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E-Sky › Another dying AR6100?
02-08-2008 05:46 PM  10 years agoPost 1
rccarguy

rrVeteran

Boston MA

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So I was out in the backyard flying the HBK2 the other day and the motor quit for a split second mid-flight then recovered. Happened once or twice more on that pack, and again on the next flight.

Checked all the connections, everything looked good, so I swapped the ESC for another and removed the BEC to see if maybe one of those was responsible. Just went out back for a test flight and it did it again after a couple minutes in flight.

Only seems to happen when I'm loading the motor like in a banking turn or a hard climb out. Had this happen before on another 300 series, only a bit more severe, that one would just drop out of the sky without recovering. In that case it turned out to be a bad AR 6100 rx causing the problem, the HBK2 is using the replacement.

Since I just swapped out the ESC and the BEC is disconnected, I'm thinking that this RX may be dying too. I've never had a brushless motor quit, but is it possible the HDX300 motor could be going flaky?

I've got another HDX300 sitting around, don't have another spare AR 6100 to try, the Trex and Raptor both have AR 7000 rx's. I really don't like the shotgun approach of just swapping stuff until the problem goes away, but process of elimination will probably be the only way to figure this one out

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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02-08-2008 06:04 PM  10 years agoPost 2
shizack

rrKey Veteran

Aiken, SC USA

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Sounds like an intermittent/loose electrical connection. Spektrum DSM1 RX's take about 1 - 3 seconds to regain contact with the TX when power or signal is lost. That's why it was unrecoverable before. If the RX was cutting out again it would be dirt nap time for the heli.

I'd check and maybe resolder the motor connectors. You've swapped ESC's, so that probably isn't it. Even if the motor terminals seem solid, the wires may have wallowed themselves out a little cavern inside the solder joint.

If that's OK, look for loose wires or floppy connections elsewhere. There may be a loose pin in the RX ESC connection.

A soul in tension is learning to fly

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02-08-2008 06:22 PM  10 years agoPost 3
slider46

rrProfessor

Ocala Florida

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There is an issue with the dx radios and low voltage, Alot of the 3D guys have had problems. It's usually the bec doesn't provide enough power when there is a big draw on the packs... Many guys have gone to seperate bec to fix the problem...
May be your batteries are not big enough to handle the voltage drop for hard flying too....

Tom..... No "D" flying....

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02-08-2008 07:51 PM  10 years agoPost 4
Sgt Heli

rrVeteran

Remlap, Al USA

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Another good reason to shore up your elec. system with a separate BEC I'm thinkin. A good spare BEC is $20 or so.

On the 6100, I'm sure you know that it needs to be version 1.2 and NOT version 1.0

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02-09-2008 12:36 AM  10 years agoPost 5
Gregor99

rrElite Veteran

Western Wa

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The voltage range of the A6100 is 3.5v - 9.6v. So the BEC would have to be pretty disfunctional to run that low. Even if you battery voltage dropped to below 3v per cell or 9v (doubtful) the BEC should still be able to deliver at least 3.5v to the radio.

Dispite that, there are many unexplained and unverified reports of AR6100 Rx appearently powering down and back up again mid flight. Low voltage is usally blamed but can never be verified. I'm not saying I think the claims are true, or false for that matter. Just mentioning there are a lot of reports and almost none of them have factual data to back up what took place. Again, its not a denial as it would be hard to collect data unless you've got a data logger on board.

I'll close by saying that though I've never had a problem with my AR6100, I'd wish that I'd gotten the AR6200 and leave it at that.

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02-09-2008 01:29 AM  10 years agoPost 6
slider46

rrProfessor

Ocala Florida

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I have 1 6100 and 3 7000 recievers and they all work great but I don't "D" fly like the guys that are having issues I think the rx needs higher power than it gets is the way I read it and drops out....

A data logger would help gathering the correct info to find the problem....

Tom..... No "D" flying....

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02-09-2008 02:08 AM  10 years agoPost 7
rccarguy

rrVeteran

Boston MA

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And the winner is....
...shizack!
I'd check and maybe resolder the motor connectors.
A picture is worth a thousand words as they say...

Problem found, problem solved

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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02-09-2008 02:13 AM  10 years agoPost 8
slider46

rrProfessor

Ocala Florida

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Wow that could be a problem.... Glad you found it and fixed it.....

Tom..... No "D" flying....

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02-09-2008 02:16 AM  10 years agoPost 9
rccarguy

rrVeteran

Boston MA

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Me too. Connection looked fine until I grabbed the end and tugged on it a little, POP, connector slides right out of the shrink wrap with no resistance at all.

Not surprising it would lose power when banking or climbing out

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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02-09-2008 03:01 AM  10 years agoPost 10
slider46

rrProfessor

Ocala Florida

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The up side is it's an easy fix and you back flying .... got to feel good about that...

Tom..... No "D" flying....

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02-09-2008 03:29 AM  10 years agoPost 11
tryan02

rrProfessor

Canton, Missouri

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Just a suggestion good solder joints don't come apart. I would heat up and resolder the other two just for safety sake.

You may already know this but here goes anyway.

Turn the iron up to 700 use a chisel tip fill the cup with molten solder and hold pretinned wire in cup till its solid.

But what do I know Im overdue for my solder re-certification.

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02-09-2008 02:02 PM  10 years agoPost 12
rccarguy

rrVeteran

Boston MA

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Just a suggestion good solder joints don't come apart. I would heat up and resolder the other two just for safety sake.
I'm going to take it one step further and replace all three connectors. If I remember correctly, these connectors were already on the wires when I bought the motor. The one that let go looks like a cold solder joint, so now I don't trust the other two, and I'd like a better quality connector, so...

For now I'm flying on the backup motor with 9 tooth pinion until I can get to the LHS for spare connectors. I'm curious to see what if any difference 9 tooth makes vs. 10 tooth.

Spooled it up in the house last night after reinstalling the original ESC and separate BEC with all new connections and it seems good to go. Should be able to get at least one test flight in outside today before the weather turns to crap.

Thanks to everyone for the helpful suggestions

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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