash plate movement,

My fly bar does not have any downloadable memory.

Brown out unlikely, it's futaba.

Empire Hobby Team Gaui USA

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09-20-2013 10:21 PM  5 years agoPost 6
Rafael23cc

rrKey Veteran

Junction City, KS

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Brown out unlikely, it's futaba.
ALL electronic devices are subject to volage dropout. The fact that he said "brownout" does not imply Spektrum.

Are you completely positive about the volatege adequacy of your system?

On a side note, I'm assuming that this is a Flybarred machine since you do not mention a flybarless controller in your set up. Neither you mention the size and voltage of your flight battery.

Assuming that it is a flybarred machine, have you checked ALL the linkages making sure that they are all secured and tight? I've seen before broken liks and loose link balls that appeared to be fine on visual inspection but it was obviously bad when a little pressure was applied.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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09-21-2013 12:07 AM  5 years agoPost 7
Heli_Splatter

rrElite Veteran

USA

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You could try a test. I suggest hooking up a voltage meter to the battery and dry flying it on the ground for around 5 or 6 minutes. Just work the servos as if you were really flying the aircraft. Have someone monitoring the voltage, after fake flying, switch throttle hold on and see if there is any anomaly. If not keep fake flying for another 5 minutes and try TH again.

I have not seen a static electricity event. You could try another battery, or swap out the receiver. Could be radio too. Things get wierd when batteries are low.

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09-21-2013 12:56 AM  5 years agoPost 8
Einzelganger

rrKey Veteran

Campbell, Texas

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Which Futaba transmitter are you using?

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-21-2013 01:20 AM  5 years agoPost 9
Nasty1

rrApprentice

Enf,Ct-USA

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Transmitter is 14sgh, voltage is 6.6 now, but have flown a good bit with my other models, after, had no issues.
flight pack is Pulse 3600, 7.4 volts, after the last crash, it was 4 volts per cell, the pack does not sit, I fly this machine a ton,
Flight pack is directly connected to the ReactorX,
there is 3 direct connect wires from receiver to the ReactorX, each cyclic servo gets it's own power feed. as the receiver gets 3 power inputs.

I also have a gryphon auto booster lite on it, it was not enabled during the weird activity.

and yes my heli gets sloppy wet from flying, any chances that would short out some electronics,,, anyone have a history of that ?

the elevator and tail servo gets the most from the oily mess.

going to do some artificial flying in the basement tonight,

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09-21-2013 03:01 AM  5 years agoPost 10
Nasty1

rrApprentice

Enf,Ct-USA

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I was testing out the servos with a servo tester, I connected the 2 cell directly to the servos, some survived, one did not, maybe I killed a weak servo, lol, I know these servos were not rated at that high voltage,

with all servos hooked up, and new servo installed, tested out on the bench for about 10 minutes, could not cause anything that looked weird,
during these tests, the flight pack did not drop below 7.4, the pack with no load on it reads 7.6v

any other tests I should try before cleaning up the wires and getting ready for a test flight ?

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09-21-2013 04:21 PM  5 years agoPost 11
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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You could still have a bad cell that is dropping out under load or a bad servo causing the overdrawn situation as well. Connect that pack to a different setup on the bench and check by wiggling the sticks while connected to a volt meter. At least then you will know if it is a bad battery or not. Then she. You replace the servos, do the same test to the old setup with the now proven to be good battery (from the old test) and connect one servo at a time and recheck.....

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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