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  1. #1
    RC Competitor
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    Question KV what dose that mean

    so a tekin 2250 has more power than the 2650 am i right.
    .26 revo
    slash2wd&4w4
    summit
    embe
    2erbe

  2. #2
    RC Racer
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    May 2011
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    112
    yes it does
    rustler vxl
    erbe
    slash4x4
    ofna lx1 pro

  3. #3
    RC Competitor
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    thanks thats what i thought so all brushless are figured this way correct.
    .26 revo
    slash2wd&4w4
    summit
    embe
    2erbe

  4. #4
    RC Qualifier
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    May 2011
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    626
    4030 is for buggy 4038 is for truggy (<those are not kv rating)
    tekin recommends the 2650 for a buggy on 4s it would not be a good choice for the revo
    the 4038 2250kv is recommended for 4s
    you kinda have to match the kv to what batteriers you plan on running or your motor will overheat

  5. #5
    RC Competitor
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    right on thanks
    .26 revo
    slash2wd&4w4
    summit
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  6. #6
    RC Qualifier
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    Dec 2011
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    From Wikipedia :

    "Kv" is the motor velocity constant, measured in RPM per volt (not to be confused with "kV," the abbreviation for "kilovolt")

    The Kv rating of a brushless motor is the ratio of the motor's unloaded RPM to the peak (not RMS) voltage on the wires connected to the coils (the "back-EMF"). For example, a 5,700 Kv motor, supplied with 11.1 V, will run at a nominal 63,270 rpm (= 5700 * 11.1).

    By Lenz's law, a running motor will create a back-EMF proportional to the RPM. Once a motor is spinning so fast that the back-EMF is equal to the battery voltage (also called DC line voltage), it is impossible for the ESCs to "speed up" that motor, even with no load.
    So usually a lower KV rating means the motor has more torque but less RPM per Volt...

  7. #7
    RC Qualifier
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    Dec 2011
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    So technically the E Revo's 2200 KV motor will spin 48 840 rpm while running on 6S ( 22.2 volts )

  8. #8
    RC Champion
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    Mar 2005
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    2,559
    Higher kv alone does not necessarily indicate more power. Motor design, size, efficiency, gearing, etc all play very important roles in determining how much power a setup has.
    http://scriptasylum.com/rc_speed/

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