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HelicopterMain Discussion › Damaged capacitors on ESC?
06-16-2015 06:15 AM  35 months agoPost 1
ZS-JAF

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Houston, TX

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I have an ESC with the capacitors are bent and the dented. The ESC seems to work fine on the bench. What is inside and what could this damage do?

I have a 3D heli, I don't understand why it doesn't do 3D

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06-16-2015 07:34 AM  35 months agoPost 2
EEngineer

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TX

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Who knows?

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06-16-2015 01:18 PM  35 months agoPost 3
dkshema

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Cedar Rapids, IA

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What is inside? Foil, paper, and an electrolyte.

http://www.capacitorguide.com/electrolytic-capacitor/

What will dents do? Perhaps no real effect, perhaps reduced capacitance (which may lead to ESC failure down the road due to excessive ripple current), perhaps one or both connections of the foil to the terminal pins are broken, or the capacitor may develop an internal short. Since the cap is placed directly across your battery, a shorted aluminum electrolytic cap can have a spectacular failure mode. They explode. Generally the can separates from the end seal and that little roll of foil/paper and vaporized electrolyte shoot out like a fire cracker.

It really depends on just how bad those dents are.

-----
Dave

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

Team Heliproz

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06-16-2015 04:32 PM  35 months agoPost 4
ZS-JAF

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Houston, TX

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Well ok then. That is what I was asking thanks for the details. I would not fly this on a heli. It is on a plane. This ESC was brand new when it went in. The only other option I have is to use a second ESC which is much heavier and also has small dents in it. If you were a gambling man do you think it is more likely to fail or work without issue?

I have a 3D heli, I don't understand why it doesn't do 3D

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06-16-2015 05:14 PM  35 months agoPost 5
Aaron29

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USA

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So firecrackers are no go on a heli but a go on a plank. Love it. If the thing grenades please get video!

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06-16-2015 05:17 PM  35 months agoPost 6
GyroFreak

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Orlando Florida ...28N 81W

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Replace the caps if you are skilled at soldering.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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06-16-2015 05:44 PM  35 months agoPost 7
RM3

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Killeen, Texas - USA

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a good sized dent or a lead that has been pulled out a tiny bit in an electrolytic capacitor can effect the voltage rating and also cause the electrolyte inside to be "thinner" between the foil and can cause a hot spot.

Now what do you think happens to a capacitor when it shorts out in an ESC that is also hooked up to a high capacity high discharge rate Lipo that has no fuse between them?

flying damaged electronics related to primary power sources is a risk I would not take,
but if you thinks its OK, keep a video log and a fire extinguisher on hand and report back.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-16-2015 05:46 PM  35 months agoPost 8
Aaron29

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USA

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It's a plank. Go for it. But keep the GoPro pointed at it. LOL.

But in all seriousness, can you send it in for service?

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06-16-2015 06:50 PM  35 months agoPost 9
Heli_Splatter

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USA

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Better to find someone local with a bit of electronics experience. It is a simple matter to swap caps. Who knows what they charge at the manuf to replace.

Unless it is high dollar name brand ESC, it might be cheaper to throw away and buy a new one.

You could run it on the bench for a while to test. If I were flying it, I would have separate power system for the radio and servos.

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06-16-2015 08:03 PM  35 months agoPost 10
ZS-JAF

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Houston, TX

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Good stuff guys. As usual there is more to the story on this ESC. I finally decided to go to the dark side with this plane due to peer pressure at the field. The plane is a hotliner. I pay for the plane to be built $1000 total in this thing. My friend a great plank pilot helps with the maiden. The only problem is in the high speed mode with the flaps and ailerons negative for speed dives/passes it snaps when it gets slow and stalls. We then set up the buddy function on the DX9. This was a first for both of us. When you touch the sticks on the DX9 "Master" it takes control from the slave instantly. We the do a second flight/last buddy box flight. I am feeling comfortable with the hand launch and landings. As the plane flies past his phone rings, he turns away from the plane and answers. As he does this he bumps the DX9 stick, I am locked out and crash. The plane is in pretty go shape except for the Jeti Spin 66 ESC and the wing spare. I am ready to put in the towel with this plane crap. He says he will take it home and fix it, which he does. Take two the plane is fixed with a second new ESC. I take it flying and it is going well. Second flight, I loop it low to the ground, It stalls at the bottom of the loop and snap rolls 5' off the ground. To my surprise this plan is still intact. I just need to replace the motor. This is where the second ESC got damaged. It still works so I am going to run a whole pack though it on the bench and if it work great. If the whole thing goes up in smoke, I was not meant to fly this plane.

I thought of soldering the caps but where do you get replacements? The second ESC I could use also with slightly dented packs is a YGE 120. Both are expensive so if they work I don't want to trash.

I have a 3D heli, I don't understand why it doesn't do 3D

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06-16-2015 09:03 PM  35 months agoPost 11
ZS-JAF

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Houston, TX

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6 Minutes on a heli motor no load, with the bec powering and moving all the servos. Nothing feels hot or seems out of the norm. I am sure that it has reduced the life of the ESC but they all will fail at some point right?

I have a 3D heli, I don't understand why it doesn't do 3D

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06-16-2015 10:49 PM  35 months agoPost 12
salrica

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Raleigh,NC

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You are a gambler, already said that.
Most people are suggesting NOT to use it, but you still pushing otherwise.
Just DO what is best for you.
Have a buddy with the gopro and post the video, please.

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06-16-2015 11:30 PM  35 months agoPost 13
GyroFreak

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Orlando Florida ...28N 81W

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I thought of soldering the caps but where do you get replacements?
Mail order, Jameco.com, Digikey.com, MPJA.com, just to name a few
Get low ESR types.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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06-17-2015 01:05 AM  35 months agoPost 14
dkshema

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Cedar Rapids, IA

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http://www.digikey.com or http://www.mouser.com

Two excellent sources of quality electronic components. Low ESR aluminum electrolytic capacitors of the kind you're looking for are relatively easy to source, and to replace.

I've replaced damaged caps on a few ESCs, not a problem.

-----
Dave

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

Team Heliproz

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06-17-2015 01:46 AM  35 months agoPost 15
EEngineer

rrProfessor

TX

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I loop it low to the ground, It stalls at the bottom of the loop and snap rolls 5' off the ground.
Besides the ESC, you have other major issues.

How high is the wing loading?

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06-17-2015 03:06 AM  35 months agoPost 16
nocontrol1

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Melbourne, FL, USA

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Besides the ESC, you have other major issues.
Agreed. Planks can be a lot of fun too, having diverse interests should be applauded. But buddy-boxing on a hot-liner? Usually by the time someone is messing with those they have already developed the skills to fly with out needing a buddy box. I'd recommend getting a more suitable plank to do the learning on and save the hot-liner until you have the necessary skills. A sim is good too if you don't have one already. If you have a passion for it, it won't take long before you would be ready for the hot-liner!

Rob D.

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06-17-2015 04:24 AM  35 months agoPost 17
EEngineer

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TX

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Agreed.
High wing loading combined with a CG that's too far aft is a recipe for disaster....and will become evident in an inside loop at the bottom.

A classic example....fortunately the damage seems minor...

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06-17-2015 02:44 PM  35 months agoPost 18
kingmeow

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The Garden State, US

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If this is your first venture into planks I would avoid a hot liner on a buddy box! I would start with a Cub and fly it 3 mistakes high for starters.

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06-17-2015 02:46 PM  35 months agoPost 19
ZS-JAF

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Houston, TX

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Thanks for the info on the new capacitors, I will look into those. It is a highly loaded wing and I think the battery might have shifted. We were using the buddy box since we had the future and this was my third flight on a plank ever. Flying helis helped. I inverted patterns not a problem. I am going to use this plane a trainer. I just received my X-Plane in the mail yesterday for fathers day. That plane is making me nervous. I have been flying the Funjet on the sim with the thrust to weight maxed out.

I have a 3D heli, I don't understand why it doesn't do 3D

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06-17-2015 03:06 PM  35 months agoPost 20
ZS-JAF

rrVeteran

Houston, TX

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I am having issues finding the units I need.

The YGE is labeled T1250 105C PET and 25v 330uf ZLG
The spin is labeled T1117 105C and 25v 470uf

The YGE capacitor has a tab on each circuit board. One side would be easy to get to the other looks like you have to split the two in half. Does capacitor replacement require complete disassembly?

I have a 3D heli, I don't understand why it doesn't do 3D

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HelicopterMain Discussion › Damaged capacitors on ESC?
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