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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › ESC/Motor Nightmare -- Help
05-21-2007 09:28 PM  13 years ago
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LaptopZZ

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Greenwood, IN / Austin, TX

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ESC/Motor Nightmare -- Help
So I seem to have some sort of bizarre issue. I have had my rex for about a year or so... and I had noticed my power wasn't all that strong anymore, just assumed it was my lipos showing their age...

So a couple days ago I'm doing just some hovering flying about and I fall out of the air. The red power cable had come unsoldered from my ESC. It was about 82 so I just presumed it was getting hot. I fix it and plug it in... motor doesn't chime. Dead ESC, but the BEC still works.

I buy a new ESC. Same one. Eflight 40Amp. I use TP2100 gen2 batteries. I have an Align 430L motor.

I get it all setup and test it out. Feels good. Nice and powerful like it used to be way back. I do some hovers and some circles in my yard, all is well.

Today, I go to a local school with a big yard to go play. I do some circles, check out my idle up and do a couple pops off the ground. Just making sure all is well... and then new ESC catches on fire.

Thankfully, nothing died other than ESC and a little char mark on the the motor. Battery is also fine... and not puffed or upset that I can tell.

My thoughts are that my motor is messed up... How can I verify this other than the fact that I've blown through two ESCs?

Regards.
~Matt
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05-21-2007 10:33 PM  13 years ago
airboss

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OC ,california

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motor
sounds like the motor or something causing drag on rotating assembly,bearing,bushing,too tight gear mesh.
Urukay HPS3 KSE 700 HPS3
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05-21-2007 11:15 PM  13 years ago
Boidman (RIP)

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The Home Stretch

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You have one of those dealiwops that are hard to call through the computer. The pinion-end bearing on these motors takes a lot of abuse, through impresive RPM's and side load (even with ideal mesh). The only check I know of for the bearing is to try and move the shaft side to side. There should be no, or extremely little slop.

All I can really offer with regards to the bearing is that on all new motors, I dab a pinpoint of thin CyA on the joint between the shaft and inner race to ensure no slip. If you aren't careful and sure-handed, that can be risky. I use a needle oiler to apply a tiny drop of lube to all new motor top bearings, and again every 10 or so flights. Those oilers can be found in many hobby shops, particularly ones that cater to cars.

If you want and get one, and it doesn't have a bent tip, you can stick a strand of wire from something you have laying around, in the bore before bending.

When you come up with a resolution, I think we would all benefit from the specifics. Good luck.
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05-21-2007 11:24 PM  13 years ago
LaptopZZ

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Greenwood, IN / Austin, TX

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Boidman,
You have one of those dealiwops that are hard to call through the computer
What are you referring to here?

Also...

Are you referring to the bearings that go into the things in the 2nd row first two of this..

If so I replaced them literally 3 flights ago because they didn't feel good to me (top and bottom).
~Matt
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05-21-2007 11:56 PM  13 years ago
Boidman (RIP)

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The Home Stretch

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"What are you referring to here?"

I was trying to refer to problem solving your issue online rather then in person, but obviously wasn't clear. Sorry 'bout that.

My primary point was intended to be about the top bearing on the motor - missed clarity again. I believe there is at least a small chance that your problem might be there.

I once destroyed 2 new Align bearings purposely to give them a thorough eyeball, and also to check the factory lube. One seemed almost bone dry, and the other had less grease(?) than expected.

My choice with every build, is to add oil to each bearing by tilting the helicopter into several positions as a smidge is dropped on each location. To decrease the potential for dust to make a bearing grinding paste, a cotton swab dipped in alcohol is used to clean up any external residue.

I've been around the world 12 times, have money in all 4 pockets, and friends and business all over town, (lies) but I am still frugal. I believe these bearings deserve better care than many give them.
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05-22-2007 06:25 PM  13 years ago
NewRCHeliPilot

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Panama City, Fl.

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Boidman
Help me out here on bearing care. I was told many years ago not to put oil on bearings because it will brake down the grease packed in them. And how often should the bearing be replaced, the ones in my heli are about a year old and still feel smooth but who know how long they'll last. Thanks

Sorry LaptopZZ don't mean to steal you're thread.

.
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05-22-2007 06:29 PM  13 years ago
LaptopZZ

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Greenwood, IN / Austin, TX

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Your question falls into the motor nightmare category. It's all about solving problems right?~Matt
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05-23-2007 12:18 AM  13 years ago
TomRex

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West Palm Beach Join Date: 12-28-2005

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Oil them and they will last!
I have a little oil bottle like in Boids pic. Every time I clean the heli I use Q-tips and alchohol to get the junk out of the crevices and off the head parts, frame. Then I'll get the oil bottle and lube all the bearings including the swash bearing and pack away. Every so often the belt gets some silicone, but the tail box/shaft/slider/links get cleaned and lubed regularly. Things work better and last longer that way. Oil is the stuff that keeps the world running!

PS: a drop on the motor bearings won't hurt a bit!
Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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05-24-2007 10:20 PM  13 years ago
Boidman (RIP)

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The Home Stretch

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As a rule, yes, oil should never be used on a greased bearing. In heavier duty applications, grease will sometimes begin to dry out and can be revitalized before full maintenance by adding oil, if normal greasing methods are not possible.

In a perfect world, one/I would pull all the bearings on a new bird, and fill or refill them with a cone type greaser, if one was available that fit down to the smaller sized bearings. Some folks will pry off a bearing's side plate so that it can be packed by hand, and then flatten the bent plate before wedging it back on.

Fingers with enough experience can tell when there is any kind of lube in even very small bearings, but they have to be removed from the helicopter first. I have finger diddled quite a few 450's parts and pieces and have been less than tickled with how more than just a few bearings felt, brand spankin' new.

After what I saw in the 2 bearings I once disassembled, and what I have felt, seen, and read about problems, adding oil to the tiny crack where the side plates run close to the outer race is the best/easiest solution for good bearing life.

I believe there are too many variables to make a good call on giving an average frequency that these bearings should be replaced. TomRex, I, and many others who oil their bearings regularly have cheaper to operate helicopters in the long run, then the average abusers.

Just in case it isn't known to some, dry or drying out bearings have been identified without a doubt as the cause of glitching problems in more than a few birds. Metal on metal at assorted RPM's can generate unusual disturbances in the RF and electrical force.

I'll lay it out like this, I consider it foolish to not oil the bearings on T-Rex 450's.
(I qualified that because it is the only size I have owned and worked on.)
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05-24-2007 10:45 PM  13 years ago
rwkracing

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malta.ny

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I oil my bearings for every day of fly and have 200 f on bearings no problem and bearings are cheap.why spend tons of time with grease and grease lubercates but adds drag,thats why rc race car drivers clean out the grease gain more top speed. .Just my 2 cents
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05-25-2007 01:06 AM  13 years ago
skydude

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Gainesville, Florida, USA

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hot esc
My esc has been too hot to touch from the inception. Shuts down after 2 to 3 minutes. The only thing that seems to have saved it is the temp sensored shut down.
I am working all kinds of angles. Align rce-bl25t.
Watch out all you moles!!! (Vae, puto deus fio)
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05-25-2007 01:47 AM  13 years ago
rwkracing

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malta.ny

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your lucky yours works my speedo smoked as iothers replace it with another brand
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05-25-2007 03:38 AM  13 years ago
Glorysgun

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Enterprise, AL

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I am working all kinds of angles. Align rce-bl25t
I have an XL that runs a tired old 430L and that esc. The esc gets hot but doesn't shut down. When I tried to stick a Medusa or a 430XL on that esc, I quickly get the intermittant power surge that should tell any operator with half a brain to cease work. The 25 amp can get too hot on a 450 3S setup if you have the wrong motor, mess too tight, or super bangin freak style flying. My other bird has a 35 amp that has run lots of different motors without ever getting warm. As with most align problems, simply throw more money at it and consider purchasing a new 35 amp'ish solution.
Katalepsis
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