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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Severe interference during start up
08-14-2021 03:31 AM  38 days ago
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honda411

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Surprise, AZ USA

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Severe interference during start up
Hello all, so my bird is a Gaui nx7 with align servos ds820 and 825 servos, I forget the regulator brand, Ys96srx, push glow, ikon 2, futaba sbus rx with futaba 8fgh radio.
So here is the scoop. I went flying yesterday, was in a backwards high speed inverted hurricane, and the engine shut down in an instant. Similar to it seizing up. Not the normal like it just bugged out and rpms come down. No this was instant! I figured the engine seized. So I took it back, glow plug lit and fired right up. No interference at all and nothing abnormal. I figured okay it was odd. Spooled it up on the ground to idle up 1 and it bounced a few times a very little and immediately shut the engine off again. I said okay I’m done and figured it was a failsafe.
Played around today on the bench and nothing abnormal happened. Updated the firmware in the ikon 2 and adjust a few gyro gains that needed to be done anyways.
I went out today to see if anything changed. I could not even start it and you will see in the video links provided as to why. Any time I went to start it, severe interference occurred, throttle servos jumped around and so did everything else. It seemed to get worse very very fast. I looked over wires today from what I could see visibly and nothing was noted bare. Glow plug on or off it acted up.
First video is of trying to start it without glow plug on because it was jumping the throttle servo open and closed.
Second video is of the battery still connected but radio system off. Moving the servos, it makes power. I believe this was normal and always did this since new. So I don’t think it’s that.

I also unplugged the gov or gov sensor wire to see if that caused any changes. Nothing changed and still got interference.

This issues never ever came up and all of a sudden it’s severe. Never encountered anything like this on this model or in my entire 12 plus years in this hobby. I don’t see anything touching the clutch bell or anything close to it. Photos are also provided to see setup. Just note I did not glue my rx casing because it’s broke. I only do that to help keep oils out.

Also, I looked at the ikon led status lights and rx led light and no changes noted during interference.

Watch at YouTube

Watch at YouTube

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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08-14-2021 05:12 AM  37 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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I suppose you run a tubing to protect each antenna from CF frame... But you don't.
Very bad arrangement on the antennas... Don't do that.

So, The primary suspect IMHO, it is the regulator.

Failsafe is activating because low voltage is coming from regulator to Rx... Why?

High amps on servos!
Check servos ATV to see if it is not stressing push rods.

Lipo batt in very bad conditions.

CF frame do a tiny cut on a cable servo and cause electric interference.

Bad regulator.
Don't flight with this regulator... Change it and run a ferrite ring on output cable to Rx.

Do all the range test on the ground prior to flight...

/
Saludos cordiales,
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08-14-2021 07:15 AM  37 days ago
honda411

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Rojo I’d agree maybe the antennas are not adequate in arrangement and protection. No argument here at all, but I have run this way for quite a long time with no issues. Not saying to keep it that way and will change it. But this setup has not changed at all and have never had any issues with any of the arrangements.
Could the failsafe be activating? Sure possibly. But for it to also reinitialize so quick? I mean fractions of a second. I have also tried two different lipo batteries and same issues. The regulator doesn’t show a low voltage beep or warning like it has during low batteries on other times.
I’m just unsure. Like said, this setup and positioning has been like this for a long time and no issues. Same with ex antennas. Who knows. You may be right for sure and I appreciate your feedback and input. Just very very odd ONLY when the starter is activated.
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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08-14-2021 12:51 PM  37 days ago
Rojoalfa

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That is why I suspected of bad or faulty regulator.

Cables from servos... Be careful with CF frame because it will work like a knife.
CF frame works as a electric conductor.

The other thing you need to isolate is the glow plug starter onboard. This little daemon consumes for a very short time up to 2 or 3 amps.
Don't connect this little deamon from the regulator.
With this gadget it is always better to connect directly from batteries.

I think that your starter motor needs maintenance but that is not a big issue.

Try with another regulator.

/
Saludos cordiales,
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08-14-2021 07:45 PM  37 days ago
honda411

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Hi Rojo, yeah the on board push glo is isolated to one rx output channel. Never did have an issue before with this. And during the videos, the glow wasn’t lit because I didn’t want an accidental full throttle start.
It’s just really hard to imagine it’s the regulator all of a sudden and no interference from it until the crankshaft is spun on the engine. Just really odd.
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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08-14-2021 08:51 PM  37 days ago
Rojoalfa

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In some weird cases, faulty bearing can cause electromagnetic interferences....

But it is something ferrite rings can handle.

I can see a lot of cables between ikon and other gadget... Regulator

In some particular cases, if you make cable loops, this loops acts as an antennas... Causing electromagnetic interferences...

I would rearrange also this "spaghetti cables" you have there, running as straight as I can.

/
Saludos cordiales,
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08-14-2021 09:01 PM  37 days ago
honda411

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Surprise, AZ USA

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Interesting you say the bearings can cause it also. I think the one way bearing has started to slip here and there. Probably more so on the main gear. But maybe something is wrong with the bearing.
I’ll redo the wire chaos also. I’m sure I need to rip it all down anyways.
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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08-15-2021 06:28 AM  36 days ago
oldfart

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Vancouver, Canada

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Check the bearings that support the clutch bell. If they go bad enough to bind, they will cause your motor to stop abruptly in the air. They will also cause some bad radio problems.Phil
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08-15-2021 12:48 PM  36 days ago
balsabasher

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Central Ohio, USA

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Are you using the HD version of the Ikon2? Is the FBL controller resetting/restarting during the time the servos are jumping?
Try testing with a battery (with the proper voltage for your servos) hooked directly to the FBL controller. No regulator or old on/off switch between the battery and controller.
Check the mounting tape between the controller and heli.
Blades; what goes around, comes around!
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08-15-2021 03:09 PM  36 days ago
honda411

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Surprise, AZ USA

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Thank you old fart. I will have to pull the engine some time when I can and look. I’m sure they are worn.

Balsabasher,
It’s the standard size ikon 2. The controller does not reset during this issues. The status lights remain the same and same with the receiver.
I think like you said, the next thing is minus out the regulator altogether and test the same thing with battery straight to the fbl unit.

Thank you all for your responses already!
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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