Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

e-200 pylon racer - 3100 kv

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Old 09-20-2013, 06:18 AM
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oddy
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Default e-200 pylon racer - 3100 kv

Hello Everyone,

I took a 3100 kv engine (e-sky) from a helicopter and a 25a esc and mount it on a Quickie 200 with an APC 4.75x4.75......its great.

Anyhow Im having problems with the esc overheating,,,,,,is this prop too much for this engine (Or is it too small?)

Sorry for the basic question but Im fairly new to electric set ups....Ive flown pylon for long time but never electrics.

Thanks for your comments.
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Old 09-20-2013, 07:24 AM
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Insufficient data. I would guess you are using a 3s pack? If so my first guess is that with a 3100kV motor you could be pulling about 30 amps. If so you need to reduce prop load.

If you are now to electrics I would think you don't have a power meter.

Check out eCalc online.. put in the right motor and battery data and it will give you a good idea what is going on.

And of course make sure the controller gets enough cooling air.
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Old 09-20-2013, 08:09 AM
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Thanks a lot MJD,

Exactly Im using a 3s batteriy 35-70c

Which prop might take me to the propper Amp pulling in order to be able to use this 25A speed controller?

Thank you very much.
Víctor.
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Old 09-20-2013, 12:10 PM
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I don't know all the specs of that motor, so it is difficult for me to answer. If you cannot measure the current draw, then you might be guessing too. If you can find all the specifications for that motor, then eCalc can give you a good idea of the numbers.

http://www.ecalc.ch/motorcalc.htm?ecalc&lang=en

or you might prefer:

http://www.ecalc.ch/motorcalc.htm?ecalc&lang=es
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Old 09-22-2013, 03:37 PM
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get a APC glow prop for 1/2 engines. run the 5.7.3 or a APC 6x2 prop and cut it down to 5 " That motor isnt a good match for that plane. that plane although its a "racer" isnt very clean. you need a 5-7" prop to make it fast.
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Old 09-23-2013, 05:03 AM
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These are the specification of the engine I´m using

Color: purple
Motor weight: 40g
Motor length: 28mm
Motor diameter: 25.9mm
Shaft diameter: 2.3mm
KV: 3100RPM/V
Free load current: 2.5A
Max efficiency: 80%
Max current: 13A
Speed contorller requiement: 25A
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Old 09-23-2013, 10:57 AM
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yes with those specs you need more motor.
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Old 09-25-2013, 04:32 PM
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I wonder which would be hotter, the motor or speed controller.
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