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11-30-2007 08:49 PM  9 years agoPost 1
eltavito

rrNovice

Goldsboro, NC

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Hello,
Does anyone have any experience dealing with kontronik from the US?
My Kora 15-12 motor just burned out and its still under warranty.

Occy

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11-30-2007 09:41 PM  9 years agoPost 2
mr2rbo

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Virginia

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Sorry but I don't have any experience with this company. I'm guessing they should take care of you without any problems given their product pricing. How did you burn up your motor. I just got a Kora 15-14 today.

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12-01-2007 01:06 AM  9 years agoPost 3
Tday

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Needham, MA

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I've burned out two 15-12's on 5s...not that many flights either. Supposedly a 2 year warranty, right? Let me know what you find out. Tom

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12-01-2007 01:13 AM  9 years agoPost 4
xurifle06

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Glocester, RI

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You might want to be carefull with the 15-12 on 5s. On the Kontronik website it says the 15-12 is rated for 2-4s lipo. Im running a 15-14 (rated 2-5s lipo) on my lepton with 5s and its perfect with a 21t pinon.

Rich

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12-01-2007 01:28 AM  9 years agoPost 5
Dr.Don

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Cedar Park, TX -- USA

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These guys are the service/support organization for Kontronic in North America:
http://www.icare-rc.com/

Their service request form is here:
http://www.icare-rc.com/document/Se...0RMA%20Form.pdf

Be prepared to wait a while...significant repairs they ship back to Germany. It took several weeks on mine, but eventually came through fine.

Dr.Don

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12-01-2007 02:16 PM  9 years agoPost 6
eltavito

rrNovice

Goldsboro, NC

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I was doing a lot of tic tocs in the span of about 4 minutes and all of a sudden I lost power and did an auto, it was the motor.
The manual for the 15-12 says the motor is rated for 3-5 lithium batteries and a constant power input of 600 w. with the tic tocs I was getting momentary spikes of 900w but not constant, so I think the motor should have handled this according to the manual.

Tday did you start using diferent motors?

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12-01-2007 02:39 PM  9 years agoPost 7
Tday

rrKey Veteran

Needham, MA

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I was at 4s with a hyperion...then moved up to 5s. I read all the motor reviews and the 15-12 and 15-14 by kontronics looked the best. It seemed like a toss up to me between them, but I didn't see other 5s's that were this light and in the right kv band. Nice motor when it's working. I don't have any idea what the watts output was, but one burned out with continuous rolls. That I could understand since it got a little hot though not crazy. I had another burn out with just ordinary but hard 3d flying.

Tom

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12-01-2007 03:52 PM  9 years agoPost 8
eltavito

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Goldsboro, NC

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What motor are you flying on the Lepton currently?

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12-01-2007 03:59 PM  9 years agoPost 9
eltavito

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Goldsboro, NC

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I'm thinking of giving the 15-14 a try while the 15-12 gets repaired.

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12-01-2007 08:48 PM  9 years agoPost 10
Tday

rrKey Veteran

Needham, MA

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I am still using a 15-12, actually...I'd like to hear more about the 15-14...especially around longevity, where that's defined as lasting more than 50 flights, say. I didn't give it a thought for the first 2 burn outs...figured I'm new to electrics and maybe that's the deal. Also had a 4s motor throw a magnet, so it didn't seem that out of line with that experience, though not what I was wanting. I also couldn't figure out if the Align esc I was using contributed to the problems. (You can see I know nothing about these electrics...but I do love the way the lepton flies!) Tom PS: am getting ready to try out a 6s logo 5...so if I'm lost now...wait!)

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12-02-2007 12:29 AM  9 years agoPost 11
Jafa

rrElite Veteran

Sydney, Australia

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The Kora 15-XX range have a max rpm of 15,000

On a freshly charged 5S pack the Kora 15-12 will be 1,000 rpm
over this rated maximum - this may be a factor in the failures

Even when you drop down to a nominal 5S voltage
you're within 600 rpm of the limit

But you certainly do want to rev them well
as they produce more power with RPM


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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12-14-2007 06:00 PM  9 years agoPost 12
IDHoverman

rrApprentice

Jakarta-Indonesia

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Overgearing any electric motor will also result in a premature burn. What pinion number is being used for the 15-12 and 15-14? The original Hirobo 24 and 26 teeth pinion is too high.

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12-15-2007 03:56 AM  9 years agoPost 13
eltavito

rrNovice

Goldsboro, NC

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I was using an 18t pinion w/ the 15-12

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12-15-2007 06:11 PM  9 years agoPost 14
Crome ball

rrNovice

NJ

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17 t pinion w/ 15-12/. good enough for me, not a 3d pilot just enjoying hover at the moment.

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04-24-2008 05:40 AM  9 years agoPost 15
balbs

rrKey Veteran

Los Angeles, CA

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Can you guys confirm the warranty on the Kora 15-12? Is it really 2 years? I think mine burned out...out of the box actually. On the bench it seemed to work fine, but when on load (hover testing) it would cut out after 30 seconds. I tested the rest of the electronics with a different motor and it worked fine so the problem is the motor.

Balbs

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