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Old 03-08-2015, 03:14 AM   #1 (permalink)
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Default G380 static properties?

2 of the g380 owners in finland have blackouts with their helis.

One possible cause is static buildup in the tail.

What parts are designed to be conductive?

Does someone else have problems?

I have not yet started to build my own but maybe today.
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Old 03-08-2015, 09:51 PM   #2 (permalink)
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Can you be more specific? I.E brown out of the bec? just the motor? FBL brownout? Reception?
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Old 03-09-2015, 12:59 AM   #3 (permalink)
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My G380 crashed last weekend due to a suspected static hit (another one of the crashes in Finland Tohtori R referred to).

My setup is:

MSH Brain
MKS DS95 servos
MKS HV9780 Tail servo
YGE 90LV esc
X-Nova 2820 motor

It was my fourth flight with the machine. All electronics are brand new.

About 3 minutes in to the flight, Tail suddenly twitched and then let go all together. I lost power and all controls for a second or so, and the Goblin fell to the ground.

When picked it up, esc was beeping 5 times "Receiver signal failed".

My flying buddy had this exact same episode one week earlier with his G380. He has v-bar, Savox servos, YGE90LV and Scorpion motor. Same in-air clitch and 5 beeps from the YGE after picking up the machine from the ground.

First we suspected a problem with YGE bec. Both YGEs are brand new V2s. My friends V-bar log shows a warmstart rather than any low voltage warnings. That made us suspect static strikes.
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Old 03-09-2015, 01:10 AM   #4 (permalink)
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unlike the other Goblins , my G380 has no conductivity from the tail block to the main frame , don't say its a problem as not heard anybody hit by ESD , but I have sprayed my tail belt with silicon spray just in case
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Old 03-09-2015, 01:21 AM   #5 (permalink)
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that I did with my G500 as I lost conductivity and suffered ESD

https://www.helifreak.com/showpost.p...3&postcount=54
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Old 03-09-2015, 01:28 AM   #6 (permalink)
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Quote:
Originally Posted by robertvizzo View Post
Can you be more specific? I.E brown out of the bec? just the motor? FBL brownout? Reception?
I have not seen those cases myself and i am not intrested about them. But if i get them right they had total blackouts (and crash). One has v-bar and that log has no signs for low voltage so static is a good possibility.

I also noticed from my own g380 that there is no conductivity from tail to frame. Tailpipe itself is carbon (conductive) but its fittings from both ends is blocking connection.

I think that can be corrected with no extra parts by removing some paint from tailpipe surfaces.

Static is bigger problem in dry cold air just like in finland sometimes
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Old 03-09-2015, 02:02 AM   #7 (permalink)
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My G380 crashed last weekend due to a suspected static hit (another one of the crashes in Finland Tohtori R referred to).

My setup is:

MSH Brain
MKS DS95 servos
MKS HV9780 Tail servo
YGE 90LV esc
X-Nova 2820 motor

It was my fourth flight with the machine. All electronics are brand new.

About 3 minutes in to the flight, Tail suddenly twitched and then let go all together. I lost power and all controls for a second or so, and the Goblin fell to the ground.

When picked it up, YGE was beeping 5 times "Receiver signal failed".

My flying buddy had this exact same episode one week earlier with his G380. He has v-bar, Savox servos, YGE90LV and Scorpion motor. Same in-air clitch and 5 beeps from the YGE after picking up the machine from the ground.

First we suspected a problem with YGE bec. Both YGEs are brand new V2s. My friends V-bar log shows a warmstart rather than any low voltage warnings. That made us suspect static strikes.
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Old 03-09-2015, 08:49 AM   #8 (permalink)
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okay i made the corrective actions

all you need to get it conductive is dremel tool.

you need to grind paint and coating from 3 places.

-from the tailfin around that bolt. (tailtube side)
-rear of the tailtube around the same bolthole
-front of the tailtube around that nylon bolt.

that side in front of the tube was just experiment that did not make it to work.

be careful not to remove any carbon fiber as the tube is allready very thin. just gring conductive carbon to the surface and measure that it is conductive before move to next step.

i now have under 10 ohms between that aluminium masterpiece and tailshaft

so very easy task and it takes only few minutes. i just wonder how sab has not done this.





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Last edited by Tohtori R; 03-09-2015 at 09:52 AM..
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Old 03-09-2015, 08:51 AM   #9 (permalink)
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Where are you guys placing your receivers or satellites.

If the sat is on the boom then it could easily be affected by a static hit.

I'm moving mine to the lower rear frames like on my bigger goblins with one antenna on each pointing into the air and orientated 90 deg apart...

With my botched maiden and current disassembly this is much easier now.

In hind sight all electronics should be installed and completed before installing the tail boom...

I tried for a good period of time to get continuity from the tail to the frame but there does not appear to be enough carbon exposed.

I even sanded the boom where it inserts under the main plate and could not continuity through the boom.

Being in a very dry area this gives me some concern.

I may need to run a wire from the tail case to the frame just to be sure.

Any belted heli needs to show connectivity between the tail case and the motor mounts or main frame.
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Old 03-09-2015, 05:30 PM   #10 (permalink)
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this is my quick fix , removed the screw that pin down the nylon screw , took a needle and scraped away the paint and voila conductivity

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Goblin 380 conductivity (1 min 28 sec)
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Old 01-17-2016, 01:33 PM   #11 (permalink)
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Hi guys,

Glad to hear that I'm not the only one with that issue ;-)

Im from Switzerland and it happened on a beautiful but cold and dry winter day. I assume the weather conditions really matter because I never had any issues before (20-30 flights). Luckily the crash was not too bad -

The vbar logs showed:
- ".."
- "No input from rx"
- "Activate failsave"

No doubt a static hit because:
1. I had no conductivity from the tail <-> motor
2. Mounted my spectrum sat on the boom

Thanks for the "dremel" hint. It helped me to get conductivity from the tail all along to the motor.

No problems so far, fingers crossed ;-)

cheers, CÚdric
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Old 01-18-2016, 03:38 AM   #12 (permalink)
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Is this a specific spectrum sat issue perhaps?

Any reports of static hits with any other receivers?

Was the vbar log a vbar sat setup or spectrum?
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Old 01-18-2016, 04:30 AM   #13 (permalink)
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Maybe. My setup is vbar neo with 1 spectrum dsmx sat (mounted on the boom). cheers CÚdric
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Old 01-18-2016, 01:05 PM   #14 (permalink)
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I would def use two sats
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Old 01-19-2016, 02:27 AM   #15 (permalink)
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Quote:
Originally Posted by cederigo View Post
Maybe. My setup is vbar neo with 1 spectrum dsmx sat (mounted on the boom). cheers CÚdric

Don't mount the sat on the boom - I've found out the hard way:
https://www.helifreak.com/showthread.php?t=725387

The sat on the boom acts as an antenna and draws in static from the boom. I've been advised by the FBL developer to place the sat and al cables as far away from the boom as possible to avoid static hits to the sat cabling..
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Old 01-19-2016, 03:57 AM   #16 (permalink)
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All the pics I have seen, and including the way I run my v link wires show the antenna wires running down past the boom, and there have not been vlink static hits reported that I know of.

https://www.helifreak.com/showpost.p...3&postcount=15

Any futaba sbus issues with antenna running along the boom?

https://www.helifreak.com/showpost.p...96&postcount=7

https://www.helifreak.com/showpost.p...20&postcount=8


https://www.helifreak.com/showpost.p...15&postcount=1


There are so many loss of signal issues with spectrum sats, it scared me away from using them. If you go spectrum use a full size receiver if possible. Just my opinion.

https://www.helifreak.com/showthread...01#post6823001

Last edited by Pard; 01-19-2016 at 07:50 AM..
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Old 01-20-2016, 09:21 AM   #17 (permalink)
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It's wild I see all these changes, modifications... and yet on my CE I have 100 flights, - had a servo issue nothing I control..

My yellow 75 flights.. 0 issues... never one in flying, brown outs.. nothing. 0 issues other then a wobble which was a servo issue.

Just wild.
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Old 01-20-2016, 09:29 AM   #18 (permalink)
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Yeah odd 200 or so flights on the both of mine and no issues. I swear mine have conductivity from the tail to the motor block with no mods. I'll have to recheck. I also do not lube my belts and have been flying a lot in the cold dry winter weather. both of my 380's are wired like this.

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Old 01-20-2016, 05:36 PM   #19 (permalink)
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.

This is what I did with my vlink.



.
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Old 01-24-2016, 09:49 AM   #20 (permalink)
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well this was the 3rd time I lost control , the heli went into a backwards loop the last two times ,I cant recall if I was starting to pull that maneuver at the time . but the motor still had power . I had to hit throttle hold each time . the satellites where solid red when I picked it up.
I have a robird fbl with 2 sats , 1 a lemon and the other a dsmx . both of them are mounted an inch above the rear skids on opposite sides . and im using a hobby king yep 60 amp esc with the alzrc 1000 kv motor , kst 215 servos / 515 kst tail .
one of the cyclic servos (pitch) is immovable by hand , which is often the case after a gear replacement but works fine when under power.
I have tried doing the mod posted by tohtori , grinding off the paint at the tail fin /boom , and under the front bolt area . but these areas won't make contact since they have a " indentation" , they are below flush .
so if it is a static problem im not sure that is helping . maybe some washers placed in those spots to make contact . I will try running a wire from the tail to the motor to see if that helps .
but this is getting old , im beating the crap out of a beautiful , previously flawless canopy for naught . .
so what do you guys think ? if I give it a couple of whacks with a hammer , will that fix it ? or should I try something else ?


edit , the dmsx sat thats mounted , needed both antennas replaced , which I resolderd , im wondering if something could be shorting out , ill try switching that one out .
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