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Old Sep 01, 2010, 03:52 PM
nbi
Registered User
Joined Sep 2010
5 Posts
Question
Electronics problem. Engine smoking.

So I decided to start building an rc plane, I chose Izicraft as the model. But let's pass that, I got my electronics. Bought them from GiantCod

30A Speed Controller Pentium

M2226/25 1800kv MicroMotor 21g
1Kv (rpm/V): 1800
Power (W): 115
Wire Winds: 25
Resistance (mΩ): 657
Idle Current (A): 0.5
ESC (A): 10
Cells Ni-Cd/Ni-MH: 6-12
Cells Li-Po: 2-4
Prop: 8x4E
Weight: 21g


5C Loong max Tipple 1300 3S1P 25-35C Lipo Battery

Weight: 122g
Capacity: 1300mAh
Voltage: 3S1P (11.1v) 3 cell
Discharge Rate: 25-35C
Size: 67x35x23mm
Charge Plug: JST-XH



Im using E-fly 100b as a tx/rx. Got all connectors right. When I turned the engine on, it went for a while, (~5 secs), then I felt that smell of burned electronics. I checked all the links, tried again, this time the engine worked kind of weirder... and smoke came out of it. So i left it alone, and now I'm asking for your help.
Im using 8x43e slowfly GWS propeller.
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Old Sep 01, 2010, 05:41 PM
Air, Ground & Water
freechip's Avatar
Canada, ON, Rockland
Joined Aug 2008
24,104 Posts
Well if smoke came out of the motor then garbage it, smoke means the wires heated up to a point where the shielding on the windings could be damaged so the motor is not longer trust worthy.
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Old Sep 01, 2010, 05:53 PM
AMA #953123
VROOMSTER's Avatar
Eugene, ORYGUN
Joined Mar 2009
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I'm kinda new to all this too so I might be off, but that prop looks big for a motor with an 1800kv rating. Was there any prop data for the motor?
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Old Sep 01, 2010, 06:25 PM
nbi
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Joined Sep 2010
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recommended propeller for the motor is 8x4e
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Old Sep 01, 2010, 06:36 PM
ground penetration specialist
Nathan Schmoekel's Avatar
USA, MI, Grand Rapids
Joined Apr 2007
1,819 Posts
My guess is faulty insulation on the motor windings...contact the manufacturer or distributer and see if there is a known production issue. If your lucky, others were also unlucky, and made the same call.

I also would not continue to "test" the motor. If the windings are exposed and shorting, then you may dammage your ESC by continuing to run it.

Of course trouble shooting unseen issues via internet forums is sketchy at best
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Old Sep 01, 2010, 07:41 PM
Shelter Kitty "Orange Death"
bartricky's Avatar
United States, FL, Monroe
Joined Jan 2008
3,165 Posts
Im using 8x43e slowfly GWS propeller.

I'm with a too large prop on a small fast motor also.

8X4E might be OK with a 2S batt.

The 8x4.3 slowfly draws more current than the 8x4E prop
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Old Sep 01, 2010, 08:26 PM
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slowfly prop on an 1800kv motor = fire

thats about twice the typical rpm for a slow fly prop.
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Old Sep 01, 2010, 08:52 PM
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Nathan Schmoekel's Avatar
USA, MI, Grand Rapids
Joined Apr 2007
1,819 Posts
If you were at full throttle for more than, say maybe, 15 seconds when it started smoking- then I might be with the guys that are blaming the slow-fly prop. If not then I still like the faulty windings theroy.


A slow-fly prop actually has a lot more thrust for a given rpm than an "E" prop. The "E" type props are designed for high rpm motors moving higher speed planes like flying wings and pusher "jets".

While the motor may be "rated" for an 8x4 prop and a 3 cell battery. The slow fly prop would pull more amps and would probably have to be combined with a 2-cel battery to keep within the limits.

This is just one more shining example of why watt meter is such an important tool. With such a tool you would have known EXACTLY how many amps you were pulling when the motor smoked and you would know wether or not you exceeded the limits. OR better yet you would have ramped up slowly while watching said meter and would have realized things were being pushed too far.

At the end of the day the windings are still probably the fail point, the real question is- were they faulty or were they pushed past their design limits? We may never really know. When you order a new motor, add a watt meter to your shopping cart....it will save you money in the long run
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Old Sep 02, 2010, 06:56 AM
nbi
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Joined Sep 2010
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even without the prop, when i turn it on, it barely runs, slowly, then smoke comes out.
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Old Sep 02, 2010, 09:46 AM
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RogueTitan's Avatar
In Teh Garage (Rossville, GA. USA)
Joined Sep 2008
3,351 Posts
many possibilitys
the motor burned up due to an over sized prop or an over powered battery
or the motor was junk to begin with
always stay within specs
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Old Sep 02, 2010, 01:59 PM
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Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
20,936 Posts
I can guarantee the motor overamped with 3 cell use and cooked itself. That motor/prop combo is made to be used with 2 cell lipos. Due to the high KV rating, on 3 cells, you've probably doubled the amp draw with that prop, and cooked the motor.

Low end manufacturers tend to leave out info like this. Any experienced modeler would know to not use anything bigger than a 6x4E prop on that motor with 3 cells with that KV rating. Not sure how that motor can run on 4s, maybe with a small 4x4 prop.

Don't worry, it can happen to even the best of us.

Also, you need to put some shrink tubing over those bullet connectors....
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Old Sep 03, 2010, 07:35 AM
nbi
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Joined Sep 2010
5 Posts
Ok then. Please recommend me a motor from giantcod i could buy and be compatible with my baterry and prop.
Thanks.
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Old Sep 03, 2010, 11:49 AM
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Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
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You shouldn't have to use a 3S on that plane anyways. I would get the same motor and drop down to a 2s 1500 pack on the same prop. That will keep the plane light, and give you good solid flight times.
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Old Sep 03, 2010, 02:21 PM
nbi
Registered User
Joined Sep 2010
5 Posts
I really dont have more money to spend on other parts, i'm already out of budget, so, please, just recommend me one engine that has enough power for future projects and works with this battery, if not with the props too.

I've bought the gear from a forum recommendation from my country (rc plane models) and this is what I got. So hopefully I will get the proper engine now.

Thanks!

Edit:
Would this engine be ok?

Dimensiuni: diameter: 31mm, length: 62mm
Diameter ax(shaft): 3 mm
Weight: 59g
Randament maxim: 81%
KV: 1260
Recommended prop:
LiPo 2s: 11x3.8 - 12x8, tractiune 420 - 450 g, consum intre 7.5 - 9.5 A
LiPo 3s: 9x3.8 - 10x7, tractiune 480 - 650 g, consum intre 8 - 12 A
Tensiune: 7.2 - 12.6 V
Curent de mers in gol: 0.7A
Curent maxim: 12A

OR

Motor FC2812 Brushless Outrunner 1534kv

Specifications
Mass: 39 grame
Diameter ax(shaft): 3 mm
Dimensions - length: 46 mm
- diametru: 28 mm
- stator: 22x10 mm
Recommended prop: 7x7 sau 7x6 inch
Tensiune de lucru: 3 sau 4 celule LiPo
Kv: 1534 RPM/V

I need more traction power, so this is what they recommend in the product specs

Prop 7x6 SF:
- RPM: 11000
- Current maxim: 15.5 A
- Max weight of plane: 730 grams

Thanks!
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Last edited by nbi; Sep 03, 2010 at 03:57 PM.
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