Combat Electric combat discussion in here.

Burning ESC- Help Please

Old 06-09-2010, 06:18 PM
  #1  
shepard62
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Unhappy Burning ESC- Help Please

I burned up 2 ESC's (one was still on the bench). Here is the set up and I am told this set up is used by some guys.

DX6i
6200 receiver
(two) 2200mah 3cell 20C - hooked together in series
Turnigy 35-30-1100kv
Turnigy Plush 40A ESC

The ESC failed as soon as the throttle was advanced( only about 25-50%). I have checked to ensure the "series " is wired correctly.

Any one care to point me in the right direction.?


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Old 06-09-2010, 07:16 PM
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Cdr. Instigator
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I don't think a 40Amp ESC can handle 2.. 3S of any kind.. Drop 1 of them..
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Old 06-09-2010, 08:00 PM
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dditch66
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I don't think a 40Amp ESC can handle 2.. 3S of any kind.. Drop 1 of them..
Why do you say that? Plush 40A is designed for 6S. Plus with his combat prop (8x3) and 1100Kv motor, he's not pulling that many amps for the total wattage.

With that motor running an 8x3 combat prop, that should pull like 16-18A. So the 40A should be ok. I used a Volcano 40A Opto in mine with a seperate BEC. You may want to post to the RC groups combat section if not the RCCA forum. Lee Liddle monitors both and could help. I will have the same setup in my eFalcon, but I"ve yet to even start my build. Got the kit last night.

I ran a Volcano 40A w/ Opto and switching BEC (switching BEC hooked up to lower 3S only).

Is this the ESC you have?
http://www.hobbycity.com/hobbyking/s...idProduct=2165
I ask because, the specs show Linear but The 40A Plush is supposed to have a switching BEC (Yours has the donut shaped filter at the end of the servo connection?). The instructions that came with it says 40A is switching.

One way to tell if it's linear is when you hook it up and wiggle the servos around for a while, does the ESC get hot (not running motor), If so, it's Linear, if not, it's probably switching.
If I were you I'd get a 3A hobbywing or turnigy switching BEC and try that. For anything over 3S, I don't like to use the ESC's BEC, even if it says linear.
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Old 06-10-2010, 12:42 AM
  #4  
shepard62
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Yes that is the ESC that burned up. I am going to use a 60Amp and try an 80 A as well. I am trying to get ready for the Street ,MD contest. I saw that you signed up.

What RPM's are you getting?

Did you have 17,500 when you flew at Laurel?

Thanks for your help
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Old 06-10-2010, 01:14 AM
  #5  
tobydogs
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35-30-1100kv turnigy =345watts..........you said your running 2 3cell packs in series that motor can't handle 6 cells.........

Capitan ,I'm given her all she's got ....she burning up her dilithium esc...err..crystals.

35-30-1100 is 3 cell rated,did you mean your running them in parallel?
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Old 06-10-2010, 01:56 AM
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dditch66
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He's running it in series. He has to get at least 17,500 RPM. You don't always have to follow motor cell count ratings. Wattage rating is the key. That 8x3 prop does not load the motor more than about 16-18A at 17,500RPM. This motor is already being used by SSC pilots down in Tx on 6S. I used a Hobbypartz Monsterpower 15 on 6S in the last contest (3 of us did). They blew ESC's only on 2 of the 5 prop impact mid-airs we had.

Now, he could have a faulty motor. I may end up eating my own words in a the next day cause I'm using the same motor on 6S for my new combat setup also.
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Old 06-10-2010, 02:29 AM
  #7  
tobydogs
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alright then,i shouldn't joke about something i don't understand but it sounds very fast! what is "ssc"? something combat? the 17500 rpms with a 8x3 prop must scream thru the air.
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Old 06-13-2010, 03:17 PM
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shepard62
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I am Still working on these combat planes (weird looking) . Any cheap ESC's out there?
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Old 06-13-2010, 03:49 PM
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Originally Posted by stuart View Post
alright then,i shouldn't joke about something i don't understand but it sounds very fast! what is "ssc"? something combat? the 17500 rpms with a 8x3 prop must scream thru the air.
Slow Survivable Combat

http://rccombat.net/forum/viewforum....9fbf4749d3de9b
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Old 06-13-2010, 04:12 PM
  #10  
tobydogs
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thanks James, i guess it's still pretty fast fun even tho called slow.....the only combat i watched was very funny and super fast. 5 delta type wing screaming around the sky trying to hit each other ,impacts would damage as expected....but the winner was the last wing flying which meant running the lipos very low,some just drop out due to battery.

i will say the action was way to fast for me to consider as the spectators must be considered as your chasing planes in the air...
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Old 06-13-2010, 04:23 PM
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Dane McGee
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Originally Posted by shepard62 View Post
I am Still working on these combat planes (weird looking) . Any cheap ESC's out there?
.........Hobby King SS brand esc 40-50 amp $11.00, ............then Plush 40 esc for $21.00 or so and the Turnigy Sentry for about the same price.

Is that a Texas Flugwerks Kit? I've never seen an engine mount stick out so far forward..........or is the wing just sitting back unattached?

If you are having trouble getting it to balance gimme a shout back.......I have a couple of ideas.

Last edited by Dane McGee; 06-13-2010 at 04:40 PM.
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Old 06-13-2010, 05:07 PM
  #12  
Larry3215
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If the same motor keeps burning up esc's, then I would check the motor very carefully for shorts or opens or a bad connection/connector in one of the windings.

If one phase has a short or open or even just a slightly higher resistance compared to the other phases it will cause the esc to get super hot at a minimum and can burn them up in seconds.

It may also be binding or have a magnet thats slipped etc or one phase may be wound incorrectly from the factory.

With the next esc, I would test it on a known good motor first before trying to run this motor again. You could also risk a known good esc to see if it will run this motor - its a risk though.
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Old 06-14-2010, 07:22 AM
  #13  
shepard62
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Hey Dane , I sent you a private message.
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Old 06-14-2010, 09:19 PM
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Dane McGee
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.........sorry didn't get it.
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Old 06-14-2010, 09:55 PM
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Originally Posted by shepard62 View Post
I burned up 2 ESC's (one was still on the bench). Here is the set up and I am told this set up is used by some guys.

DX6i
6200 receiver
(two) 2200mah 3cell 20C - hooked together in series
Turnigy 35-30-1100kv
Turnigy Plush 40A ESC

The ESC failed as soon as the throttle was advanced( only about 25-50%). I have checked to ensure the "series " is wired correctly.

Any one care to point me in the right direction.?


Have you checked the current pulled by your setup with a wattmeter? Running the numbers through www.motocalc.com suggests that your setup will be pulling some 400 or 500 watts to turn an 8X3 at 17,500 RPM. Motocalc also indicates that this motor will be running extremely hot with that sort of power input. (I get uncomfortable with any motor running over 100 Watts per ounce of motor weight. This one is some 150 Watts/ounce.)

Also, what failed, the power circuits that drive the motor? or the 5 volt regulator that drives your receiver and servos?
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Old 06-14-2010, 10:43 PM
  #16  
Bub Steve
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Maybe you should'nt go with a 6-cell set-up that puts out 22.2V,,, are you sure they not soppose to be in parrallel ate 11.1?? six cells and a 40amp ESC dosn't sound right, bubsteve
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Old 06-14-2010, 11:39 PM
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shepard62
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Originally Posted by Dane McGee View Post
.........Hobby King SS brand esc 40-50 amp $11.00, ............then Plush 40 esc for $21.00 or so and the Turnigy Sentry for about the same price.

Is that a Texas Flugwerks Kit? I've never seen an engine mount stick out so far forward..........or is the wing just sitting back unattached?

If you are having trouble getting it to balance gimme a shout back.......I have a couple of ideas.
Battle Axe wing on a Texas FW motor stick. Just for the photo (unattached).
Both wings fly great, with a slight advantage to the Texas FW wing. Balance is OK. Flying one with no elevator which is a bit tricky and will snap if I give it hard elevator.

Bill

PS: This plane has a Texas FW wing.
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Last edited by shepard62; 06-15-2010 at 12:20 AM.
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Old 06-15-2010, 01:43 AM
  #18  
Dane McGee
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Originally Posted by shepard62 View Post
l............ is a bit tricky and will snap if I give it hard elevator.

Bill
Yep with elevons cg has to be right on ..........and too much elevator will snap um. Dial down elev on high rates till no snap then dial down an additional 15% for low rates.
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