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HomeMy Site✈️Aircraft🚁HelicopterHelicopter Main Discussion › Electrical/Static grounding - New question
04-04-2013 01:51 PM  6 years ago
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KevinB

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Electrical/Static grounding - New question
Hi everyone.

I recently ran into my first problem with static discharge disrupting things on a heli. It is on an electric 450. The problem appeared to be static charge building in the carbon tailboom and not being able to equalize with the front half of the heli due to a plastic tailboom block. Once I installed a bonding strap from the tailboom to carbon mainframe, the whole airframe now has continuity between it, and the glitches appear to have been cured...at least on the bench.

My question....... even though the airframe (including the motor mount) is now "connected", do people normally ground the negative side of the power supply to the airframe as well like in a real aircraft? Or is airframe continuity sufficient?
Is the grounding of the power system in a real aircraft anything to do with static or is it more about just saving the weight of the extra conductor needed back to a negative power bus if the airframe grounding to the power system wasn't there?

Thanks for any info you can provide,

KevinB
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04-04-2013 01:58 PM  6 years ago
RCHSF

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I read on HF about this. I think they advise against using a ground from the power system to frame.
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04-04-2013 07:49 PM  6 years ago
Ronald Thomas

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Grounding to the motor mount is usually sufficient but sometimes to the (-) lead is needed. The issue with going to the (-) lead is, if something shorts to the frame, there is a DIRECT path to the electronics......they could get fried.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-04-2013 08:04 PM  6 years ago
RogerRabbit62

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Had some issues on older henseleit with a belt also.

I connected - of the accumulator to the chassis ground and every item with a small copper lead to that point (like a star).

No problems since then.

That was before 2.4 Gig
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04-04-2013 10:44 PM  6 years ago
Ronald Thomas

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2.4 is not immune to static, you need to ground it as well. It does not matter what kind of wire you use as long as there is continuity between the rear of the tail box at the rear bearing and the motor mount.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-04-2013 10:52 PM  6 years ago
RCHSF

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Thanks for the confirmation laughingstill on how to go about it. It's always great to have someone who knows what their talking about speak up. I never done any of this yet, so it's new to me also. Is a capacitor necessary? if so where at in the chain? And what size?
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04-04-2013 10:59 PM  6 years ago
Ronald Thomas

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No capacitor is necessary. I will see if I can find some pics and post them of my Logo 600.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-04-2013 11:08 PM  6 years ago
Ronald Thomas

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Here are a few pics

From the rear the boom in the rear, from the boom in the front to the motor mount. Test with a multi meter the make sure you have a great connection.
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-04-2013 11:28 PM  6 years ago
RCHSF

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Thanks for the visual reference.

So tensioner/idler, to boom, then boom to motor mount. Nice and clean.
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04-05-2013 02:26 AM  6 years ago
Ronald Thomas

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Yep, that is it Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-05-2013 04:42 AM  6 years ago
KevinB

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Well, that sounds good. I won't worry about grounding the electrical system unless I run into further issues.

Thanks!

KevinB
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04-05-2013 04:55 AM  6 years ago
bricktop

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This is only an issue with belt drive?I didn't say you did it...I said I was blaming you.
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04-05-2013 08:18 PM  6 years ago
RCHSF

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Prob so, only bets. Because the way they travel, and roll over pulleys in the boom. A rotating shaft prob does not create much discharge.
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04-05-2013 08:49 PM  6 years ago
Ronald Thomas

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Only belts, they create a static charge when they run through a boom and over pulleys.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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06-22-2013 07:07 PM  6 years ago
KevinB

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thanks for posting the pics laughingstill. I have a question though....for anyone really....

I can totally appreciate the grounding of a carbon framed/aluminum part heli so that all parts are connected. Where you are bonding over a plastic part like a boom block that there is a relatively small gap a static charge needs to jump.

On the Logo 550sx, how does it benefit you? Perhaps the grounding of the belt follower bearing to the boom so there is no potential difference between the belt and boom. But what does connecting the boom to the motor block do for you? There is a lot of plastic between those two parts! And besides, the motor block doesn't have continuity with the electronic ground anyway.

Please explain how the bonding straps do anything useful with all the plastic involved ?

Thanks!

KevinB
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06-22-2013 07:12 PM  6 years ago
Ronald Thomas

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That static build up will discharge anywhere so electronics on the Heli are all succeptable. The motor plate is a good source of a ground path for the charge to dissipate and not harm surrounding electronics. There is a clear path to travel. You are not eliminating the static, just giving it a very clear path to go.
The plastic does not give enough distance or shelter from the static hit so grounding on Belt tail driven Logos is very necessary.
Hope this helps....Ron
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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06-22-2013 07:47 PM  6 years ago
BobOD

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What you are doing is reducing the potential static buildup between the boom and the electronics. The motor case is insulated from the windings (should be anyway ) but the insulation is quite thin. So, the charge will jump through this insulation well before it could jump a much longer distance (boom to a wire for instance).
So, you eliminate a potential static buildup that could arc to your electronics.
Team POP Secret
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06-22-2013 10:53 PM  6 years ago
KevinB

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OOOOOK

I now have continuity from the idler bearing on the tail to the motor mount.

Thanks for the feedback!

KevinB
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06-22-2013 11:23 PM  6 years ago
BobOD

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And, some people find that the smaller discharges into the motor windings still cause problems and find it necessary to ground to the negative battery lead. Then the static buildup is eliminated entirely.Team POP Secret
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06-23-2013 12:16 AM  6 years ago
Ronald Thomas

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And provide a clear path to the electronics for a short to destroy them. Only do that is the previous does not work.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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