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Old Jan 18, 2014, 06:24 AM
Fourdan is offline
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Antony (France)
Joined Sep 2003
3,271 Posts
Hi Phil
Same for me
I have tested a lot of motors
I am measuring Rm @ 20C, Io, rpmo no load (with Medusa rpm phase sensor and optical tach) for several voltages with several ESC (usually low timing 5-10deg)
Generally I find Kv higher than in the specs.
(using the formula Kv = rpm / (V - Rm Io)
It arrives exceptionnally that I find very close results.
My advice is for any hobbyist to check no load rpm when testing a new motor
Louis
PS
The V/rpm (generator mode) is a better way to compare two motors
Be careful with tach measurements (sometimes tach is giving false values)
Take several readings
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Old Jan 30, 2016, 05:36 AM
Mariete is online now
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Spain, Community of Madrid, Madrid
Joined May 2014
107 Posts
Hi.

Do you think two of the MT2814 810Kv should be good, in terms of efficiency, for a MyTwinDream, twin motor 1.8m airplane, weighting around 3-3.5Kg in 4S? http://www.rcgroups.com/forums/showt...light=Sunnysky

As a reference, looks like people are having good results with the Sunnysky 2814 800Kv.

I'm afraid if this will be short of power.
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